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Murray 400 amp breaker panel?

Asked Feb 18, 2012, 05:32 PM — 2 Answers
I have a Murray 400 amp service panel. The Short Circuit Current Rating is 20,000AMPs. I need to know the Short Circuit Interrupting Rating. Can anyone help?

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tkrussell's Avatar
tkrussell Posts: 9,673, Reputation: 3698
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#2

Feb 19, 2012, 04:09 AM


The short circuit interrupting rating of any circuit breaker installed in that panel cannot exceed the 20kA rating of the panel.

A panel, or any equipment that will contain a fuse or circuit breaker will have a Short Circuit Current Rating.

A protective device, such as a fuse or circuit breaker will have a Short Circuit Interrupting Rating.

Before you decide that the 400 amp panel you have chosen is of the proper short circuit rating, a short circuit coordination study must be done.

To see what is involved, here is as simple as an explanation I can find, this is not for a DIY. If your an electrician, you should know this process.

http://www.cooperindustries.com/cont...lculations.pdf
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stanfortyman's Avatar
stanfortyman Posts: 4,898, Reputation: 1331
Electrical & Lighting Expert
  
#3

Feb 19, 2012, 05:17 AM


Quote:
Originally Posted by Joali View Post
I have a Murray 400 amp service panel. The Short Circuit Current Rating is 20,000AMPs. I need to know the Short Circuit Interrupting Rating. Can anyone help?
May I ask WHY you need to know this?
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