What is the Rated Ampacity of Copper AWG 4-3 Romex?

';	The amperage capacity will depend on the Type of Insulation, such as THW, THHN, etc. They all have different temperature ratings. This will show… © By: Dave Rongey

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Electrical Question from Paula about Circuit Wiring

Received from Paula a Homeowner in Vicksburg, MS

Question: What is the rated ampacity of copper AWG 4 – 3 Romex wire with a #8 ground when used to route from an outside main panel to an inside sub-panel through a garage attic area? (Residential construction)

Dave’s Reply:
Thanks for your electrical question.
Hi Paula – The amperage capacity will depend on the Type of Insulation, such as THW, THHN, etc. They all have different temperature ratings.
Please follow this links where you will find more detailed information:
Allowable Ampacities of Insulated Wire Conductors

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