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Breaker Types
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Author:  jmoore284@gmail.com [ Wed Sep 11, 2024 7:43 am ]
Post subject:  Breaker Types

Is anyone aware of a good resource identifying when to use different breaker types (D, G, J, L, etc.)? We are performing studies for a couple sites where we've located older panels with breakers we cannot verify. If we are lucky they have their ampacity marked but none have their frame/type, or any other information marked. I'm hoping to provide the team with guidance so we can make a reasonable assumption based on the downstream load. For example, use a type D for a motor circuit.

Author:  JBD [ Wed Oct 30, 2024 3:09 pm ]
Post subject:  Re: Breaker Types

Prior to roughly 1985 breaker information was not often visible without removing the breaker.

Have you tried posting pictures on electrical contractor forums?

I would generally not trust generic breaker trip curves for arc flash incident energy purposes.

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