Reference family
Wire
AWG sizes, ampacity charts, and common branch-circuit lookups for the home workshop. Find the gauge, then a product that matches that size.
Start here
Circuit question or cord run? Start with AWG lookup or the extension-cord helper.
AWG / ampacity tool
Enter amps or pick a circuit. Get a common AWG range, then a cable or cord option that matches.
Open tool → Extension cord gauge
Load + length → suggested cord AWG class for temporary shop power.
Open tool → Wire gauge / ampacity lookup
Diameter and common branch associations by AWG or scene.
Open tool →Browse by topic
Shop-oriented wire questions — always verify code and product markings.
High-intent decide
What gauge for 20 amp?
Common copper branch-circuit association for a frequent shop question — conditions apply.
Branch circuits
15A / 20A shop circuits and typical copper AWG choices.
What gauge for 20 amp
Scene decide path for a common home-shop question.
Extension cords
Gauge vs length and load for temporary shop power.
AWG diameter table
American Wire Gauge to approximate mm and inches.
How it works
Look up the label, confirm conditions, then a restrained product match.
- 1
State the question
Amps, scene, or cord length — not whole-house design.
- 2
Read the AWG label
From the AWG tool or extension-cord helper — conditions matter.
- 3
Shop a matching product
Restrained SKUs only; confirm AWG on the listing.
FAQ
Disclaimer → Stay safe
Code · listing · conditions
Is this a substitute for the electrical code?
No. Workshop Ref gives common shop associations for education. Always follow local code, listing, temperature ratings, and a qualified electrician when required.
What is AWG?
American Wire Gauge — larger numbers are thinner wire. Diameter and ampacity notes on this site are simplified for workshop reference.
Can I use the extension cord tool for permanent wiring?
No. It is only for temporary cord-style questions. Permanent branch circuits need proper design and inspection.
Other references
Cross-family links for the rest of the shop.
