IEC YEAR 3 FINALEXAM 2024-2025, Exams of Nursing

Download IEC YEAR 3 FINALEXAM 2024-2025 and more Exams Nursing in PDF only on Docsity! 1 | P a g e IEC YEAR 3 FINAL EXAM 2024-2025 WITH ACTUAL CORRECT QUESTIONS AND VERIFIED DETAILED ANSWERS |FREQUENTLY TESTED QUESTIONS AND SOLUTIONS |ALREADY GRADED A+|NEWEST|GUARANTEED PASS|LATEST UPDATE A CATV network may utilize a head-end to provide pre-recorded information. This information can be sent over a specific channel of the MATV system. __ are typical for an MATV system. Select one: a. Universities b. Large hotels c. Dormitories d. all of these all of these From the head-end of the CCTV system, ___. Select one: a. cables are installed to uniquely identify each camera b. one cable is installed to the nearest camera and continues to the remaining cameras c. both a and b cables are installed to uniquely identify each camera A ___ system is used for surveillance and/or recorded documentation. Select one: a. MATV b. CATV c. CCTV d. any of these CCTV 2 | P a g e An audio system network can be utilized to provide __. Select one: a. paging b. emergency notification c. background music d. any of these any of these Audio systems can utilize __ cables. Select one: a. CMR| b. CMG c. CMP d. any of these any of these Cat ___ UTP cables are used for LANs. I. 6 II. 3 III. 5E Select one: a. I only b. I or II only c. I, II, or III d. II only e. I or III only 6 or 5E The pairs in CAT ___ UTP cables have the least amount of twist. Select one: a. 6 b. 5E c. 3 3 Cat 3, 5E, and 6 UTP cables contain ___. Select one: a. 22- to 24-gauge copper wire b. twisted pairs of wire c. unshielded wire d. all of these 5 | P a g e a. copper b. aluminum c. either a or b aluminum A commonly used type of coaxial cable used for video application is ___. Select one: a. RG11/U b. RG59/U c. RG6/U d. all of these All of these CATV coax cable is terminated with Type ___ connectors. Select one: a. BNC b. F c. either a or b F The maximum length limitation for RG-6 cable is ___ feet. Select one: a. 500 b. 1000 c. 750 d. 330 750 The maximum length for RG-11 cable is ___ feet. Select one: a. 500 b. 1000 c. 750 d. 330 1000 When installing coaxial cable, the tension applied when pulling can not exceed ___ pounds. Select one: a. 8 6 | P a g e b. 25 c. 70 d. 90 90 After the termination of coaxial cable is complete, there should be ___ between the shielding and the center conductor. Select one: a. continuity b. insulation insulation When installing coaxial cable, __ end(s) shall be labeled. Select one: a. either b. both both Generally, __ cable has a higher bandwidth and can transmit larger amounts of data. Select one: a. copper b. fiber optic fiber optic An optical fiber cable transmits ___. Select one: a. photons b. electrons photons ___ cable is more secure against eavesdropping because the cable must be physically tapped to do so. Select one: a. Copper b. Fiber optic Fiber optic The installation costs for ___ cables is less. Select one: 7 | P a g e a. copper b. fiber optic copper ___ cable will not pick electric noise or generate electromagnetic radiation that may interfere with other signals. Select one: a. Copper b. Fiber optic Fiber optic The core of optical fiber cable is covered with ___. Select one: a. cladding b. a shield cladding The ___ of optical fiber cable reflects the light throughout the length of cable. Select one: a. cladding b. core core The minimum bending radius for fiber optical cable is ___ inches. Select one: a. 6 b. 12 c. 8 d. according to manufacturer specifications according to manufacturer specifications Which of these fiber optical can transmit light the greatest distance? Select one: a. multi-mode step index fiber b. single-mode step index fiber c. multi-mode graded index fiber single-mode step index fiber 10 | P a g e c. within 72 hours d. within 24 hours immediately The OSHA regulations set the minimum lighting level for different areas on constructions sites. These levels are dependant upon the task being performed in the area. For example, ___ foot candles are required in an area used for offices than the number that would be required for storage. Select one: a. more b. less more Where construction work is in progress, OSHA requires areas, aisles, stairs , ramps, runways, corridors, offices, shops, and storage areas to be lighted. Select one: a. True b. False True Free-standing temporary light stands ___ permitted to be used on construction sites. Select one: a. are not b. are are Temporary electric splices are to be insulted and inaccessible. When these splices are more than ___ feet above the floor, they are considered to be inaccessible. Select one: a. 16 b. 8 c. 12 d. 10 e. 6 1/2 8 During the period of construction, ___ foot candles are required in electrical equipment rooms. Select one: a. 3 b. 30 11 | P a g e c. 5 d. 10 e. 12 10 To provide convenience receptacles and lighting for temporary construction sites, a minimum of __ circuits are required. Select one: a. two b. one c. three d. five two A dual-voltage motor could be a __ motor. Select one: a. 120- or 240-volt, 1Φ b. 240- or 480-volt, 1Φ c. 240- or 480-volt, 3Φ d. any of these any of these When a dual-voltage motor is connected to a high-voltage circuit, the __ current is less than it would be if connected to a low voltage circuit. Select one: a. line b. winding c. both a & b line A dual-voltage motor was connected to a low-voltage circuit. Later, the circuit was replaced with a high- voltage circuit. After the motor was reconnected to the circuit, the line current ___. Select one: a. has not changed b. is now lower c. is now high is now lower A dual-voltage motor was connected to a low voltage circuit. Later, the circuit was replaced with a high- voltage circuit. After the motor was reconnected to the circuit, the current through each motor winding 12 | P a g e ___. Select one: a. has not changed b. is now lower c. is now higher has not changed The windings of 230/460-volt, dual-voltage, wye-wound motors are connected in ___ when the supply circuit is 480 volts. Select one: a. series b. parallel series Correct rotation of a 3-phase motor will always be achieved if AΦ is connected to T1, BΦ is connected to T2, and CΦ is connected to T3. Select one: a. True b. False False Dual-voltage, wye-wound, 9lead motors ___ be field-connected in delta. Select one: a. can b. cannot cannot Nine-lead 3Φ motors are usually internally (factory) connected as either a ___ configuration. Select one: a. series or parallel b. delta or wye c. start or stop d. torque or wound delta or wye All solvent waste, oily rags, and ___ shall be kept in a fire-resistant covered containers until removed from the worksite. Select one: 15 | P a g e Maximum safe load limits of floors within building and structures, in pounds per square foot, shall be ___. Select one: a. recorded in the HazCom Manual b. conspicuously posted c. measured daily conspicuously posted OSHA regualtion CFR1926.250 covers materials handling ___. I. storage II. use III. disposal Select one: a. I only b. I, II & III c. III only d. II only Storage, use & disposal A manual reversing starter is an assembly that includes ___ and a mechanical interlock. I. 2 contactors II. 2 OL sections III. 1 contactor IV. 1 OL section Select one: a. I & II b. II & III c. I & IV d. III & IV 2 contactors, 1 OL section A manual reversing starter requires ___ OL section(s). Select one: a. one b. two two Internal drum switch connections are made between terminals 5 and 6 when the switch is in the ___ position. Select one: a. Forward b. Reverse 16 | P a g e c. both a and b d. neither a nor b Forward and Reverse The control switching for a reversing starter can consist of ___. Select one: a. a stop PB, a start PB, and a forward/reverse selector switch b. a stop PB, a forward PB, and a reverse PB c. either a or b d. neither either a or b Highway construction fatalities