Class 1 and Class 2 Circuits - Section 16 Flashcards
How is a class 1 remote control circuit identified easily?
It uses a relay.
What are some common class 2 circuits in a typical single dwelling?
- Furnace controls
- Doorbell system
- Central vac remote outlets.
What is the maximum voltage and power output rating in a class 1 extra low voltage power circuit?
30V
1000 V•A
What are the maximum over current devices used on #16 and #18 awg conductors, respectively.
10 A
5 A
Could one use ELC type cable in a class 2 circuit?
Yes, with limitations:
- Class 2, 30 V maximum
- Dwelling units of combustible construction
- Dry locations
- Where concealed or exposed (not subject to mechanical damage)
The ampacities of conductors used in a class 2 circuit (smaller than #14 awg) are found where?
Table 57
What is the maximum voltage and power rating of a class 2 circuit?
150 V
100 V•A
Generally speaking, can class 1 circuits occupy the same raceway as lighting and power supply conductors?
No, unless the class 1 circuit controls the same load that is being powered.
What is the maximum voltage of a class 2 circuit which can be supplied by a primary battery?
30 V
What is the maximum voltage of a class 1 remote control or signal circuit?
600 V
What is a low energy power circuit?
Conforming to the limitations of a class 2 circuit, while not being a signal or remote control circuit.
What is a remote control circuit?
A circuit which controls another circuit through a relay or other like device.
What is an extra low voltage power circuit.
A circuit conforming to a class 1 circuit and not a class 2 circuit, which is neither a remote control circuit or signal circuit.
What is a signal circuit?
Any circuit which supplies power to a device which gives off a recognizable signal.
