I have a 20 amp circuit on which I would like to branch a light bulb. Does code allow me to use 14 gauge wire to the 60 watt light bulb or must I use 12 gauge?

Thank you.

If you are using a 20 amp OCPD (breaker) then you must use #12 AWG cable.

If you use 14 AWG for any part of the circuit, then you must reduce the breaker to 15 Amps.

Running 20 amp through 14 AWG cable is a violation of code and a nasty fire hazard.

The whole circuit must stay #12. There is no provision for going smaller to a fixture.

Sorry, the codes are in place for safety's sake.

Quote:

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Originally Posted by drnewknee

Interesting that the light fixture itself uses what looks like 16 gauge wire.

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Just for reference, light fixtures, or lumiaires, do not follow the same rules are building wiring. A fixture can have 18ga wire even if attached to a 20A circuit.