rarely include instances of workers being struck by moving vehicles. Select one: a. True b. False False Between 2003-2017 there were ____ deaths in highway construction in the U.S. Select one: a. 1,311 b. 66,690 c. 131,300 d. 1,844 1,844 Over a period of recent years, there has been a(n) __ in the number of highway construction projects. Select one: a. decrease b. increase increase On road construction projects, flaggers must wear vests that are ___ any barricades. Select one: a. the same color as b. a different color than a different color than 17 | P a g e When the public drives past a highway construction project, these drivers pose no danger to the construction workers. Select one: a. True b. False False Highway safety data indicated that roadway construction workers are killed at a rate nearly ___ times the rate of other forms of construction. Select one: a. twelve b. three c. twenty d. one hundred three ___ is the starting of a motor for short periods of time and is generally used for positioning of a driven load. Select one: a. plugging b. sequencing c. braking d. jogging jogging phase unbalance in a three-phase system causes __. Select one: a. phase shifting b. overheated motors c. both a and b d. neither a nor b phase shifting and overheated motors in a three-phase system, a voltage unbalance greater than __ from the average voltage should be investigated. Select one: a. 7.2 percent b. 2 percent 20 | P a g e b. CMG c. CMP d. any of these any of these CCTV coax cable is constructed with a(n) ___ shield Select one: a. copper b. aluminum c. either a or b aluminum Because it provides less signal loss, quad-shield coaxial cable is used for ___ TV signals. Select one: a. analog b. digital digital Compared to crimp-on BNC coaxial cable connectors, screw-on BNC connectors permit a ___ signal loss. Select one: a. high b. lower higher The maximum length limitation for RG-69 cable is ___ feet. Select one: a. 500 b. 1000 c. 750 d. 330 500 Cat 3, 5E, and 6 UTP cables used for ___ contain stranded conductors. Select one: a. patch cords b. local area networks patch cords 21 | P a g e When terminating UTP cables, the order of placement of the wires is ___. Select one: a. dependent upon the termination device b. not important dependent upon the termination devices A copper cable transmits __. Select one: a. photons b. electrons electrons Optical fiber cable is permitted to be installed ___. Select one: a. as direct burial cable b. underground in conduit c. as an aerial cable} d. indoors e. any of these any of these Fiber optic cables can be terminated with __ connectors. Select one: a. ST b. LC c. FC d. any of these any of these You ___ react to any sudfden and/or unexpected movements of drivers near you. Select one: a. should b. should not should To minimize injury hazards while driving, you should ___. Select one: a. wear safety belts 22 | P a g e b. secure loose items c. both a and b wear safety belts and secure loose items Driving speeds should be ___. I. below the legal maximum II. above the legal minimum III. appropriate for the road conditions below the legal maximum and appropriate for the road conditions Which of the following can positively affect your driving safety? Select one: a. properly functioning wipers b. properly inflated tires c. the use of headlights d. the use of seatbelts e. all of these all of these Highway fatalities represent more than ___% of all transportation related fatalities. Select one: a. 60 b. 90 c. 40 d. 25 90% In 2019, there were more than ___ fatalities on our highways in the U.S. Select one: a. 2.5 million b. 5 million c. 36 thousand d. 250 thousand 36 thousands Impaired driving can be caused by __. Select one: a. lack of sleep or fatigue b. any of these c. consumption of alcohol 25 | P a g e Select one: a. his temperature under control b. blood flowing to his vital organs c. both a and b d. neither a nor b both, "his temperature under control" and "blood flowing to his vital organs" Symptoms of heat stoke include ___. Select one: a. lack of sweating b. irrational behavior c. hot, dry skin d. identification of potential risks e. all of these all of these For Voice/Data/Video network projects, the electrical contractor should __. Select one: a. determine if he is to install and terminate the cabling b. determine if the network is to be powered by a 120-Vac circuit c. understand his responsibilities for the successful completion of the project d. determine if the work is to be performed under his construction permit e. all of these all of these Typical VDV networks include those provided for ___ systems. Select one: a. audio b. CATB c. telephone d. video e. all of these all of these Components of a basic network include ___. Select one: a. devices b. a head-end c. cable 26 | P a g e d. a public provider e. all of these all of these A computer network can be __. Select one: a. hardwired b. wireless c. either a or b d. neither a nor b either a or b When used for a business facility's computer network, the MDF may ___. Select one: a. be the primary connection point for the internet provider b. contain the client servers c. be connected to an IDF for large systems d. any of these any of these Which of the following is an example of a load? I. Relay Coil II. Solenoid III. Pilot Light Select one: a. I, II & III b. I only c. III only d. I & II only e. II only a. I, II & III A qualified person must be trained in the skills and techniques to determine nominal voltage. Select one: a.True b.False a. true 27 | P a g e A(n) ___ uses voltages in the range of 50 to 5000 volts to test for insulation damage to conductors or windings. Select one: a.megohmmeter b.ammeter c.oscilloscope d.none of these a. megohmmeter The training section of an electrical safety program identifies all training required for contractors and vendors. Select one: a.True b.False a. true A(n) ___ is a noncontact temperature probe that senses the infrared energy emitted by a material. Select one: a.ground resistance tester b.digital logic probe c.infrared temperature probe d.optical time domain reflectometer c. infrared temperature probe Transient voltages occur due to ___. Select one: a.unfiltered electrical equipment b.power switching, ON and OFF c.lightning strikes d.all of these d. all of these Before removing a fuse, the circuit should be de-energized. Select one: a.True b.False a. true 30 | P a g e c.I & III only d.I, II & III d. I, II & III One of the most important goals of the Multi-Employer Worksite Policy from OSHA is to ensure that ___. Select one: a.Good communication occurs between the contractors working on the site b.Every contractor on the worksite receives a citation c.Only the contractor responsible receives a citation d.The General Contractor will enforce safety on the worksite a. Good communication occurs between the contractors working on the site An electrical safety program should include a section on ___. Select one: a.Responsibility b.Procedures c.Principles d.All of the above d. all of the above A written, documented electrical safety program is ___ than a verbal one. Select one: a.More effective b.Less effective c.Just as effective a. more effective The primary method required by OSHA for protecting qualified electrical workers from electrical hazards is ___. Select one: a.Equipment shutdown b.Lockout/tagout c.Posting signs d.Using appropriate PPE b. lockout/tagout The ___ step is probably the most important step in a lockout/tagout procedure. Select one: 31 | P a g e a.Isolate the power source b.Place a lock and tag c.Apply a ground to drain off the residual energy d.Test for the absence of voltage d. test for the absence of voltage It is not required to verify that a circuit or equipment has been de-energized as long as all of the other steps of the lockout/tagout procedure have been performed. Select one: a.True b.False b. false Which of the