Exam 8: Article 725 of the National Electrical Code; Classification of Circuits

Class 2 circuits may be installed in the same enclosure or cable with conductors of Class 3 circuits provided _________.

Class 3 conductor may be smaller than 18 AWG.

All Class 2 conductors may be strapped or attached to the exterior of a conduit.

Insulation requirements for Class 1 conductors 18 and 16 AWG must be suitable for 600 V.

You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF.   Answer the questions below. Calculate the total diameter of the TFN conductors.

The rating on power-limited tray cable should be rated for_____ V and not less than _______ AWG.

You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF.   Answer the questions below. What percentage fill is required by the NEC ?

Class 2 circuit conductors shall be insulated to a maximum of _________.

Pipe fill is required for which of the following circuits?

Class 2 AC power supplies between 30V-150V may operate at a maximum of __________.