Re: [PSES] SCCR Rating Question

2024-05-16 Thread Ralph McDiarmid
We have an answer from UL508A for industrial panels but the question was, “ 
SCCR ratings on industrial machinery”

 

Perhaps it is the question that is the difficulty here.

 

Ralph

 

From: Bill Lawrence  
Sent: Thursday, May 16, 2024 2:50 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] SCCR Rating Question

 

Assume UL 508A

 

Marking is:

 



-Original Message-
From: MIKE SHERMAN mailto:msherma...@comcast.net> >
Sent: May 15, 2024 10:38 PM
To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG> >
Subject: Re: [PSES] SCCR Rating Question

 

Brian —

 

I am equally mystified by qualifying an SCCR with a voltage. Perhaps you could 
network into a friendly UL 408a panel shop and see what they say.  

Mike Sherman 

Sherman PSC LLC

On 05/15/2024 9:05 AM -05 Brian Kunde mailto: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 as 

 

SCCR: 10kA

 

but a few machines we have looked at include a reference to the "Max Voltage", 
such as

 

SCCR: 10kA RMS Symmetrical, 480V Maximum

 

What 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 
<0220f70c299a-dmarc-requ...@listserv.ieee.org 
<mailto:0220f70c299a-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 mailto: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 mailto:rmm.priv...@gmail.com> > 
Sent: Tuesday, May 14, 2024 11:41 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto: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 <mailto: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

2024-05-16 Thread Bill Lawrence
Assume UL 508A

Marking is:


-Original Message-
From: MIKE SHERMAN 
Sent: May 15, 2024 10:38 PM
To: 
Subject: Re: [PSES] SCCR Rating Question

Brian —
 
I am equally mystified by qualifying an SCCR with a voltage. Perhaps you could 
network into a friendly UL 408a panel shop and see what they say.  


Mike Sherman 
Sherman PSC LLC
On 05/15/2024 9:05 AM -05 Brian Kunde  wrote:
 
 
I appreciate the replies, but I am not getting the information I am seeking.  
Some machines have just the SCCR Rating, such as 
 
SCCR: 10kA
 
but a few machines we have looked at include a reference to the "Max Voltage", 
such as
 
SCCR: 10kA RMS Symmetrical, 480V Maximum
 
What 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 
<0220f70c299a-dmarc-requ...@listserv.ieee.org 
(mailto:0220f70c299a-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 mailto: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 mailto:rmm.priv...@gmail.com)> 
Sent: Tuesday, May 14, 2024 11:41 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG (mailto: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 (mailto: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

2024-05-15 Thread Ralph McDiarmid
I suggest that John has “nailed it”, as he often does.

 

Ralph

 

From: John Woodgate  
Sent: Wednesday, May 15, 2024 7:26 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] SCCR Rating Question

 

I cant help you with a reference to a standard, but there is a language problem 
and I think I can help with that, in the context of 'confusion'. The 'SSCR 
voltage' on the nameplate  actually means  'Minimum permitted value of the 
Maximum voltage of the SSCR'. Obviously those words are too long to put on the 
nameplate. In your case, obviously, the Max voltage of the SSCR must be at 
least 480 V if the motor is wired for 480 V operation, but could be lower if 
it's wired for a lower voltage. To document this, you  would need a BIG 
nameplate. Some standards allow a sign, usually a '!', to mean 'Refer to 
manual' or words to that effect, where you can put a full explanation.

On 2024-05-15 15:05, Brian Kunde wrote:

I appreciate the replies, but I am not getting the information I am seeking.  

