Class 1 and Class 2 Circuits - Section 16 Flashcards

1
Q

How is a class 1 remote control circuit identified easily?

A

It uses a relay.

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2
Q

What are some common class 2 circuits in a typical single dwelling?

A
  • Furnace controls
  • Doorbell system
  • Central vac remote outlets.
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3
Q

What is the maximum voltage and power output rating in a class 1 extra low voltage power circuit?

A

30V

1000 V•A

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4
Q

What are the maximum over current devices used on #16 and #18 awg conductors, respectively.

A

10 A

5 A

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5
Q

Could one use ELC type cable in a class 2 circuit?

A

Yes, with limitations:

  • Class 2, 30 V maximum
  • Dwelling units of combustible construction
  • Dry locations
  • Where concealed or exposed (not subject to mechanical damage)
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6
Q

The ampacities of conductors used in a class 2 circuit (smaller than #14 awg) are found where?

A

Table 57

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7
Q

What is the maximum voltage and power rating of a class 2 circuit?

A

150 V

100 V•A

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8
Q

Generally speaking, can class 1 circuits occupy the same raceway as lighting and power supply conductors?

A

No, unless the class 1 circuit controls the same load that is being powered.

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9
Q

What is the maximum voltage of a class 2 circuit which can be supplied by a primary battery?

A

30 V

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10
Q

What is the maximum voltage of a class 1 remote control or signal circuit?

A

600 V

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11
Q

What is a low energy power circuit?

A

Conforming to the limitations of a class 2 circuit, while not being a signal or remote control circuit.

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12
Q

What is a remote control circuit?

A

A circuit which controls another circuit through a relay or other like device.

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13
Q

What is an extra low voltage power circuit.

A

A circuit conforming to a class 1 circuit and not a class 2 circuit, which is neither a remote control circuit or signal circuit.

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14
Q

What is a signal circuit?

A

Any circuit which supplies power to a device which gives off a recognizable signal.

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