![]() For example, say you have a 15 amp circuit. Like dozer said, it's done commonly where the wire is oversized for the circuit, but derated for voltage drop. There are rules in art 430 that have to be followed before the 40A breaker could be used & NM cable (Romex®) if used has to be used at the 60 degree ampacity.It's acceptable in some cases. JimBut you cannot use a 20A or 30A receptacle w/ a 40A breaker, it would have to be hardwired. This will provide me some level of insurance protection should there be a fire in the future and someone try to blame it on the electrical work.įWIW I'm also a registered Professional Electrical Engineer. My work is also subject to inspection and I'm going to have it all inspected when I'm done. I have also contacted my AHJ who confirmed there are no local codes prohibiting it. I'm wiring my shop just as John and Chris, and have thoroughly reviewed the NEC for conformance. I don't expect you'll have a problem but you should confirm it for this application. I just checked a spare 15A receptacle in my box of electrical goodies and, in little raised letters, it says 10-14ga. Thus you need to confirm is that the approved wire size range for the breaker and receptacle terminals are rated to clamp onto 10 ga wire. This permits me to hook up my 5hp Unisaw with 10ga wire and a 40A breaker as recommended by Delta), but that doesn't apply here. The third issue provides exclusions specifically for connection to motors that let you use breakers greater than the ampacity of the wire (the 225% rule). For example, you'd have to carve down a #4 solid copper wire to get it into the press-fit connection this is not permitted. The second (caveat) is that the terminals on the breaker and receptacle must be rated for the wire you are going to put in them. The first requirement is the ampacity (current-carrying rating) of the wire must meet or exceed the protected load. Your AHJ (Authority Having Jurisdiction ) can confirm this for you. You can definitely install circuits with 20A breakers and receptacles with 10ga wire, as long as your local area doesn't specifically forbit it. Is it acceptable to size the breaker to the wire for 30A and downsize the outlet to 20A, if needed? What are the limitations on mixing and matching wire, breakers, and outlets? I realize there are limited combinations but it seems there is some flexibility here. 20A breaker with 20A outlet, to avoid surges but he indicated that wasn't allowed per the NEC. Originally, my plan was to size the breakers to match the outlets, e.g. He indicated that it was acceptable to use 10 gauge wire with both 20A and 30A outlets however, all of the breakers must be rated for 30A. ![]() With some minor electrical issues with the new house (GFCI related), I was able to speak with the builder's electrician, who is a journeyman, about the wiring for the garage. Currently, all of my tools either require 20A or 30A breakers. So, I'm planning to pull all 10 gauge THHN wire for more versatility down the road if I acquire more 30A rated tools. ![]() Even though the title is fairly generic, I'm specifically curious about sizing the breakers and outlets for 10 gauge wire.Īfter a recent move, I'm wiring the entire finished garage for 220 outlets via EMT, metal boxes, etc. ![]() I'm certain I've read this somewhere here before but I couldn't find those same threads so my apologies if this is a redundant question. ![]()
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