Re: [PSES] SCCR Rating Question

[Scott Aldous]

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  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 
> *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 
> *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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-- 
Scott Aldous | Regulatory Compliance Manager | scottald...@google.com |
650-253-1994 <(650)%20253-1

Re: [PSES] SCCR Rating Question

[Richard Nute]

 

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 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 mailto: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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Re: [PSES] SCCR Rating Question

[Ralph McDiarmid]

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  
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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[PSES] SCCR Rating Question

[Brian Kunde]

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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