Replacing Circuit Breakers

[th3w01f]

New 50A breaker installed in place of the old 100A, this is actually an old Siemens panel. Total load of all breakers in the sub panel is 50A and highest measured while running everything including opening and closing the garage while turning on the TV is ~7A.

A Phase input wire connector was loose so I tightened that.

Attachment 63132

To the OP, the wiring to that bottom breaker is way undersized for the rating on the breaker, ( 100 A ? It is too faded to read from the picture ), especially if it is of any length, if I recall you said approximately 100 feet. Not only do you need to replace the breakers, you need to upsize the wire size using the de-rating for the distance to the equipment.

The wire run is probably 60 - 100', what gauge would be required to support the 50A? I've been searching but I don't understand the answers at this point. It the wire looks to be 6 - 8 gauge but that's just a guess.

[TheSparkens]

That looks to be # 10 Copper and should be # 4 Aluminum or # 6 Copper at 100' length. Maximum over current protection for a number 10 wire is 30 Amps period. QUOTE=th3w01f;1944735]New 50A breaker installed in place of the old 100A, this is actually an old Siemens panel. Total load of all breakers in the sub panel is 50A and highest measured while running everything including opening and closing the garage while turning on the TV is ~7A.

A Phase input wire connector was loose so I tightened that.

Attachment 63132



The wire run is probably 60 - 100', what gauge would be required to support the 50A? I've been searching but I don't understand the answers at this point. It the wire looks to be 6 - 8 gauge but that's just a guess.[/QUOTE]