What are the voltage ratings for CL2 and CL3 cables?

• A. CL2 up to 300 volts; CL3 up to 150 volts.
• B. CL2 up to 150 volts; CL3 up to 300 volts.
• C. CL2 up to 600 volts; CL3 up to 600 volts.
• D. CL2 and CL3 both up to 75 volts.

Answer: (B)

Voltage rating shows the maximum voltage the cable insulation is designed to safely carry. For alarm-system cables used in low-voltage applications, CL2 is meant for lower voltage opportunities, so its limit is 150 volts. CL3 is built to handle a higher voltage while still meeting safety requirements for power-limited circuits, so it is rated up to 300 volts. This aligns with how Class 2 and Class 3 circuits are defined: Class 3 permits a higher voltage than Class 2, even though both are limited in power for safety. So the best match is CL2 up to 150V and CL3 up to 300V.