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

	©Copyright Dave Rongey - About Me - Summary: 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)

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

The Following links will assist you with your electrical question:

For more information about Circuit Wiring
Circuit Wiring

This link is helpful as a Homeowner
Do-It-Yourself Electrical

Make sure not to miss these Resources for: How-To-Videos
Electrical Videos

Be Careful and Be Safe – Never Work on Energized Circuits!

For Best Results Consult a Licensed Electrical Contractor.
Locate An Electrical Contractor in Your Area

Learn How to Wire it Right with my

Complete Guide to Home Electrical Wiring
Help for Homeowners, Students,
Handyman, Handywomen, and Electricians
Including:
Wiring GFCI Outlets
Wiring Home Electrical Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
Troubleshooting and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
Electrical Codes for Home Electrical Wiring
....and much more.
This Guide to Wiring is the Perfect Resource
for Your Home Electrical Projects!

» Click here to learn more about Home Electrical Wiring «

Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all projects.

Electrical Wiring and Electrical Repairs

Unless otherwise posted, please refer to the following Guidelines for Electrical Projects:
Skill Level:
Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Licensed Electrical Contractor.
Electrical Tools Required:
Specific to the scope of the work and the condition of the home and the electrical project. Basic Electricians Pouch of Hand Tools, a Voltage Electrical Tester or Multi Function Meter.
Estimated Time:
Project Specific - Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area.
Precaution:
Identify the project electrical circuit, turn it OFF and Tag it with a Note before working with the wiring.
Important:
Modifying or installing electrical wiring should be done through the local building authority, installed according to applicable local and national electrical codes, with a permit, and have the required inspections
Notice:
Individuals who are not competent in the abilities and tasks required for electrical wiring projects are encouraged to contact a Local Licensed Electrical Contractor or Certified Electrician.

»Why Not Wire it RIGHT?«

	Home

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

Learn How to Wire it Right with my

» Click here to learn more about Home Electrical Wiring «

Electrical Wiring and Electrical Repairs

ELECTRICAL NEWS & UPDATES