definitely not! But my cable is in free basement air for all its length, and except for maybe 20 feet of it's ~60 foot run, its not even tacked to a flat-face-of-joist-or-beam. Would I do this if I knew that cable were running through an attic in Texas, or worse, an attic with insulation all around the cable. I've done this and have had plenty of long-lasting charge sessions where I monitored the cable(6-2 NMB) temperature and it got barely warm(88F of the maximum 140F) in my 65F basement. It >might< trip depending on how long your charge sessions really are and what other heavily loaded breakers are right next to it, and how hot it is where your panel is. The 50A breaker is still protecting the wire from overheat, in fact its rated less than the 55 maximum even not considering temperature factors. You can also choose to ignore the uprating for the breaker and just set the HPWC to 48 amps. IIRC there may also be special rules for short distances of non-compliant wire ratings, If an electrician were doing the swap, they may or may not want to upgrade the wire from the breaker to just before it enters the ground. So at least for the underground section, I wouldn't hesitate to consider this 6AWG suitable for 60 amp service. A 240V welder having 40-50A input will need a 50A circuit breaker and 6 gauge wiring. Klixon 5TC7-50 Circuit Breaker - 50 AMP - Visit and view our entire SkyGeek, Electrical, Circuit Breakers, Klixon 5TC7 Series Aircraft Circuit Breakers. Per NEC Table 310.15(B)(2)(a), we can uprate wire that is known to be in favorable temperatures. I'm probably gonna get crap for this, but at least for the underground-direct-buried section the wire should be fine.
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