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· Chief Flunky
Field Service Engineer
Joined
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3,946 Posts
Most 600 amp circuit breakers that I have seen have twin 500 kcmls lugs. If you know the circuit breaker brand can you go to the breaker people to see what they come with. The generator guy I deal with knows what the machines come with. Maybe the non supply chain issues are creating the uncertainty. Whatever lugs the breaker company has on the shelf is what you will get.
Not quite true.

Square D standards:


Two holes, 400 MCM max, Cu only.

A common private labeled breaker:


Page 99 states lug holes (I think 2) are for 3/0 to 500 MCM aluminum, or 3/0 to 350 MCM copper. So 500 MCM copper probably fits but it’s not rated for it.

ABB/Hitachi/GE:


4/0-350 copper, 300-500 aluminum.

So I’m curious, which brand of breaker has two 500 MCM lugs at 600 A? None of the common ones do.
 

· Chief Flunky
Field Service Engineer
Joined
·
3,946 Posts
Lugs TC2J6500
3/0 to 500 MCM COPPER ONLY, 2 holes.

For some bizarre reason 300 is common around here. I hate it. I don’t carry lugs for it or any of the other odd sizes but we do cover Flex and coarse strand. We don’t cover DLO either…just not much call for it.

Easy to get around the Cu only. Ilsco makes all kinds of crimped pigtail or pin adapters.
 
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