Which of the following unit clearances is typically the largest?
A) Service clearance
B) A 6-inch clearance from all combustibles on all sides
C) A 12-inch clearance from all items that can be damaged by the strong magnetic force field generated by the furnace
D) Clearance for the vent
A
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When selecting heater elements for the overload relays, the electrician should remember that each of the relays carries only ____ of the motor current.
a. a fifth b. a quarter c. a third d. half
How long is the W-beam shown in Figure 3?
a. 12 b. 22-1/2 c. 50-1/2 d. 72
______________________ should not be worn while working on a construction site.
A. stocking caps B. gloves C. knee pads D. rings
The diverse loads served by many modern residential and light commercial systems often dictate that the distribution system contains elements from ____ of the basic distribution systems discussed in this chapter.
a. one specific b. two or more c. at least three d. possibly none