The overcurrent protection must be of the same rating, or smaller, then any permanent device connected.
SB
Duplex receptacles are rated for either 15 amps or 20 amps, and the description you've been provided indicates a code violation.
The overcurrent protection must be of the same rating, or smaller, then any permanent device connected.
Doesn't matter how many devices - which in a residential application can be as many as 7 devices downstream (example I read was 7 receptacles in a living room on a 15 amp breaker). The breaker can not be of a higher rating then either the wire or the device.
SB
You are correct (thanks for the correction.) - Article 210. My mistake or perhaps a really old code book on this detail I had remembered before a later change. 20A is permissible for 20A or a few 15A under specific conditions, but 30A overcurrent protection is single 30A device only and no multitudes of 20A I thought I remembered. Yep, against code to do that.
having anything smaller than a 30a receptacle on a 30 amp circuit is not to code, nor is it safe. Here is an outline of what is allowed:
15a breaker - one or more 15a receptacles
20a breaker - single 20a receptacle
20a breaker - multiple 20a receptacles
20a breaker - multiple 15a receptacles
The circuit breaker is not just there to protect the wiring supplying the receptacle, is is also there to protect the device as well as what is plugged into it to some degree. You cannot supply a duplex 15a receptacle with a 30a breaker.
This is for reference only, consult applicable codes and hire a licensed professional or other qualified individual for all electrical work.
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