I have encounter a problem with a piece of equipment being installed on our site. I have a 480v, 800A MCC. Our short circuit current is calc'd at 19.5 K amps available current. From this MCC I have a bucket with a 50A breaker (65 kaic), #6 XHHW aprox 30' long, feeding a listed 3 phase 480v air compressor. The compressor control cabinet came in listed by CSA (not the US approved version, but that's another story), with a short circuit sticker that said "Equipment is not suitable for use on circuits with more than 5 kaic available". Not being sure, I had the engineer do a calc on the circuit and he came up with 8.3 kaic available. Upon notifacation, the contract had the manufacturer remove the control cabinet for repairs. A month later the unit comes back with the exact same parts in it and a "new" sticker marked "not suitable for use on circuits with more than 100 kaic available". Should I accept this installation? I don't feel the manufacturer made a real effort to make the repairs. As the AHJ inspector, do I reject the entire piece of equipment, regardless of the listing? Thoughts either way????
Short Circuit rating of equipment
- Thread starter KevinVost
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This is the way that I understand it:
5ka is a default rating when a piece of control has not been tested to get a combination rating. It is common for combination starters to be tested to have a 65kaic combination rating.
Also, if an OEM that assembles a combination starter is not a CCSA/UL lapproved shop the devices that they assemble can not be rated at no more that 5kaic.
You may have to replace the control with an assembly that is listed be an approved listing agency.
5ka is a default rating when a piece of control has not been tested to get a combination rating. It is common for combination starters to be tested to have a 65kaic combination rating.
Also, if an OEM that assembles a combination starter is not a CCSA/UL lapproved shop the devices that they assemble can not be rated at no more that 5kaic.
You may have to replace the control with an assembly that is listed be an approved listing agency.
110.3(A)(1)
FPN: Suitability of equipment use may be identified by a description marked on or provided with a product to identify the suitability of the product for a specific purpose, environment, or application. Suitability of equipment may be evidenced by listing or labeling.
The fpn is not inforceble but it does say "listing OR lableling" So I read that as saying you don't have to require a UL listing, you could except the labeling as enough.
FPN: Suitability of equipment use may be identified by a description marked on or provided with a product to identify the suitability of the product for a specific purpose, environment, or application. Suitability of equipment may be evidenced by listing or labeling.
The fpn is not inforceble but it does say "listing OR lableling" So I read that as saying you don't have to require a UL listing, you could except the labeling as enough.
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