when do I need a 100k AIC?

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Old 06-10-19, 12:23 PM
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when do I need a 100k AIC?

I see some load centers are rated at 100kA and some at 22k. When is the higher required?
 
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Old 06-10-19, 12:57 PM
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It's based on the size of the upstream utility transformer, fuses and possibly the cabling in between (calculated as a fuse). The AIC should be greater than the highest possible fault current coming in the service lines. Residential stuff should all be OK at 22kA, but commercial sites or multi-tenant might need higher AIC and/or coordination with upstream fusing at the main service entrance.
 
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Old 06-11-19, 08:40 AM
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I have a quite short overhead drop of maybe 25 foot to a 50kVA pole transformer.
I don't want to do a new load center at my house that will be rejected.
I'll talk to a distribution guy at the POCO.
 
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