1Which conductor can carry a higher current if they are there same gauge, copper or nickel?
Copper
2What conductor material is used for high temperature wire applications?
Nickel or nickel tinned copper
3What is the advantage of nickel tinned copper wire?
Handles high temp. & higher current than nickel.
4What are the two major downfalls of pure nickel wire?
Cost, and lower current capacity
5What is TGGT wire constructed of?
Nickel tinned copper wire, Teflon insulated w/ fiberglass braid.
6What is MGS wire constructed of?
Nickel tinned copper, mica insulated w/ fiberglass braid.
7Which wire should be used on a pizza oven operating at 650 degrees?
MGS
8What is special about SO or SJO cord that makes it desirable in the commercial foodservice industry?
Grease & oil resistant
9Ground wires must always be what color(s)?
Green, green w/ yellow tracer, or bare metal
10Neutral wires should always be what color?
White
11What size THHN wire should be used for a 20 amp load?
12 Gauge
12What size TGGT wire should be used for a 30 amp load?
12 Gauge
13What size SO cord should be used for a 40 amp load?
8 Gauge
14Give three common reasons for wire failures.
Undersized, temp. rating too low, poor conditions
15Why must burned or discolored wire be replaced?
Once burned or discolored, the current carrying capacity drops significantly. Also connections will overheat.
16If you put new terminals on discolored wire what will happen?
They will burn off again
17Many high temperature wire insulations will turn dark, or brown after a short period of use in high ambient temperatures. What does this color change indicate?
THat the wax coating on the wire has become hot from ambient conditions. This wire is usually still clean and fully functional