Conductor Material & Sizes

Question 1

Which condition is NMD90 suitable for?
A) Wet locations
B) As a consumer’s service conductor
C) Direct burial
D) Branch circuits

Answer 1

D)

Question 2

What is the primary function of a sheath?

Answer 2

To provide a hermetic seal.

Question 3

What is the maximum allowable conductor insulation temperature of T90 Nylon if it is exposed to oil?

Answer 3

60° C

Question 4

If a conductor is not marked with a low temperature rating, what is the recommended minimum installation and handling temperature?

Answer 4

-10° C

Question 5

What is the minimum size of equipment wire rate at 300 V that can be used, if it not for wiring a luminaire?

Answer 5

No. 26 AWG

Question 6

What temperature column of Table 2 would be used to size the NMD90 conductors for a range in a dwelling unit, if it is connected to a 40 A circuit breaker rated at 75° C at one end, and a 14-50R receptacle with no marked temperature rating at the other?

Answer 6

60° C

Question 7

What is the minimum size of RW90 conductor that can be used for a non-continuous 50 A load, if the conduit the conductors are in contains eight current carrying conductors? Equipment and terminations are rated at 75° C.

Answer 7

No, 4 AWG

Question 8

What is the minimum size of TW75 conductors that can be used for a 120 A non-continuous load, if the conductors are run through an area with an ambient temperature of 45° C?

Answer 8

No. 1/0 AWG

Question 9

What is the minimum size of SJOW flexible cord that can be used to feed a 13 A non-continuous load of the cable they are in contains five current carrying conductors?

Answer 9

No. 12 AWG

Question 10

What is the percent demand factor that can be applied to a neutral conductor, where the ampacity is greater that 200 A?

Answer 10

70%