Romex Size and Amp Ratings Information

Core Issue:

  • What size Romex is recommended
  • Romex size for Amperage ratings


Romex size will depend on the amperage requirement of the appliance. Below is a chart of wire size for a given amperage:

Wire SizeAmpsWire Type
3/0 Gauge200 AmpsService entrance
1/0 Guage150 AmpsSerrvice entrance and feeder wire
3 Guage100 AmpsService entrance and feeder wire
6 Guage55 AmpsFeeder and large appliance wire
8 Guage40 AmpsFeeder and large appliance wire
10 Guage30 AmpsDryers, appliances, and air conditioning
12 Guage20 AmpsAppliance, laundry and bathroom circuits
14 Guage15 AmpsGeneral lighting and receptacle circuits

See also, AWG Electrical Wire Size.

Refer to the product installation guide for further information.

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