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 a chart, a decide page, or the AWG tool.
AWG / ampacity tool
Pick a scene or AWG. Get diameter notes and a restrained product match.
Open tool →
Extension cord gauge
Load + length → suggested cord AWG class for temporary shop power.
Open tool →
What gauge for 20 amp
Short decide page: common copper association for a 20A-style question.
Open page →Browse by topic
Published wire charts and tools — new pages appear here when registered in the content catalog.
Highest-intent decide
What gauge for 20 amp?
Common copper branch-circuit association for a frequent shop question — conditions apply.
AWG wire gauge chart
Solid-copper AWG sizes 4/0–20 with diameter, cross-section area, and NEC ampacity at 60/75/90 °C.
Wire gauge chart
AWG to approximate copper diameter in inches and millimeters.
Wire ampacity chart
Simplified current associations next to common AWG sizes.
AWG / ampacity tool
Pick a gauge or a common circuit question — get AWG and a restrained product match.
Extension cords
Load + cord length → suggested AWG class for temporary shop power (informational).
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.
