necnotevenclose
Senior Member
I'm working on a project that is adding a skid that has a control panel. I was able to physically look at the control panel and did not see the SCCR rating listed. I contacted the company and was told the SCCR marking is on the the inside cover of the control panel per UL 508A. As a side note, this control panel contains more than just control componets. I was told by the manufacture the SCCR rating is 5kA. I ran a fault study and came up with 20kA.
So it appears to me there are two issues:
1) The marking between UL 508A and 2008 NEC 409.110 does not match.
2) My calculated AFC is higher than the CP SCCR.
Per local AHJ I'm not able to provide current limiting fuses and I would rather not have to add additional conductor length to reduce AFC.
So I'm I viewing this wrong, if not are there any other options to reduce AFC?
So it appears to me there are two issues:
1) The marking between UL 508A and 2008 NEC 409.110 does not match.
2) My calculated AFC is higher than the CP SCCR.
Per local AHJ I'm not able to provide current limiting fuses and I would rather not have to add additional conductor length to reduce AFC.
So I'm I viewing this wrong, if not are there any other options to reduce AFC?