NEC Class 2 Power Source

2 replies [Last post]
docomo44's picture
Joined: 2017-01-05

Can anyone please let me know when must a Class 2 power source be used? I can find information as to the requirements of the Class 2 power source itself, or the Class 2 wiring, but couldn't find clear information on when they must be used in the first place.

sparky377's picture
Joined: 2013-10-07

I get the impression you are thinking of the issue backwards.

The NEC does not necessarily prescribe where a Class 2 Power Supply is required to be used. The NEC, in Art. 725, informs you what is and is not permitted in the way of wiring when using a Class 2 power supply. Same thing applies for Class 3 power supplies.

Where you may find use of a Class 2 or 3 power supply is in low-voltage systems such as fire alarm, security, audio, paging, intercom, nurse call, etc. The main advantage of these systems and their power-limited power supplies is the ability to route wiring without use of raceways.

docomo44's picture
Joined: 2017-01-05

Thank you for your comments to my inquiry. The ability to route wiring without use of raceways as written comes from the nature of the Class 2 source that it eliminate electrical shock hazard and fire hazard?

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