Quiz on the Code

Commercial Wiring Practices

1. A system that is supplied from an autotransformer is ______.
 (a) a separately derived system
 (b) an ungrounded system
 (c) a separately grounded system
 (d) not a separately derived system

2. If aluminum conductors are used for the grounding electrode conductor, it shall not be placed within ______ of contact with the earth.
 (a) 12"         
 (b) 15"           
 (c) 18"                   
 (d) 24"

3. The life safety branch in a health care facility is designed to supply ______ as part of the essential electrical system.
 (a) lighting for egress
 (b) power to equipment critical to human life 
 (c) power for equipment that maintains comfort or ventilation 
 (d) food refrigeration equipment

4. Where one neutral is associated with multiple ungrounded conductors, the associated conductors shall be ______.
 (a) marked with wire markers
 (b) grouped by cable ties
 (c) not required to be grouped if obvious
 (d) Any of the above.

5. Multiwire branch circuits can be used to supply ______.
 (a) single-phase line-to-neutral loads with single-pole breakers and handle ties
 (b) 3-phase loads with three individual breakers
 (c) only three-phase Delta 4-wire loads
 (d) ungrounded loads only

6. Bathrooms are required to have ______.
 (a) AFCI
 (b) GFCI
 (c) DFCI
 (d) None of the above.

Answers:
1.  (d)  
2. (c) Ref: 250.64(A)
3. (a) Ref: Art 517
4. (d) Ref: 200.4
5. (a) Ref: 240.15(B)
6. (b) Ref: 210.8