Deck 8: Installation of Heating Cooling and Refrigeration Systems

Question 1

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

Answer 1

breaker panels

Question 2

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

Answer 2

The fusible design distribution center is the more popular design mainly because of its moderate cost.

Question 3

What is the purpose of an electrical distribution center?

Answer 3

Distribution centers are designed to distribute the electrical supply to several places in a large structure.

Question 4

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

Question 5

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.

Question 6

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

Question 7

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

Question 8

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

Question 9

What is the purpose of a breaker?

Question 10

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

Question 11

What are four factors to consider when selecting circuit conductors?

Question 12

Circular mil sizing runs from 250 MCM to ____________________ MCM.

Question 13

What is the function of a main breaker?

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

The American Wire Gauge lists the largest wire as ____________________.

Question 20

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