⚡ Electrical Blog

⚡ Electrical Guides & How-Tos

Every article below solves one real job with real numbers — then hands you to the calculator to run your exact dimensions.

4 guides

What Wire Size for a 20A Branch Circuit?

12 AWG copper on a 20A breaker: ampacity, the 80% continuous-load rule, and when to upsize.

The 2KIL/CM formula worked for 100 ft at 120V, upsizing rules, and the 60 ft threshold.

The 40% fill rule worked: THHN areas by gauge, derating limits, and conduit upsizing calls.

Existing 80A load plus new circuits against a 200A service, demand factors, and upgrade triggers.

Worked guides grouped by calculator — pick your trade.

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