On 05/15/2024 9:05 AM -05 Brian Kunde <bkundew...@gmail.com> wrote:I appreciate the replies, but I am not getting the information I am seeking.Some machines have just the SCCR Rating, such asSCCR: 10kAbut a few machines we have looked at include a reference to the "Max Voltage", such asSCCR: 10kA RMS Symmetrical, 480V MaximumWhat is the source, code, standard, directive, etc. that calls out the Max Voltage as a requirement in the SCCR rating that is printed on the Nameplate label? We cannot find such a source.In our case, we have a machine that can operate at 230V, 380V, or 480V depending on how the motor is wired. So on a machine rated 230V it has a SCCR rating that includes the Max Voltage of 480V. We are getting push-back from the field saying that having the voltage on the SCCR rating is confusing. To resolve this, we want to remove the reference to the Max Voltage, but before we do that, we want to find out if it is mandated in the code or some standard.I can see where the max voltage might be required on some components. Maybe it is an old requirement that is no longer required. I am just guessing.Thanks again for your help.The Other Brian
On Tue, May 14, 2024 at 3:54 PM Scott Aldous <00000220f70c299a-dmarc-requ...@listserv.ieee.org> wrote: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 component standpoint to the overall panel. I wonder if that method may have been used for the machinery in question, with a component level voltage rating (improperly, in my opinion) shifted over to the end device. Note that UL 508A includes "at a nominal voltage" in its definition of SCCR.
On Tue, May 14, 2024 at 12:33 PM Richard Nute <ri...@ieee.org> wrote:
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 <rmm.priv...@gmail.com>
Sent: Tuesday, May 14, 2024 11:41 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] SCCR Rating Question
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 Kunde <bkundew...@gmail.com>
Sent: Tuesday, May 14, 2024 11:29 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] SCCR Rating Question
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 rating had a voltage rating of "Max 600V".
Can this be confusing? Might something think the machine can operate at 600Vac?
Thanks for any replies.
The Other Brian
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