Deck 16: Installation of Heating, Cooling, and Refrigeration Systems

Question 1

Copper wire bends easily, has good mechanical strength, resists corrosion, and can be easily joined.

Answer 1

True

Question 2

Voltage drop in a conductor is of least importance when sizing wire.

Answer 2

False

Question 3

A(n) ____________________ enclosure can be used in any location, but it is much more expensive than other enclosures and therefore, is not used unless there is a viable reason.

Answer 3

explosion-proof,explosion proof

Question 4

A(n) ____________________ of enclosure can only be used where there were no problems of moisture, dust, or explosive fumes.

Question 5

What is the purpose of a breaker?

Question 6

What is the function of a main breaker?

Question 7

The allowable voltage drop of most manufacturers is 15% below the nameplate rating.

Question 8

Fusible load centers, or ____________________, are electric panels that supply the circuits in a structure with power and protect those circuits with fuses.

Question 9

Standard wire size is defined in the United States by the ____________________.

Question 10

Aluminum is a good conductor of electricity; however, it has a tendency to corrode.

Question 11

Circular mil sizing runs from 250 MCM (1/2-inch diameter) to ____________________ MCM (1-inch diameter).

Question 12

To calculate the voltage drop in a conductor, you must know the number of feet of wire that is used.

Question 13

The maximum recommended voltage drop for a branch circuit is eight percent.

Question 14

All heating, cooling, and refrigeration equipment should have some means for disconnecting the power supply at the equipment.

Question 15

The American Wire Gauge lists the largest wire as ____________________.

Question 16

The type of insulation surrounding the conductor usually determines its application and the amperage for which it can be used.

Question 17

A(n) ____________________ disconnect enclosure could be used in areas of moisture but not where dust or explosive fumes exists.

Question 18

Why is the fusible design distribution center more popular than the circuit-breaker design?

Question 19

What is the purpose of an electrical distribution center?

Question 20

What are four factors to consider when selecting circuit conductors?