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