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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…
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)
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
The Following links will assist you with your electrical question:
For more information about Circuit Wiring
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Make sure not to miss these Resources for: How-To-Videos
Be Careful and Be Safe – Never Work on Energized Circuits!
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Electrical Wiring Video #2
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Dave's Companion Guide to Home Electrical Wiring:
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
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