Starting on page 7, the white paper that Rich linked to also references UL
508A, supplement SB, which is a method of determining SCCR for industrial
control panels without test. The method at a high level involves carrying
over the SCCR rating of the "weakest link in the chain" from a protective
Hi Brian:
See the very last line of:
https://www.mouser.com/pdfDocs/littelfuse_industrial_whitepaper_increase_sccr.pdf
Best regards,
Rich
From: Ralph McDiarmid
Sent: Tuesday, May 14, 2024 11:41 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] SCCR Rating
Could this number to used to select a suitable circuit breaker and so the
interrupting voltage is an important parameter?
The nameplate rating on the machine should be the information an electrician
needs during installation and selection of wire size and type.
Ralph
From: Brian
Greetings to all.
I am new to SCCR ratings on industrial machinery. The ratings I have seen
sometimes has a "Maximum Voltage" included, such as;
SCCR: 22kA, 600V Maximum
Where does the voltage value come from? In one case, the machine had a
line voltage rating of "120/208 Vac", but the SCCR
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