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Old 12-02-2017, 06:59 AM   #1
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Am building a new service wherre the AIC is 31,000. I need (3) 200 amp disconnects for this. I usually use breakers, but is there an economical breaker for this AIC or do I need to go to a fusible disconnect?
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Old 12-02-2017, 07:19 AM   #2
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Am building a new service wherre the AIC is 31,000. I need (3) 200 amp disconnects for this. I usually use breakers, but is there an economical breaker for this AIC or do I need to go to a fusible disconnect?
AIC is a rating for a breaker or fuse, not the actual current... just a minor nit.

So where is this 31000 amps available? At the transformer? What is the wiring method between the transformer and disconnects? Copper, aluminum, PVC, rigid, overhead, single phase, three phase, 208, 480, etc?
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Old 12-02-2017, 07:31 AM   #3
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I haven't priced anything in ages, but if you are using 3 panels with mains, probably a series rated panel with a fusible main would be the least expensive (at least it used to be that way).

If you have a single disconnect for the whole service, past pricing for me would be a fused disconnect over a breaker.

All that being said, I'd try to upsell the breaker install if you find the correct one.
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Old 12-02-2017, 11:36 AM   #4
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I haven't priced anything in ages, but if you are using 3 panels with mains, probably a series rated panel with a fusible main would be the least expensive (at least it used to be that way).

If you have a single disconnect for the whole service, past pricing for me would be a fused disconnect over a breaker.

All that being said, I'd try to upsell the breaker install if you find the correct one.

The RK fuses have the highest AIC for the $$$

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Old 12-02-2017, 02:19 PM   #5
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Am building a new service wherre the AIC is 31,000. I need (3) 200 amp disconnects for this. I usually use breakers, but is there an economical breaker for this AIC or do I need to go to a fusible disconnect?
For that high of AIC typically RK fuse useally do it for pricewise vs the high AIC rated breakers are.

but the actual numbers will varies a bit depending on distance and type of conductor and type of transfomer so the number can be reduced somehow

in this case you may need a EE to stamp the correct info before you get too far with the OCPD AIC rating. that the inspectors may want to see that details. so be prepared for that.
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