following devices is not recommended for performing absence of voltage tests? Select one: a.Noncontact voltage tester b.Solenoid voltage tester c.Digital multimeter d.High input impedance contact voltage tester a. noncontact voltage tester An arc flash hazard analysis is used to determine ___. Select one: a.Potential electrical arc flash hazards b.The Arc Flash Boundary c.The required PPE d.All of the above d. all of the above The ___ is the distance from exposed energized conductors or circuit parts where bare skin would receive the equivalent of 1.2 cal/cm2. Select one: a.Arc Flash Boundary b.Limited Approach Boundary c.Prohibited Approach Boundary d.Restricted Approach Boundary a. arc flash boundary The Approach boundaries are viewed as a barrier extending ___ degrees around an exposed energized conductor or circuit part. 32 | P a g e Select one: a.90 b.180 c.270 d.360 d. 360 OSHA standards state that electrical equipment must be ___ before preventative maintenance or service is to be performed. I. locked out II. tagged out Select one: a.I only b.II only c.both I & II d.neither I nor II c. both I & II Lockout is the process of installing ___. Select one: a.an information tag on a manual starter b.red tape on a circuit breaker c.a padlock on a safety switch d.any of these c. a padlock on a safety switch NFPA 70E states that only qualified persons shall perform testing work on or near live parts operating at ___ volts or more. Select one: a.300 b.150 c.30 d.120 e.50 e. 50 When performing certain operations on or near energized equipment or circuits, approved ___ clothing must be worn for protection from electrical arcs. Select one: a.arc-rated 35 | P a g e c.grounded conductor d.grounding electrode conductor b. main bonding jumper The definition of an equipment grounding conductor in the NEC® generally covers many different concepts and parts of a grounding system. Select one: a.True b.False a. true A circuit is installed in EMT and compression fittings are used. A separate EGC is NOT installed in the conduit. If a ground fault occurs and one or more couplings were never tightened properly, compared to normal operation, the fault current will be ___ and the OCPD will take ___ time to open. Select one: a.lower the same b.higher more c.higher less d.lower more e.lower less d. lower more An effective ground-fault current path has ___.I. continuity II. sufficient ampacity III. low impedance Select one: a.I, II & III b.I only c.III only d.II & III only e.I & II only f.I & III only a. I, II & III As circuit resistance ___, the time it takes for an OCPD to operate increases. Select one: a.increases b.decreases a. increases 36 | P a g e Which of the following are considered to be current-carrying conductors?I. neutral conductor II. ungrounded conductor III. grounding conductor Select one: a.I & II only b.II & III only c.II only d.I, II & III e.I only a. I & II only A ___ is used to connect the grounding electrode to the equipment or to the grounded conductor at the service equipment. Select one: a.grounded conductor b.grounding electrode conductor c.main bonding jumper d.main breaker b. grounding electrode conductor The ___ is the connection between the grounded circuit conductor and the equipment grounding conductor at the service. Select one: a.grounding electrode conductor b.main bonding jumper c.grounded service conductor d.grounding electrode b. main bonding jumper A(n) ___ conductor carries circuit current in normal operation. Select one: a.equipment grounding b.grounding electrode c.neutral d.none of these c. neutral Which of the following is not an example of a solidly grounded system? Select one: a.120/208-volt, three-phase, four-wire 37 | P a g e b.120/240-volt, three-phase, four-wire c.120/240-volt, single-phase, three-wire d.480-volt, three-phase, three-wire d. 480-volt, three phase, three wire A solidly grounded system is one where one of the current-carrying conductors is intentionally connected to the earth. Select one: a.True b.False a. true Ground is the ___. Select one: a.earth b.metallic components of a building structure c.accidental contact made between two ungrounded circuit conductors d.intentional connection point between grounded and grounding conductors a. earth In order to establish an effective ground-fault current path, impedance must be ___. Select one: a.multi-phase b.low c.reciprocal d.high b. low In Figure 303.05, the equipment grounding conductor is shown at Point ___. Select one: a.IV b.III c.II d.I b. III In Figure 303.05, the grounded conductor is shown at Point ___. Select one: a.IV 40 | P a g e conductor touching a grounding conductor Select one: a.I only b.II only c.I & II only d.II & III only e.I, II & III e. I, II & III An overload occurs when an electrical conductor or equipment is operated in excess of its current rating. Select one: a.True b.False a. true When ___ touch together, this is a ground fault. Select one: a.two ungrounded circuit conductors b.an ungrounded and a grounded circuit conductor c.an ungrounded circuit conductor and the metal conduit d.a or b only e.a, or b, or c c. an underground circuit conductor and the metal conduit The primary purpose of grounding metal equipment enclosures and metal raceways to the grounding electrode system (earth) is to ___.I. cause the quick operation of OCPDsII. keep all metal parts at the same voltageIII. limit voltage surges Select one: a.I, II & III b.I & III only c.II & III only d.I only e.I & II only c. II & III only Proper equipment grounding eliminates voltage that might cause an electric shock by ___. Select one: a.eliminating potential differences between metal electrical enclosures 41 | P a g e b.establishing an electrical potential between metallic electrical enclosures c.eliminating any current flow in the circuit d.raising the alternating current impedance a. eliminating potential differences between metal electrical enclosures Which of the following statements does NOT describe objectionable current? Select one: a.Neutral current flowing over the neutral conductor b.Neutral current flowing over the equipment grounding conductor c.Neutral current flowing over cable shields d.Neutral current flowing over metal conduit a. Neutral current flowing over the neutral conductor In general, the connection means for equipment bonding jumpers and electrical grounding conductors are the same. Section 250.8 permits the equipment bonding jumper connection to be made by all of the following means, except for ___. Select one: a.exothermic welding b.sheet metal screws c.listed pressure connections d.listed clamps b. sheet metal screws How does grounding prevent an electrical fault? Select one: a.Grounding protects the "line side" of the circuit. b.Grounding protects the "load side" of the circuit. c.Grounding reduces potential difference. d.Grounding cannot prevent an electrical fault. d. Grounding cannot prevent an electrical fault. The primary purpose of bonding metal equipment enclosures, metal raceways, and the grounded power supply together is to ___.I. cause the quick operation of OCPDsII. keep all metal parts at the same voltageIII. limit voltage surges Select one: a.I, II & III b.I & III only c.II & III only d.I only e.I & II only 42 | P a g e d. I only A ground rod is the only grounding electrode at a service. If the GEC becomes loose when connected to the rod, the branch-circuit breakers in the service panel will take ___ amount of time to open if a ground fault occurs in one of the branch circuits. Select one: a.a longer b.a shorter c.the same c. the same All of the following are considered a short circuit, except for ___. Select one: a.line-to-line fault b.phase-to-phase fault c.neutral-to-ground fault d.phase-to-neutral fault d. phase-to-neutral fault You should observe "no smoking" areas near any flammable materials. Select one: a.True b.False a. true Never carry