If someone translates this different, I'm usually willing to be corrected. If your sub-panel is in an attached garage (or other room) main lug is OK. Video: Pro Tip Of The Day 100 Amp Sub Panel Size of the Wire/Conductors Generally speaking, you should be able to use 1 AWG aluminum or 3 AWG copper for 100 ampere circuits. For instance, for a 30A panel, use a 10 AWG, three-wire conductor. So if you put a 12-space sub panel in your detached shop, it needs to have a disconnect of some sort, easiest way is to get a main-breaker panel, or back feed a main. The cable from your main panel to the subpanel depends on the amperage rating. However, 225.34 (six disconnects rule) basically allows you to have up to (6) circuits in your panel and get away without a main disconnect. Short translation, a separate building needs a disconnecting means either outside or inside the structure, close to the point were the wires enter the building. There are three main types: automatic, manual transfer sub panel. I'll need to double check on that though, my brain's not telling me 100% on that, but I'm pretty sure thats how its spelled out in the National Code.Ģ25.31 - Disconnecting Means 27 Generac 100 Amp Automatic Transfer Switch Wiring Diagram - Wiring Diagram List. this is of course if your getting a permit and doing it "right" The worlds not going to end if you put std receptacles in.Ĭlick to expand.If its not within sight of the panel feeding it, it needs some sort of local disconnect, typically that would be a main breaker or a back-fed main if you had a main-lug panel. Based on what I mentioned in this guide, in addition to having your answer regarding wire sizes for 100 AMP service, you should have everything you need to: 1) identify your AMP service, 2) properly size your wires for upgrading your AMP service, and 3) know how to properly distance your wires to avoid a voltage drop of more than 3. That way you have easy access to reconfigure the panel as need be.įYI, code now requires that all Garage 15/20A 120V outlets be GFCI. Square D I-Line SL100 100A Sub Feed Lug for Breaker Panel 600V SL-100 Amp. Now, this is the correct wire size for a sub panel that is close to the electric device. you can get breakers and parts easily at Home Depot, your local friendly supply house etc). With the 80 NEC rule, the best wire size for 100 amp service is 1 AWG. The main breaker in the sup-panel however should be changed to match the feeder breaker.Īs for a panel, by a name brand (Square D, GE, Siemans etc) that fits your budget (don't go super cheap) and readily available (i.e. Like was said above, double check the wiring leading to the sub panel, make sure the breaker feeding that sub-panel is sized right for the wiring.įYI, if you only have, lets say and 80A circuit feeding the sub-panel, you can still run a "100A" sub-panel, heck you could run a 200A sub-panel, that doesn't mater since you'll only be able to draw out of it what the breaker (and the wire) feeding it are.
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