50 amp wire size software#
50 amp wire size code#
50 amp wire size professional#

I've been on both Tesla forums for about 4-5 years, and I can't believe I just came across an electric code thing for something as basic as wire size that I have never seen before until today. But a UMC Gen 2 would be fine since that will max out at 32 amps.Д¬heck my math, but this is my reading of the code. So in this configuration a UMC Gen 1 would NOT be allowed (even if you set it down in the car - I don't think that counts). But you still can't plug any load in that needs more than 40a (32a continuous). Since there is no 40 amp NEMA receptacle you can use the 14-50. So by this math it would appear the NEC would allow putting 8 AWG Romex (NM cable) on a 40 amp breaker even in temperatures up to 131 Fahrenheit would meet code.

Of course, we are still limited by the 60c limit of 40 amps. Checking the options it would appear that the 55c (131 Fahrenheit) limit for the 90c rated conductor column requires a. So we use table 310.15(B)(2)(a) to adjust for other ambient temperatures. Now these ratings are at 30c (max of 86 Fahrenheit) It is 8 AWG copper which table 310.15(B)(16) tells us is good to 55 amps at the 90c rating (only good to 40 amps at 60c rating). It is limited by Article 334 to the 60c rating, HOWEVER you are still allowed to do the temperature derating calculation from the listed insulation rating which is 90c. I am going to assume it has a labeled insulation rating at 90c (as all the modern Romex I have seen has). I am going to assume that we are talking about NM cable here (romex).

50 amp wire size professional#

Note that if you are going to have a professional come out, you might consider a Wall Connector instead (it all depends on your needs and use cases). This deration question is an area that exceeds my knowledge, so it may be time to engage a professional. Basically what I am getting at is I am unsure if you are allowed to use the 90c or 75c rating of the insulation which has higher limits to then derate back down to allow temps of 100f. I don't know about the situation where NM cable is rated to 90c, the breaker terminals and the receptacle terminals are rated to 75c, but the NM wire is artificially limited to 60c by code. But when doing derations you are allowed to use the rating of the actual insulation. NM cable is limited by code to the 60c rating event though I think it normally is rated to 90c insulation temps. But your callout of high temps give me pause. You also could possibly consider upping the breaker to a 40a breaker since even NM wire (rated at 60c) is good for 40a (32a continuous) and then purchase a UMC Gen 2 to use on it which maxes at 32a so no concerns there. #3 is not a horrible idea, it is likely the most robust They are typically only rated to 75c (though I think my receptacle is cheap and only rated to 60c). The issue is that I don't know the proper deration application when it is the panel and/or the end device (receptacle) that is exposed to the high heat. 86f is what the max temp is by default, but you are allowed to derate the wire based on its max temp rating (typically 90c) so that might give you some wiggle room. #2 would absolutely be a bad idea as it would overload the wire *unless* it is 8 AWG in conduit (like THHN wire) AND you do not have to apply a temperature deration to it.

50 amp wire size software#

#1 is no good since you can't trust the car to not get accidentally changed or to change itself post software update, etc. Thoughts? I'm hopeful that option 2 is viable even with my 8 gauge wire as that would be easiest.ДЁ AWG NM cable is rated for 40 amps (32 amps continuous) before any derations.

I'm in Phoenix and temperatures inside and outside the garage regularly get over 100F.ДЎ) Nothing, just charge at 24 amps and be happy.Дў) Replace the 30 Amp breakers with 50 Amp breakers and charge at 40 amps.ДЈ) Call an electrician to replace the 8 gauge wire with 6 gauge wire (will be a PITA I imagine), and replace breaker to 50 Amp. I opened the panel and best I could tell, the wiring is 8 gauge wiring from the panel to the NEMA 14-50 socket, with a length of about 10 feet between the breaker box and the socket in the garage. I reduced my charge to 24 amps (80% of 30 AP breaker) for regular charging, but, I can't imagine this is up to code. I went to check it and the breaker had flipped because only a 30 Amp breaker was placed on this NEMA 14-50 socket and my car was trying to draw 40 amps. I plugged in and on my first charge I got a 'charging interrupted message'.

I just moved into a home where the previous owner had a tesla and the NEMA 14-50 socket was already installed.