heavy objects when climbing a ladder. Select one: a.True b.False a. true If your power tool has auxiliary handles, they must be used to keep the tool in your grip. Select one: a.True b.False a. true You should be aware of hazards created by other trades working near you. 45 | P a g e When a 3Ø, 4-W supply system delivers 120/208 volts, the system has a neutral. Select one: a.True b.False a. true In a 277/480-volt, 3-phase, 4-wire system, the maximum voltage to ground is ___. Select one: a.208 volts b.240 volts c.277 volts d.120 volts c. 277 volts Three 120-volt circuits will be installed to serve receptacles that are required to be GFCI protected. The three circuits will be installed in one conduit to a J-box, and then MC cable will be run from there to the receptacles. Three GFCI circuit breakers will be installed in a 120/208-volt, 3-phase, 4-wire panelboard. The fewest number of neutrals that can be installed in the conduit is ___. Select one: a.two b.three c.one b. three In a 480-volt, corner-grounded delta system, the maximum voltage to ground is ___. Select one: a.208 volts b.480 volts c.277 volts d.240 volts b. 480 volts When a 3Ø, 4-W supply system delivers 277/480 volts, the system has a neutral. Select one: a.True b.False a. true 46 | P a g e NEC® Sections 250.20, 250.21, and 250.22 state when a system is required, permitted, or not permitted to be grounded. Which of these transformer secondaries is required to be grounded?I. 120 to 12 volt AC transformer installed outside overhead to tree-mounted, low-voltage lightingII. 480 to 120/240 VAC, 1Ø, 3-wire to a panelboardIII. 480 to 120 VAC for a motor control circuit Select one: a.I only b.I & II only c.II & III only d.I & III only e.I, II & III e. I, II & III NEC® Section 250.20 Informational Note refers to a corner-grounded delta transformer. A diagram of such a system is shown at ___ in Figure 304.02. Select one: a.I only b.II only c.either I or II d.neither I nor II b. II only NEC® Section 250.20(B)(3) requires that a three-phase, four-wire, delta-connected transformer, in which the midpoint of one phase winding is used as a circuit conductor, be grounded. A diagram of such a transformer is shown at ___ in Figure 304.02. Select one: a.I only b.II only c.either I or II d.neither I nor II a. I only NEC® Sections 250.20, 250.21, and 250.22 state when a system is required, permitted, or not permitted to be grounded. Which of these transformer secondaries is permitted or required to be grounded?I. 120 to 12-volt, AC transformer for a low-voltage lighting systemII. 480 to 120/240-VAC, 1Ø, 3-wire to a panelboardIII. 480 to 120-VAC for a motor control circuit Select one: a.I only b.I & II only c.II & III only 47 | P a g e d.I & III only e.I, II & III c. II & III only An alternating current system of 50 to 1000 volts is required to be grounded where ___. Select one: a.the maximum voltage to ground does not exceed 150 volts b.the system is 3-phase, 4-wire, wye-connected in which the neutral is used as a circuit conductor c.the system is 3-phase, 4-wire, delta-connected in which the midpoint of one phase winding is used as a circuit conductor d.all of these d. all of these The secondary of a transformer delivers 12 volts. One of these secondary conductors must be grounded when the supply voltage to the transformer is from a ___. I. 2-pole breaker in a 120/208-volt, 3Ø, 4-wire panelboardII. 1-pole breaker in a 277/480-volt, 3Ø, 4-wire panelboard Select one: a.I only b.II only c.either I or II d.neither I nor II b. II only Where installed as overhead conductors outside of a building, AC systems of less than 50 volts ___ grounded. Select one: a.shall be permitted to be b.shall not be c.shall be c. shall be A transformer is supplied by a 277-volt circuit. The transformer delivers 120 volts for use in a control circuit. One of the two 120-volt wires is required by the NEC® to be grounded. Select one: a.True b.False a. true The minimum size of a grounded conductor in a conduit is based on ___. I. the size of the largest ungrounded conductor in that conduitII. the load the neutral must carry 50 | P a g e Generator ___ shown in Figure 304.03 would NOT be considered a separately derived system. Select one: a.I only b.II only c.both I and II d.neither I nor II a. I only Ground detectors for ungrounded system must be installed as ___ where the system receives its supply. Select one: a.close as possible to b.close as practicable to c.far as possible from d.far as practicable from b. close as practicable to An example of a system that is permitted to be grounded, but not required to be grounded, is a ___ system. Select one: a.240-V, 3Ø, 3-W b.240-V, 1Ø, 3-W c.both a & b d.neither a nor b a. 240-V, 3O, 3-W When a 120 to 12-volt, AC transformer is a component of a low-voltage lighting system, ___ secondary conductor(s) is/are permitted to be grounded. Select one: a.either b.neither c.both b. neither An electrical system not required to be grounded is a ___. Select one: a.single-phase, 3-wire, 120/240-volt system b.three-phase, 4-wire, 208/120-volt, wye system c.240/120-volt, 4-wire, three-phase delta system 51 | P a g e d.480/277-volt, 4-wire, three-phase wye system serving 277-volt loads e.240-volt, three-phase, 3-wire, delta system e. 240-volt, three-phase, 3-wire, delta system ___ are required to be installed on ungrounded 3Ø, 3-wire systems. Select one: a.Ground defectors b.Ground detectors c.Ground detectives d.none of these b. ground detectors ___ are not permitted to be grounded. Select one: a.Separately derived systems b.Alternating-current systems of 1 kV and over c.Circuits for electric cranes operating over combustible fibers d.None of these - they are all required to be grounded. c. Circuits for electric cranes operating over combustible fibers NEC® Sections 250.20, 250.21, and 250.22 state when a system is required, permitted, or not permitted to be grounded. Which of these transformer secondaries is not permitted to be grounded?I. the output conductors from a fluorescent ballast supplied from a 120-V circuitII. 120 to 12-volt AC transformer for a low-voltage lighting systemIII. 480 to 120-VAC for a motor control circuit Select one: a.I only b.I & II only c.II & III only d.I & III only e.I, II & III b. I & II only The smallest THHN/THWN copper grounded conductor that can be installed for a service is ___ when the ungrounded conductors are 1/0 THWN/THHN copper. Select one: a.6 b.2 c.3 d.1/0 e.1 52 | P a g e a. 6 A 1200-Amp, 3Ø, 4-wire service and will have four parallel sets of conductors feeding it. Each set is in a separate conduit. What is the minimum size of the grounded conductor required in each conduit? Most of the loads are 3-phase. Select one: a.3/0 b.2 c.350 d.4/0 e.1/0 e. 1/0 A 225 KVA, 480 delta to 208/120-volt, 3-ph, 4-w transformer is to be installed. One set of secondary conductors is installed from the transformer to a 400-A MB panelboard. There will be two parallel conduits to this 400-A panel. Each conduit will contain 3 each 3/0 ungrounded conductors and 1 each grounded conductor. The minimum size permitted grounded conductor will be installed in each conduit. A second set of secondary conductors is installed from the transformer to a 225-A MB panelboard. One conduit will be installed between this 225-amp panel and the transformer. The conduit will contain 4 each 4/0 conductors. The smallest grounded conductor you can install in each conduit to the 400-A PB is ___ AWG. Select one: a.2 b.3 c.2/0 d.1/0 e.3/0 d. 1/0 A 225 KVA, 480 delta to 208/120-volt, 3-ph, 4-w transformer is to be installed. One set of secondary conductors is installed from the transformer to a 400-A MB panelboard. There will be two parallel conduits to this 400-A panel. Each conduit will contain 4 each 3/0 conductors. A second set of secondary conductors is installed from the transformer to a 225-A MB panelboard. One conduit