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ACR 206 > 206-Power > Flashcards

206-Power Flashcards

1
Q

What is the main consideration in determining wire size

A

Amp draw

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2
Q

How is 277 V picked up

A

One leg to neutral in a 460 V system

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3
Q

What is the advantage of a 460 V system over a 238 V system

A

Uses less current and can use smaller wire

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4
Q

How can a delta with neutral system be detected

A

The high leg reads 195 to 213 to ground

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5
Q

How can a wye with neutral system be detected

A

All legs read the same

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6
Q

What has to be used when connecting aluminum wire

A

Oxidation paste and split bolt

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7
Q

What are the three disadvantages of aluminum wire

A

Corrodes easily, contracts and expands, have to use at least one size larger than copper wire

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8
Q

How is wire size for motors

A

Manufacturers specifications or 125% of the rated FLA/RLA

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9
Q

Name the four voltage currents commonly deliver today

A

115/230V single phase
208V 3 phase
240V 3 phase
460V 3 phase

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10
Q

What is the popular name for nonmetallic sheathed cable

A

Romex

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11
Q

By NEC standards what is the grounding conductor

A

It connects equipment to ground for safety

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12
Q

Number 10 wire can carry how many amps

A

30 A

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13
Q

What is 460 V single phase used for

A

Condenser fan motors on rooftops

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14
Q

What is a grounded conductor by the NEC

A

A neutral current carrying conductor

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15
Q

What does the term phase of an AC circuit refer to

A

The number of currents alternating at different time intervals through a load

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16
Q

What are triple pole breakers

A

Breakers for three phase

17
Q

Number six wire can carry how many amps

A

55 to 60 A

18
Q

Number 12 can carry how many amps

A

20 A

19
Q

What voltage is commonly brought to a residence

A

115 V 230 V single phase

20
Q

What is 277 V used for

A

Commercial lighting and hotel PTAC systems

21
Q

Number 14 wire can carry how many amps

A

15 A

22
Q

What might you do in a situation where there is no spare opening in a breaker panel for installation of equipment

A

Use mini breakers, slimline or piggyback

23
Q

What are the two failures of breakers and how are they found

A

Won’t pass voltage or lowers the voltage. Trips below the rated amperage

24
Q

Where are single pole breakers used and what is their voltage

A

In residential areas, 115 V

25
Q

Number eight wire can carry how many amps

A

40-45 A

26
Q

What does the term hertz mean

A

Cycles per second

27
Q

How is 460 V single phase picked up

A

Between any two of the hot legs in a 460 V system

28
Q

What is the voltage of double pole breakers

A

230 V

29
Q

What are the two types of electrical disconnect switches

A

Fused and nonfused

30
Q

What is the popular name for underground nonmetallic sheathed cable

A

Underground feeder

ACR 206 (2 decks)

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