jaggedben
Senior Member
- Location
- Northern California
- Occupation
- Solar and Energy Storage Installer
I think the burden of proof is on you to show that there IS a derating for continuous loads required for a non fused safety switch Note that the NEC 80% continuous derating we are familiar with is for OCPD's branch circuits, feeders, and service entrance conductors. I think you will find them in 210.19(A)(1), 210.20(A), 215.2(A)(1), 215.3, 230.42. It does not apply generally to all equipment. Class 320 ("400 amp") meter sockets are derated 80% for continuous use, but that is a product standard or UL thing not an NEC requirement.
How about posting the code section that requires derating switches?
Are the parts of a switch that carry current not 'conductors'? 705.60(B) requires continuous derating for conductors. It has an exception for "an assembly together with its overcurrent device(s) that is listed for continuous operation at 100 percent of its rating". It seems to me that could apply to a fused disconnect but not an unfused switch.
I don't why you guys are asking me to argue for a point I didn't wish to be true, but at this point I'm playing devil's advocate in hopes you can supply me with the right argument against an AHJ who doesn't agree.