Jay see 1997 GU build up

[Ben-e-boy]

4AWG.

That's what I found on the cable.

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That cable is way too small for a 120A C/B. If it is 4awg (which is just under 25mm2) it will be really pushing to be good for 80A at it's very best. That cable could go in smoke before that bresker even knows there is an issue. You'll need to either get a smaller C/B or up the cable size to atleast 50mm2.