will be installed between this 225-amp panel and the transformer. The conduit will contain 3 each 4/0 ungrounded conductors and the smallest permitted size grounded conductor. Almost all the connected load is 3-phase. The smallest grounded conductor you can install in the conduit to the 225-A PB is ___ AWG. Select one: a.2 b.3 c.2/0 55 | P a g e A 480-volt, 3-phase service panel is to be installed to serve only 3-phase motors. The power company has set a pad-mounted 277/480-volt, 3Ø transformer for the new service. You will need to install which of the following between the transformer and the service panel?I. three ungrounded conductors II. one grounded conductor Select one: a.I only b.II only c.both I & II c. both I & II The NEC® requires that the ___ not be smaller than the grounding electrode conductor. Select one: a.ungrounded conductor b.grounded conductor c.both of these d.neither of these b. grounded conductor The grounded conductor is permitted to be ___ the GEC.I. a smaller size thanII. the same size asIII. a larger size than Select one: a.I only b.I or II or III c.III only d.I or II only e.II or III only e. II or III only Section 250.24(C) requires that the grounded (neutral) conductor be ___. Select one: a.run in a separate raceway to prevent injuries of heating effects due to induction b.routed with the phase conductors c.paralleled when larger than 1/0 AWG d.white in color b. routed with the phase conductors A grounded conductor is to be pulled in with 500 kcmil THHN/THWN aluminum conductors as part of a 277/480-volt, 3Ø, 4-W service to a 300-amp fused safety switch. The maximum unbalanced load on the neutral will be 140 amps. The minimum size of the neutral is ___ AWG aluminum. 56 | P a g e Select one: a.4 b.3/0 c.2 d.1/0 e.1 b. 3/0 Refer to Figure 304.06. The neutral loads supplied by the panel will not exceed 310 amps. The neutral in each conduit must be at least a ___ AWG or kcmil. Select one: a.350 b.1/0 c.2 d.3/0 e.2/0 a. 350 Where a grounded service conductor is run in parallel conduits and is used as a circuit conductor, its minimum size is determined based on ___. Select one: a.the size of the largest ungrounded conductor in each conduit b.the load current that it will be required to carry c.both a and b d.neither a nor b c. both a and b Refer to Figure 205.4. A 120/240-volt, 1-ph, 3-wire service is to be installed to serve a 175-Amp service. The conduit will have two ungrounded conductors and one grounded conductor. The ungrounded conductors are to be 2/0 AWG. The neutral load will be 65 amps. The smallest grounded conductor that can be installed is a ___ AWG conductor. Select one: a.3/0 b.2/0 c.1 d.4 e.3 d. 4 Refer to Figure 205.4. A 120/240-volt, 1-ph, 3-wire service is to be installed to serve a 100-Amp service. The conduit will have two ungrounded conductors and one grounded conductor. The ungrounded 57 | P a g e conductors will be 3 AWG copper conductors. All loads will be 240 volt. The smallest neutral that can be installed is a ___ AWG conductor. Select one: a.6 b.8 c.4 d.2 e.1 b. 8 Portable containers used to dispense drinking water shall be capable of being tightly closed, and equipped with a tap. Select one: a.True b.False a. true No employee shall be allowed to consume food or beverages in a toilet room or in any area exposed to a toxic material. Select one: a.True b.False a. true An adequate supply of potable water shall be provided on jobsites. Select one: a.True b.False a. true On a jobsite, drinking water can be dispensed from portable containers ___. Select one: a.through a tap on the container b.by dipping with a ladle or cup c.either a or b d.neither a nor b a. through the tap on the container 60 | P a g e a.Table 250.102(C)(1) b.T 250.28(D)(1) c.T 250.122 d.T 250.66 a. table 250.102(C)(1) Refer to Figure 304.06. The MBJ must be at least a ___ AWG or kcmil. Select one: a.1 b.1/0 c.2 d.3/0 e.2/0 e. 2/0 Where the main bonding jumper is a screw only, the NEC® requires that it be identified with ___.I. a green finish, visible when the screw is installedII. a hexagonal headIII. a listing mark, visible when the screw is installed Select one: a.I & II only b.III only c.I only d.I or III only e.II or III only c. I only A 277/480-volt, 3-ph, 4-wire, 400-A main breaker panelboard with 600 kcmil service-entrance conductors is installed as the main service equipment. The minimum size wire you will install for the MBJ is ___ AWG or kcmil. Select one: a.600 b.3 c.1/0 d.1 e.2/0 c. 1/0 A 1600-ampere, 3-phase, 208/120 volt service in a commercial building has a single fusible main switch and is supplied with five parallel sets of 500 kcmil ungrounded conductors. The minimum size permitted for the MBJ is ___ AWG or kcmil. 61 | P a g e Select one: a.3/0 b.4/0 c.250 d.300 e.350 e. 350 Determine the minimum standard size (AWG or kcmil) main bonding jumper required for a service with two sets of paralleled 750 kcmil conductors. Select one: a.250 b.2/0 c.3/0 d.4/0 e.400 d. 4/0 The ___ connects the equipment grounding conductors to the grounded (neutral) conductors. Select one: a.main bonding jumper b.grounding electrode conductor c.both a & b d.neither a nor b a. main bonding jumper This "gutter service" is to be built on the exterior back wall of a free-standing building. Three fused safety switches, one main breaker panelboard, and one MLO (main-lug-only) panelboard are installed above the gutter.Refer to the installation shown in Figure 304.21. Safety switch C is rated at 400 A and fused at 350 A and will feed the MLO 3Ø, 4-wire panelboard D. Does the NEC® permit a MBJ to be installed in panelboard D? Select one: a.Yes b.No b. no What is the smallest size wire permitted to be used as a system bonding jumper in an 800-A fused safety switch? The safety switch is fed from a transformer with four parallel sets of 3/0 AWG wire. Select one: a.2 AWG 62 | P a g e b.1 AWG c.1/0 AWG d.2/0 AWG e.3/0 AWG d. 2/0 AWG Refer to Figure 205.17. The smallest permitted size system bonding jumper for Panel LK is ___ AWG. Select one: a.2 b.3/0 c.6 d.1 e.2/0 e. 2/0 When a transformer feeds a 120/208-volt, 3-phase, 4-wire main breaker panel, the system bonding jumper and grounding electrode conductor are required to be installed at ___. Select one: a.the transformer b.the panel c.both the transformer and the panel d.either the transformer or the panel d. either the transformer or the panel The system bonding jumper and grounding electrode conductor are permitted to be installed in the ___ where a transformer feeds a fused safety switch and then a main-lug only panel. I. transformer II. safety switch III. panelboard Select one: a.I or II only b.I only c.I or II or III d.II or III only e.I or III only a. I or II only Refer to Figure 303.04. In each raceway between the transformer and Switch 1, 350 kcmil conductors are installed. Switch 3 is rated at 200 A, F 175 A with 2/0 AWG conductors installed to the wireway. Switch 2 is rated at 60 A, F 60 A with 6 AWG conductors installed to the wireway. 