Chapter 18, Problem 18R

List the proper trade size of electrical metallic tubing for the following. Assume that THHN insulated conductors are used. See Chapter 9, Table C1, NEC.

1. a. Three 14 AWG ___________________
2. b. Four 14 AWG ___________________
3. c. Five 14 AWG ___________________
4. d. Six 14 AWG ___________________
5. e. Three 12 AWG ___________________
6. f. Four 12 AWG ___________________
7. g. Five 12 AWG ___________________
8. h. Six 12 AWG ___________________
9. i. Six 10 AWG ___________________
10. j. Four 8 AWG ___________________

To determine

Find the trade size EMT that is required for three 14 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for three 14 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that three 14 AWG THHN conductors require trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT. EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for three 14 AWG THHN conductors.

To determine

Find the trade size EMT that is required for four 14 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for four 14 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that four 14 AWG THHN conductors require trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT. The EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for four 14 AWG THHN conductors.

To determine

Find the trade size EMT that is required for five 14 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for five 14 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that five 14 AWG THHN conductors require trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT. EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for five 14 AWG THHN conductors.

To determine

Find the trade size EMT is required for six 14 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for six 14 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that six 14 AWG THHN conductors require trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT. EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for six 14 AWG THHN conductors.

To determine

Find the trade size EMT is required for three 12 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for three 12 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that three 12 AWG THHN conductors require trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT. EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for three 12 AWG THHN conductors.

To determine

Find the trade size EMT that is required for four 12 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for four 12 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that four 12 AWG THHN conductors require trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT. EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for four 12 AWG THHN conductors.

To determine

Find the trade size EMT that is required for five 12 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for five 12 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that five 12 AWG THHN conductors require trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT. EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for five 12 AWG THHN conductors.

To determine

Find the trade size EMT that is required for six 12 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$4$}\right.$ EMT is required for six 12 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that six 12 AWG THHN conductors require trade size $\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$4$}\right.$ EMT. EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$4$}\right.$ EMT is required for six 12 AWG THHN conductors.

To determine

Find the trade size EMT that is required for six 10 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for six 10 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that six 10 AWG THHN conductors require trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT. EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ EMT is required for six 10 AWG THHN conductors.

To determine

Find the trade size EMT that is required for four 8 AWG THHN conductors.

Answer to Problem 18R

The trade size $\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$4$}\right.$ EMT is required for four 8 AWG THHN conductors.

Explanation of Solution

Discussion:

Refer to Table C1, Annex C of the NEC shows that four 8 AWG THHN conductors require trade size $\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$4$}\right.$ EMT. EMT is permitted to serve as the equipment ground as provided in NEC 250.118(4).

Conclusion:

Thus, the trade size $\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$4$}\right.$ EMT is required for four 8 AWG THHN conductors.