DC CHAPTER 11
A wire that has a diameter of 162 mils has an area of _____ circular mils.
26,244
The National Electrical Code® _____ contains tables dealing with conductors for general wiring.
310
To test wire insulation, a special type of ohmmeter is used, called a(n) _____.
MEGGER
In the National Electrical Code®, the current carrying abilities of conductors are called the _____.
ampacities
There are two conductors, a red and a blue installed in metallic conduit. You are using a MEGGER to test for grounds. How should the two leads of the MEGGER should be connected?
both a and b above
There are six current-carrying conductors in a raceway that is to be installed in an area with an ambient temperature of 90°F. It is necessary to _____.
correct for temperature and derate (because of the number of conductors)
The unit circular mil is equal to the _____.
diameter of the wire in mils squared
The nonconductive covering around a wire is the _____.
insulation
The insulation used on conductors cannot operate in all possible temperatures. The highest allowable temperature is called the _____ temperature.
maximum operating
There are two conductors, a red and a blue installed in metallic conduit. You are using a MEGGER to test for shorts. How should the two leads of the MEGGER should be connected?
one to the blue lead and one to the red lead
When a conductor is very large it may become necessary to connect them in _____.
parallel
Materials that increase their resistance with an increase in temperature have a _____ coefficient of temperature.
positive
The longer the conductor, the more _____ it will have.
resistance
The ambient air temperature considered in relation to a conductor ampacity is the temperature of the _____.
surrounding air
If there are more than _____ conductors in a raceway, the ampacity of the conductors must be derated.
three