TN LLE Conductors and Cables 3

Question 1

Per NEC 310.15(B)(7), what ampacity method applies to 120/240V, single-phase dwelling service conductors?

Accepted Answer

A special table with higher ampacities for service entrance conductors

Answer

Standard Table 310.16 values apply

Answer

83% of the standard ampacity

Answer

Conductors may be sized one trade size smaller

Question 2

What is the minimum size copper grounding electrode conductor for a 200-ampere service per NEC Table 250.66?

Accepted Answer

4 AWG

Answer

6 AWG

Answer

2 AWG

Answer

1/0 AWG

Question 3

When pulling conductors through a conduit, what is the maximum recommended pulling tension for copper conductors to avoid damage?

Accepted Answer

0.008 x cmil per conductor

Answer

0.006 x cmil per conductor

Answer

75 lbs per conductor

Answer

No limit if a pulling lubricant is used

Question 4

Per NEC 300.17, what percentage of a conduit's internal cross-sectional area can be filled when installing 3 or more conductors?

Accepted Answer

40%

Answer

31%

Answer

53%

Answer

60%

Question 5

What conductor type is required for wet locations per NEC 310.10(C)?

Accepted Answer

Any conductor rated for wet locations such as THWN, XHHW, or USE

Answer

THHN only

Answer

Only underground-rated conductors

Answer

Conductors with lead sheath only

Question 6

Per NEC 240.4(D), what is the maximum overcurrent protection permitted for 14 AWG copper conductors?

Accepted Answer

15 amperes

Answer

20 amperes

Answer

25 amperes

Answer

30 amperes