65 | P a g e A 240/480 to 120/240-volt, single-phase transformer is supplied from a 480-volt circuit and delivers power to a 120-volt load. X2-X4 is connected to 120-volt load terminal L1 and X1-X3 is connected to load terminal L2. If X1-X3 is also connected to a grounding electrode conductor, ___.I. the secondary voltage to ground is stabilizedII. the secondary fuses will open if the secondary is fusedIII. the secondary windings will rapidly overheat and burn in two, unless the secondary is fused Select one: a.III only b.II or III only c.I or II only d.I only e.II only d. I only Where multiple branch circuits are to be installed and there is not an existing grounding electrode at the second building or structure, ___. Select one: a.one or more grounding electrodes must be installed at the second building b.an equipment ground must be installed with the branch circuits c.both a and b d.neither a nor b c. both a and b A grounding electrode is required at a separate building or structure under which of the following conditions? Select one: a.one grounded system feeder is installed b.one ungrounded system feeder is installed c.more than one branch circuit is installed d.all of the above d. all of the above A 120/240-volt, 1Ø, 3-wire branch circuit is installed underground (in PVC with an EGC) to serve receptacles and lighting in a separate building. Is a ground rod or similar grounding electrode required at the separate building? Select one: a.Yes b.No b. no 66 | P a g e A service is installed in building A. Building B contains a 3Ø motor as well as lights and a receptacle. From building A, a 4-wire feeder is pulled to a sub-panel in building B. This feeder is installed underground in one PVC conduit. You must install ___.I. an EGC with the circuitII. a grounding electrode at the 2nd building Select one: a.I only b.II only c.both I & II d.neither I nor II c. both I & II An acceptable method for grounding a 120/208-V, 3Ø, 4-wire electrical system at a separate building or structure is to connect ___ conductor to the grounding electrode. I. the grounded II. the grounding III. an ungrounded Select one: a.II only b.I only c.I or II only d.III only e.II & III only a. II only A 120/208-volt, 4-wire, three-phase feeder supplies power from one building to a second building. At the second building, the neutral and equipment grounding conductors are required to be ___. Select one: a.kept separated, and the equipment grounding conductor is required to be connected to a grounding electrode b.bonded together, and not required to be connected to a grounding electrode c.kept separated, and grounding either conductor is optional d.kept separated, and the neutral is required to be connected to a grounding electrode e.connected to a grounding electrode a. kept separated, and the equipment grounding conductor is required to be connected to a grounding electrode A 120/240-volt, 1-ph, 3-wire feeder is to be installed underground in Schedule 40 PVC to feed a main breaker panelboard that is located in another building. How should the neutral and EGC be connected in the panel at second building? The panel at the second building has an insulated neutral bar and a ground bar that is bonded to the metal panel can (enclosure). A GEC has also been installed from the ground bar to the grounding electrode.I. Connect the neutral to the neutral bar and the EGC to the 67 | P a g e ground bar.II. Use a main bonding jumper to connect the neutral bar to the ground bar. Select one: a.I only b.II only c.both I & II d.neither I nor II a. I only Since Section 250.32(B) identifies the supply conductors to a second building as a "feeder or branch circuit," all equipment grounding conductors are sized according to ___. Select one: a.250.96 b.Table 250.66 c.250.32(A)(1) d.Table 250.122 d. table 250.122 An accepted method, for grounding at separate buildings, recognizes the installation of an equipment grounding conductor, when it is run with the feeder or circuit conductors. This EGC is required to be bonded to the grounding electrode(s) and the metal disconnecting means at this second building. A bonding jumper ___ be connected between disconnecting means and the grounded conductor. Select one: a.shall b.shall not b. shall not For existing installations and under certain circumstances, the grounded circuit conductor ___ used for grounding equipment on the line (supply) side or within the enclosure of the main disconnecting means for separate buildings. Select one: a.shall not be permitted to be b.shall be c.shall be permitted to be d.shall not be c. shall be permitted to be Section ___ of the NEC® states that normally non-current-carrying metal parts of portable generators can be bonded to the generator frame. Select one: 70 | P a g e Bonding is the process of connecting one or more conductive objects to the earth. Select one: a.True b.False b. false Taking the time to bond or ground when working around flammable vapors, gases, and dusts will help prevent a serious accident. Select one: a.True b.False a. true One way of preventing static electricity as an ignition source can be accomplished through ___. Select one: a.using fabric softener or dryer sheets to remove static cling from clothing b.keeping your workspace dust free c.substituting non-conductive pads when grounding or bonding is not possible d.keeping your workspace free of flammable materials e.using anti-static soap and shampoo f.none of these c. substituting non-conductive pads when grounding or bonding is not possible A static spark occurs when ___. Select one: a.one surface is charged positively and one surface is charged negatively b.both surfaces are charged negatively c.both surfaces are charged positively d.all of these e.none of these a. one surface is charged positively and one surface is charged negatively A static spark can occur when an electrical charge accumulates on the surfaces of ___ materials that have been brought together and then separated. Select one: a.five b.two c.three d.four 71 | P a g e b. two Static electricity is a hazard common to a wide variety of industries. Select one: a.True b.False a. true Is a grounding electrode conductor ever permitted to be smaller than the main bonding jumper? Select one: a.Yes b.No a. yes When a GEC is installed in a metal conduit, the GEC is connected in ___ with the conduit. Select one: a.series b.parallel b. parallel Which of the following materials are considered to be ferrous? I. RMC II. copper conductors III. EMT Select one: a.I & II only b.III only c.I, II & III d.II only e.I & III only e. I & III only Underground steel or copper water piping systems were traditionally used for grounding electrodes because they provided a large metal surface in direct contact with the earth. Select one: a.True b.False a. true 72 | P a g e Which of the following could be used as the GEC from the service equipment to building steel? I. THHN/THWN aluminum II. THHN/THWN copper III. bare copper Select one: a.II only b.I only c.III only d.II & III only e.I, II & III e. I, II & III A concrete-encased electrode is effective because ___.I. concrete retains moistureII. concrete provides a large contact area with the earth and the building weight maintains contact between concrete and earth Select one: a.I only b.II only c.both I and II d.neither I nor II c. both I and II Table 250.66 permits an aluminum grounding electrode conductor to be used with ___ service-entrance conductors. Select one: a.aluminum b.copper c.either a or b c. either a or b Electrical Nonmetallic Tubing may be used to protect a grounding electrode conductor from physical damage. Select one: a.True b.False b. false When a metal water pipe is used as the grounding electrode for a separately-derived system, the connection of the grounding electrode conductor is required to be made ___ where the pipe enters the building. 