Service conductor Practice Test Questions -2
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Question 1 of 10
1. Question
1 pointswhat is the smallest copper wire size that can be used for service entrance conductors?
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Refer: NEC 230.31(B)
Service entrance conductors shall not be smaller than No. 8 AWG copper and No 6 AWG aluminum
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Question 2 of 10
2. Question
1 pointsIn a three phase balanced 4-wire system, the current in the neutral conductor …………………
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Question 3 of 10
3. Question
1 pointsWhat is the minimum size electrical service required for a single family dwelling unit?
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Refer: NEC 230.79(C)
The minimum electrical service required for s single family dwelling unit is 100 amperes
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Question 4 of 10
4. Question
1 pointsFor each service , what are the maximum allowable service dis-connectors?
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Refer : NEC 230.71 (A)
Not more than six switches or six circuit breakers should not be more than on each service disconnection.
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Question 5 of 10
5. Question
1 pointsWhat is the minimum vertical clearance that should be provided for service conductors from the height point of over which they pass?
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Refer: NEC 230.24 (A)
Vertical clearance should be minimum 2.5 m ( 8 feet )
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Question 6 of 10
6. Question
1 pointsThe 400 volts over head conductors that passes over public street must have a clearance of ……….
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Refer : NEC 230.24 (B)(4)
Over public streets, roads, driveways the minimum clearance should be 5.5 ( 18 feet)
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Question 7 of 10
7. Question
1 pointsWhen multi conductor cables are used as overhead service conductors, they must be attached to building or other structures by ……………………….
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Refer : NEC 230.27
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Question 8 of 10
8. Question
1 pointsService entrance cables shall be supported by strops with in …………….. distance of every service head.
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Refer: NEC 230.51 (A)
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Question 9 of 10
9. Question
1 pointsThe metal enclosures used for service conductor and equipment ………………
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Refer: NEC 250.80
All metal enclosures for service conductors must be grounded.
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Question 10 of 10
10. Question
1 pointsWhat size service conductor is required for a 120/240 volts single phase with a demand load of 48 KVA?
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I = P / E = 48000 / 240 = 200 amperes
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