 

Some machines have just the SCCR Rating, such as 

 

SCCR: 10kA

 

but a few machines we have looked at include a reference to the "Max Voltage", 
such as

 

SCCR: 10kA RMS Symmetrical, 480V Maximum

 

What 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 
<0220f70c299a-dmarc-requ...@listserv.ieee.org 
<mailto:0220f70c299a-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 mailto: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 mailto:rmm.priv...@gmail.com> > 
Sent: Tuesday, May 14, 2024 11:41 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG <mailto: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 <mailto: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

2024-05-15 Thread MIKE SHERMAN


 
 
  
   Brian —
   
  
    
   
  
   I am equally mystified by qualifying an SCCR with a voltage. Perhaps you could network into a friendly UL 408a panel shop and see what they say. 
   
   
   
  
   Mike Sherman 
   
  
   Sherman PSC LLC
   
   
   
On 05/15/2024 9:05 AM -05 Brian Kunde  wrote:

   
 

   
 

   
I appreciate the replies, but I am not getting the information I am seeking.  

  
 

 Some machines have just the SCCR Rating, such as 
 

  
 

 SCCR: 10kA
 

  
 

 but a few machines we have looked at include a reference to the "Max Voltage", such as
 

  
 

 SCCR: 10kA RMS Symmetrical, 480V Maximum
 

  
 

 What 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 <0220f70c299a-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 AMTo: EMC-PSTC@LISTSERV.IEEE.ORGSubject: 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 AMTo: EMC-PSTC@LISTSERV.IEEE.ORGSubject: [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 


  


  

   
  
   
   
  This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, 

Re: [PSES] SCCR Rating Question

2024-05-15 Thread John Woodgate
I cant help you with a reference to a standard, but there is a language 
problem and I think I can help with that, in the context of 'confusion'. 
The 'SSCR voltage' on the nameplate  actually means  'Minimum permitted 
value of the Maximum voltage of the SSCR'. Obviously those words are too 
long to put on the nameplate. In your case, obviously, the Max voltage 
of the SSCR must be at least 480 V if the motor is wired for 480 V 
operation, but could be lower if it's wired for a lower voltage. To 
document this, you  would need a BIG nameplate. Some standards allow a 
sign, usually a '!', to mean 'Refer to manual' or words to that effect, 
where you can put a full explanation.


On 2024-05-15 15:05, Brian Kunde wrote:
I appreciate the replies, but I am not getting the information I am 
seeking.


Some machines have just the SCCR Rating, such as

*SCCR: 10kA*

but a few machines we have looked at include a reference to the "Max 
Voltage", such as


*SCCR: 10kA RMS Symmetrical, 480V Maximum*

What 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 
<0220f70c299a-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  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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Re: [PSES] SCCR Rating Question

2024-05-15 Thread Brian Kunde
I appreciate the replies, but I am not getting the information I am
seeking.

Some machines have just the SCCR Rating, such as

*SCCR: 10kA*

but a few machines we have looked at include a reference to the "Max
Voltage", such as

*SCCR: 10kA RMS Symmetrical, 480V Maximum*

What 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 <
0220f70c299a-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  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
>>
>>
>>
>>
>> --
>>
>> This message is from the IEEE Product Safety Engineering Society emc-pstc
>> discussion list. To post a message to the list, send your e-mail to
>> EMC-PSTC@LISTSERV.IEEE.ORG
>>
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>> <https://www.mail-archive.com/emc-pstc@listserv.ieee.org/%20>
>>
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>> To unsubscribe from the EMC-PSTC lis

Re: [PSES] SCCR Rating Question

2024-05-14 Thread 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
>
>
>
>
> --
>
> This message is from the IEEE Product Safety Engineering Society emc-pstc
> discussion list. To post a message to the list, send your e-mail to
> EMC-PSTC@LISTSERV.IEEE.ORG
>
> All emc-pstc postings are archived and searchable on the web at:
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> <https://www.mail-archive.com/emc-pstc@listserv.ieee.org/%20>
>
> Website: https://ewh.ieee.org/soc/pses/
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> discussion list. To post a message to the list, send your e-mail to
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&

Re: [PSES] SCCR Rating Question

2024-05-14 Thread 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 <mailto: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

2024-05-14 Thread 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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