Question

dwelling un 4. Type NM-B Cable enters a metal device box and is secured by a cable clamp at the bottom of the box. The cable is installed so the cable jacket extends "1/4 in. (6 mm beyond the cable clamp and free conductors begin at the end of the cable jacket a shown in Figure 1.39. If the device box has a depth of 3.5 in. (90 mm), the minimum permitted length of free conductor in this box is required to be not less than: A 3 in. (75 mm) B. 6 in. (150 mm). 6.5 in. (163 mm). D. 8 in. (200 mm) E. 12 in. (300 mm). Code reference 5. Type NM-B Cable is used in a dwelling as a switch loop from a ceiling box at a lighting outlet to a single-pole switch on the wall. A 120-volt, black, insulated conductor md a white, insulated neutral conductor are run using Type NM-B Cable to the ceiling box as shown in Figure 1.40. The white, insulated conductor from the ceiling box to the switch box: A. is permitted to be either the 120-volt supply to the switch or the return to the light. B. is only permitted to be the return to the light. C if marked to identify it as an ungrounded conductor, is permitted to be t return to the light. D. is only permitted to be the return to the light and must be marked to identify it as an ungrounded conductor E. is only permitted to be the 120-volt feed to the switch and must be permanently marked to identify it as an ungrounded conductor. Code reference TYPE NM-B CABLE. 12/2 wG GROUNDING WIRES TYPE NM-B CABLE. 2/2 WG LIGHTING OUTLET SWITCH Figure 1.40 Nonmetallic-Sheathed Cable is used to wire a circuit containing a ceiling luminaire

Answer 1

4. B
At least 150 mm (6 in.) of free conductor, measured from the point in the box where it emerges from its raceway or cable sheath, shall be left at each outlet, junction, and switch point for splices or the connection of luminaires or devices.

Code Reference: 300.14

5. E.

Switch loops are used where the installation uses multi color cable.Article 200.7(C)(2) permits a white or gray conductor to be reidentified as an ungrounded conductor at all locations where the conductor is visible. The re-identified white conductor is also required to be the feed, supplying the source of power to the switch. Under no circumstances is it permitted to be the switched return conductor to the load.

Code Reference: 200.7