75 | P a g e b.single grounding electrode system c.ring electrode d.electrolytic grounding electrode b. single grounding electrode system The purpose of a grounding electrode is to enable electrons to flow into the earth when ___ occur. I. lightning strikes II. ground faults Select one: a.I only b.II only c.either I or II d.neither I nor II a. I only The grounding electrode conductor can be ___.I. covered II. stranded III. copper Select one: a.I & II only b.I only c.I & III only d.II & III only e.I, II & III e. I, II, & III Under what condition(s) does Section 250.60 permit the grounding electrode conductor for the lightning protection system to also serve as the primary grounding electrode? Select one: a.for buildings or structures less than three stories in height b.for residential occupancies only c.for all occupancies, other than health care facilities d.none of these d. none of these Which of the following does NEC® Section 250.62 not specify for the grounding electrode conductor? Select one: a.conductor material b.corrosion protection c.conductor type (solid, stranded, insulated, bare) d.connector types permitted 76 | P a g e d. connector types permitted A grounding electrode conductor may be ___. Select one: a.copper b.copper clad aluminum c.aluminum d.any of these d. any of these Which of the following could be used as the GEC from the service equipment to building steel?I. structural metal frameII. solid copperIII. other conductors resistive to corrosion Select one: a.I, II & III b.I only c.III only d.II & III only e.II only a. I, II, & III The ground clamp, for attachment to an aluminum grounding electrode conductor, is not permitted to be located within ___" of the earth. Select one: a.18 b.24 c.30 d.36 a. 18 Schedule 40 PVC (rigid polyvinyl chloride conduit) may be used to protect a grounding electrode conductor from physical damage. Select one: a.True b.False b. false Which of the following GECs is required to be protected, by installing it inside EMT or some equivalent means of protection, where it is NOT subject to physical damage? I. 6 AWG 77 | P a g e II. 4 AWG III. 8 AWG Select one: a.II only b.I only c.I & III only d.III only e.I, II & III d. III only Where a GEC is installed at 18 inches above grade on the exterior wall of a ___, the AHJ would most likely consider this a location that would NOT be subject to physical damage. I. house behind a flower bed II. building between a sidewalk and the building where grass is mowed with a tractor III. restaurant in the back alley where delivery trucks drive Select one: a.I only b.II only c.III only d.I & II only e.I, II, and III a. I only If a GEC were to be installed inside a "conduit" to protect it from physical damage, which of the following "conduits" could be used? I. Schedule 80 PVC II. EMT III. FMC Select one: a.II only b.I, II & III c.II & III only d.I & II only d. I & II only A wire-type GEC being installed from the service to the main water pipe is too short. According to the NEC®, another piece of wire may be spliced onto the short wire using ___. I. exothermic welding 80 | P a g e minimum size permitted. Select one: a.4 b.3 c.8 d.1/0 e.6 e. 6 Scenario 305.2A 400-amp, 120/208-volt, 3-ph, 4-wire feeder (without GFPE) is installed underground in PVC from one building to deliver power to a 400-A main breaker panel installed on another building. The maximum load calculated for the neutral is 40 amps. The feeder consists of three each 600 kcmil conductors for the "hots." All grounded conductors at the 2nd building are connected to an insulated neutral bar. All equipment grounding conductors at the 2nd building are connected to a ground bar.Refer to Scenario 305.2. The building steel is connected to the ground bar using a ___ AWG as the minimum size permitted. Select one: a.4 b.3 c.8 d.1/0 e.6 d. 1/0 Refer to Figure 205.7, shown above. Panel LD has a 600-amp main breaker and is supplied power by the transformer with a set of 350 kcmil conductors in each of two parallel conduits. From Panel LD, the minimum size GEC to the ground rod is ___ AWG. The GEC will not be subject to physical damage. Select one: a.2 b.3/0 c.6 d.1 e.2/0 c. 6 A dwelling service entrance is rated at 125 amperes and the service-entrance conductors are size 2 AWG with 75°C insulation and terminations. The minimum size grounding electrode conductor permitted to the metal underground water pipe is ___ AWG. Select one: a.4 81 | P a g e b.2 c.8 d.6 e.3 c. 8 A 2000 A switchgear is fed from a transformer with five parallel sets of 600 kcmil wire in five parallel conduits. ___ AWG or kcmil wire is the smallest GEC permitted to the main water pipe. Select one: a.400 b.3/0 c.600 d.250 e.1/0 b. 3/0 The maximum size copper GEC required for a 200-amp service panel to a 1" × 10' ground rod is ___ AWG. Select one: a.4 b.2 c.6 d.3 e.8 c. 6 A commercial service entrance is rated at 100 amperes and the service-entrance conductors are size 3 AWG. An 8 ft. ground rod is driven as the grounding electrode for the building. The minimum size GEC permitted to the ground rod is a ___ AWG. Select one: a.6 b.4 c.3/0 d.8 e.3 d. 8 Panel B, shown above in Figure 205.4, is a 120/240 volt 1-ph, 3-wire service panelboard. Panel B contains a 700 Amp 2-pole breaker Main Breaker. There is one 500 kcmil ungrounded conductor for AØ in each conduit and one in each conduit for BØ. There is also a grounded conductor in each conduit. The smallest GEC to building steel that can be installed is a ___ AWG. 82 | P a g e Select one: a.1 b.2/0 c.2 d.3 e.1/0 b. 2/0 The maximum size GEC required from the service equipment to the rebar in the bottom of the grade beam (poured concrete slab for a building) is ___ AWG. Select one: a.2/0 b.4 c.6 d.1/0 e.2 b. 4 A fire extinguisher rated not less than 10B shall be provided within ___ feet of wherever more than 5 gallons of combustible liquids or 5 pounds of flammable gas are being used. Select one: a.5,000 b.10 c.2,000 d.50 d. 50 The ___ is responsible for the development of a fire protection program to be followed throughout all phases of the construction and demolition work. Select one: a.employer b.electrician c.either a or b d.neither a nor b a. employer In a building where combustible materials have accumulated, a fire extinguisher rated not less than 2A shall be provided for each ___ square feet of the protected building area. Select one: 85 | P a g e c.equipment grounding conductor d.grounded conductor a. main bonding jumper Refer to the 800-amp, 120/208-volt, 3-ph, 4-W "gutter service" shown above. The conductors installed from the utility transformer to the gutter are 750 kcmil. Panel D is a 200-amp MLO panelboard and is fed from safety switch C (fused at 200 A). There is a nipple between Panel D and Switch C.Refer to Figure 307.51. The conductors that are installed through the nipple into Panel D are considered to be on the ___ side of the service. Select one: a.line b.load b. load A branch circuit is installed using metal conduit that will serve as the EGC. A separate EGC was not pulled in with the circuit conductors. However, a short section of flexible nonmetallic conduit was used in the middle of the run. When a bonding jumper is installed around the short section of flexible nonmetallic conduit, the jumper is in ___ with the EGC (metal conduit). Select one: a.series b.parallel a. series A 120/208-volt switchgear is shown in Figure 307.32. The 1000-amp main is fed with parallel sets of 300 kcmil THHN/THWN aluminum conductors. The minimum size of each of the copper conductors connected between the ground bar and each service pipe is ___ AWG. Select one: a.4 b.2/0 c.3/0 d.2 e.1/0 d. 2 The conductors at Point A in Figure 307.53 are on the ___ side of the service equipment. Select one: a.line b.load a. line 86 | P a g e Refer to Figure 307.33. In Section 1, the minimum size of the single bonding jumper is ___ AWG. The MAIN is rated at 700 amps and each service conduit contains 2/0 AWG conductors. Select one: a.1/0 b.4 c.2 d.1 e.3/0 a. 1/0 The size of bonding jumpers on the line or supply side of service equipment is based on the size of the ___. Select one: a.supply conductor b.rating of the overcurrent device a. supply conductor Which of the following tables is used to select a supply-side equipment bonding jumper? Select one: a.Table 250.66 b.Table 250.122 c.Table 310.16 d.Table 250.102(C)(1) d. table 250.102(C)(1) A 400-amp, 480-volt, delta service, with 600 kcmil SE conductors, is installed underground using one PVC conduit. It is stubbed up a pole to below the transformers. The conduit on the pole is RMC. The service equipment on the back of a building needs to be bonded to the pole-mounted RMC and the metal weatherhead on the top of the RMC riser. The minimum size of the bonding jumper is ___ AWG. Select