In air, nominal 20C ish room temp and the highest the Romex got was 34.2C, just a bit warm to the touch. Drew ~30A at 240V through 12/2 Romex and measured temp until the wire reached steady temp. We're talking "what breaker size keeps our 90C rated wire below 50C when it's buried in a foot thick of spray foam insulation in a hot attic while assuming the breaker actually trips at several amps higher than the rating? "īecause I'm an engineer and like this stuff, I ran a little bit of curiosity testing once. If two 50 amp devices are plugged into two 50 amp outlets on the same 50 amp CB, and those devices actually. If the circuit breaker protects at 50 amps, then the wire and outlet must be rated to handle 50 amps. The wire is not in a conduit at any point.Įdit: I had another look at the wire and I was mistaken, it is 8awg NM-B, not 8awg THHN.Įdit 2: Thanks so much folks! To answer some folks' questions, we live in the US, so based on everyone's very helpful comments, we are definitely getting the original electrician to switch out the wire with 6/3 NM-B.Īlso, code ratings are determined in the most crazy conservative ways you could imagine. The circuit breaker protects the wire, outlets, and a device plugged in from over drawing current, over heating, and starting a fire. A 50 amp circuit like this is used for new kitchen range installations. The 6 gauge cable for this circuit has 3 conductors and 1 ground. I contacted the electrician and they are willing to comeback and replace to the 8 gauge wire with 6 gauge wire, but they also suggested that I was overreacting and the circuit was safe as installed (though did not provide any explanation as to why).Īm I wrong? If it matters, the wire travels from the panel ~15 feet through the joists of our unfinished basement, through the floor and then immediately terminates at the receptacle. This wiring diagram illustrates installing a 50 amp circuit breaker for a 240 volt circuit. My understanding is that 6 gauge is standard for a 50amp circuit. After they left, I noticed that they had used 8 AWG THHN wire for the project. I had an electrician install a new circuit (50amps) for an induction range last week. ![]() Suggesting the burning scrap wire to remove the insulation will result in a ban. Do not post encouraging or mocking suicide, mental illness, or drug use.Ħ. No illegal, unethical, or disturbing subject matter. Example: Blogs, articles, news sites, YouTube channels, items for sale, ect.ĥ. No incorrect, unsafe, or hazardous informationīlatant incorrect information or hazardous advice will result with a ban On the circuit breaker end, you will of course need a 50 amp 240V breaker like shown below: When planning wire runs to determine the wire size or gauge you need, you can search the Internet for 'wire size calculator' and input your variables (length and desired voltage drop) and the script will output the wire gauge you will need. Adhere to the Reddiquette.ĭO NOT post any personal information of any kind. Civil disagreements can happen, but insults should not. No personal attacks on anyone at any timeīe polite and respectful in your exchanges. ![]() After a period of inactivity, this subreddit is under construction and will be available to the public shortly.
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