Using a smaller wire gauge for a 40-amp breaker violates the code and presents a safety. It is possible to install a 40-amp circuit breaker on a larger gauge wire, such as a 6-AWG wire, but installing it on a smaller gauge wire will violate the code. As we will see further on, if you need 100 amp service 50, 100. The correct 40 amp wire size needed to operate with a 40-amp breaker safely is an 8-gauge wire. Voltage Rating 120/240 VAC Amp Rating 100. For 100 amp service, you will need to use 3 AWG hot copper wire because it has 100A ampacity. Please note Wire And Cable Your Way does recommend consulting with a local electrician who can advise you on all local codes and other variables that may effect the wire size needed such as the length of your run.įeel free give us a call at 85 or email us here with any questions. For use with GE AQ Lighting Panels, and is suitable for Reverse Feed. Single Conductor #1 gauge Aluminum WireĬlick here for pricing on #1 gauge Aluminum wire 3.) 2-2-2 Ramapo Triplex Underground Secondary Distribution Cable for 100 Amp Sub-PanelĬlick here for pricing on 2-2-2 (URD) Triplex Aluminum Underground CableĪll of the cables above are in stock, available by the exact foot you need, and shipped the same day ordered.Single Conductor #2 gauge Aluminum WireĬlick here for pricing on #2 gauge Aluminum wire 2.) #1 XHHW-2 Wire for 100 Amp Sub-Panel.Rated for direct burial - no need for conduitĬlick here for pricing on #2/3C with ground Tray Cable (THHN-PVC) Aluminum Wire 1.) #2 XHHW-2 Wire for 100 Amp Sub-Panel The chart below will help you determine fuse or breaker size and the necessary wire size to service various wattage loads. ![]() Multi-Conductor #3 gauge THHN Copper Wire. ![]()
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