one: a.2/0 b.1/0 c.3 d.3/0 e.1 b. 1/0 Scenario 307.1A 600-amp, 120/240-volt, 3Ø, 4-wire service is to be installed in two conduits. The service-entrance conductors installed are 350 kcmil. The two threaded RMC conduits enter the bottom of the CT can where a hole saw was used to cut the holes. The hole saw "walked" a bit and wallowed out 87 | P a g e the holes so that now bonding bushings on the conduits are required.Refer to Scenario 307.1. The smallest bonding jumpers you can install from the ground bar to each of the bushings is ___ AWG. Two bonding jumpers will be run, one to each bushing. Select one: a.1/0 b.2 c.3/0 d.2/0 e.1 b. 2 Scenario 307.2A 400-amp, 120/240-volt, 3Ø, 4-wire service is to be installed in two conduits. Aluminum 250 kcmil conductors are installed as the service-entrance conductors. The two threaded RMC conduits enter the bottom of the CT can where a hole saw was used to cut the holes. The hole saw "walked" a bit and wallowed out the holes so that now bonding bushings on the conduits are required.Refer to Scenario 307.2. The smallest copper bonding jumper you can install from the ground bar to the bushings is ___ AWG. Only one bonding jumper will be run to hit both bushings. Select one: a.3 b.2 c.2/0 d.1/0 b. 2 Refer to Figure 205.17. The minimum size bonding jumper for each FMC between the transformer and Panel LK is ___ AWG. Select one: a.1/0 b.3/0 c.2 d.1 e.2/0 c. 2 Electrical equipment enclosures are bonded together and connected to the power supply to ___.I. facilitate operation of the overcurrent protective deviceII. limit the voltage to ground Select one: a.I only b.II only 90 | P a g e b. 10 Refer to Figure 206.4. A 225-amp breaker in the 277/480 volt panel supplies power to the transformer. Four 4/0 copper conductors are installed from this breaker to the transformer. The minimum size equipment bonding jumper for the FMC between the 277/480 volt panel and the transformer is ___ AWG. Select one: a.1/0 b.4 c.2 d.1 e.3 b. 4 Refer to the 1600-amp, 277/480-volt installation shown in Figure 307.33. A 600-A switch in Section 3 feeds underground to a chiller through the two conduits. Each branch-circuit conduit to the chiller contains three each 350 kcmil conductors and an EGC. The minimum size of the jumper from the ground bar to the pipes supplying the chiller is ___ AWG. Only one jumper will be run and the two bushings will be connected together with the one wire. Select one: a.2/0 b.4 c.2 d.1/0 e.1 e. 1 When a metallic enclosure or raceway is effectively grounded, it will have zero potential with respect to ground. Select one: a.True b.False a. true When metallic elbows are isolated from possible contact by being buried at least 18 inches below grade, Section 250.80 permits these elbows to be ungrounded where used in runs of nonmetallic raceways. Select one: a.True b.False a. true 91 | P a g e Which of the following Code sections requires the non-current-carrying metal parts of the service equipment to be bonded together? Select one: a.250.4(B)(1) b.250.66 c.250.92(A) d.250.112 c. 250.92(A) What Code reference requires CATV ground rods to be connected to the building service ground rod, as one method of tying the two systems together? Select one: a.810.21(J) b.830.100(D) c.820.93 c. 820.93 When grounding electrode conductors are installed in metal conduit for physical protection, the conduit must be ___. Select one: a.bonded to the service-equipment enclosure b.bonded to the grounding electrode c.both a and b d.neither a nor b c. both a and b Danger signs are required where an immediate hazard exists. These signs have ___ as the predominate color in the upper panel. Select one: a.white b.yellow c.red d.orange e.black f.none of these c. red ___ signs, such as those used to advise that hard hats are to be worn, shall be used only to warn against potential hazards or to caution against unsafe practices. 92 | P a g e Select one: a.Directional b.Exit c.Traffic d.Warning e.Caution f.Danger e. caution ___ signs, such as those used to warn against high voltage, shall be used to bring attention to a potentially hazardous condition which, if not avoided, will result in death or serious injury. Select one: a.Danger b.Caution c.Traffic d.Directional e.Warning f.Exit e. warning Directional signs, other than ___ signs, shall be white with a black panel. Select one: a.caution b.danger c.automotive traffic d.warning c. automotive traffic Accident prevention tags shall be used as a temporary means of warning employees of a(n) ___ hazard, such as defective tools or equipment. Select one: a.existing b.potential a. existing A barricade is a means of obstruction to deter the passage of ___.I. persons II. vehicles Select one: a.I only b.II only 95 | P a g e a.is not b.is b. is The impedance of an electrical conductor is directly proportional to length. Therefore, decreasing the length of an equipment grounding conductor ___ the impedance of the ground-fault return path. Select one: a.increases b.decreases b. decreases Supplemental equipment grounding conductors are required to be used with wiring methods listed in NEC® 250.118 when ___. Select one: a.specified by the circuit designer b.installed in a corrosive atmosphere (including marine applications) c.high fault current is available d.the wiring method is not galvanized a. specified by the circuit designer When the EMT is used as the EGC for a circuit, its length has no effect on the opening time of the circuit breaker protecting the circuit. Select one: a.True b.False b. false Under conditions of maximum ground-fault current flow, an effective equipment grounding system should ___.I. maintain a low potential difference between metal parts that don't normally carry currentII. avoid electrical shock hazards Select one: a.I only b.II only c.both I & II d.neither I nor II c. both I & II The impedance of an electrical conductor is inversely proportional to cross-sectional area (measured in American Wire Gauge or circular mils). Therefore, increasing the size of an equipment grounding conductor ___ its impedance. 96 | P a g e Select one: a.increases b.decreases b. decreases The equipment grounding conductor is permitted to be ___. Select one: a.stranded b.solid c.insulated d.any of these d. any of these 4 AWG and larger conductors, of a basic color other than green, are permitted to be used as an equipment grounding conductor when which of the following conditions is satisfied. Select one: a.The identification encircles the conductor. b.The likelihood of a fault is low. c.Ground monitors are provided. d.The installation is a separately derived system. a. the identification encircles the conductor A circuit is installed in EMT and compression fittings are used. A separate EGC is NOT installed in the conduit. If a ground fault occurs and one or more couplings were never tightened properly, compared to normal operation, the fault current will be ___ and the OCPD will take ___ time to open. Select one: a.lower less b.lower the same c.higher less d.higher more e.lower more e. lower more We have an expert-written solution to this problem! The equipment grounding conductor is normally ___ in color. 97 | P a g e Select one: a.white b.green c.light gray d.black b. green In a circuit when a(n) ___ occurs, loose conduit couplings and connectors affect the opening time of an OCPD. I. short circuit II. ground fault III. overload Select one: a.III only b.II only c.II & III only d.I & II only e.I, II & III b. II only When a separate equipment grounding conductor (wire) is installed in a metal raceway, the wire is in ___ with the raceway. Select one: a.series b.parallel b. parallel Which of the wiring methods listed below requires that a separate equipment grounding conductor be run with the circuit conductors? I. aluminum IMC II. EMT III. PVC Select one: a.I, II & III b.III only c.II & III only d.II only e.I & III only