Quiz on the Code - Power Limited

1. A class 2 circuit is safer than a class 3 circuit from the standpoint of _______.
(a) electric shock
(b) fire ignition potential
(c) ability to generate power
(d) remote control capability

2. The insulation of Class 2 power limited cable is _______.
(a) 100V
(b) 150V  
(c) 300V
(d) 600V

3. Openings around electrical penetrations in fire-rated walls or floors need to be _______ to maintain fire ratings.
(a) blocked
(b) fire-stopped
(c) sealed
(d) tested

4. CI cables are used to _______ for power limited circuits.
(a) more current capability
(b) integrity of the circuit voltage
(c) circuit survivability in case of fire
(d) circuit integration of systems

5. If failure of a class 2 or 3 system used for safety control equipment would introduce fire or life safety hazard, it must be re-classified as _______ circuit.
(a) power limited
(b) Class 1
(c) Communication
(d) Class 3 

6. Class 2 and class 3 circuits are not permitted in the same conduit as _______.
(a) communication circuits
(b) Class 1 circuits
(c) power limited audio circuits
(d) PLTC cables

Answers: 
1. (a) Ref. 725.2 Definitions  
2. (b) Ref. 725.179(G)  
3. (b) Ref. 725.3-300.21
4. (c) Ref. 725.2
5. (b) Ref. 725.31
6. (b) Ref. 725.136(A)