Re: [PSES] SCCR of an electrical cabinet

[Douglas E Powell]

I am presently certifying my product to a different UL standard, and I
believe my situation is similar.  I have a 200 Amp three-phase circuit
breaker on the power input, rated for 25 kAIC. This will become the SCCR
for the overall product, and it will be marked on the rating plate as well
as in the user manual. Doing it this way puts the onus on the system
installer to provide a service that does not exceed this rating.

Thanks, Doug

Douglas E Powell
Laporte, Colorado USA
doug...@gmail.com
http://www.linkedin.com/in/dougp01


On Thu, Jun 3, 2021, 5:30 AM Víctor Ostíbar  wrote:

> Dear members:
>
> My company is developing machinery for the USA market and we are having
> contact with UL508A.
>
>
>
> According to the standard, the label must contain the SCCR of the cabinet
> in order to avoid the connection to a mains that can deliver higher
> currents in case of short circuit. The supply terminals of are connected
> directly to a transformer and the method provided by the standard states 
> *“Power
> transformers, reactors, current transfomers, dry-type capacitors,
> resistors, varistors, and voltmeters are not required to have a short
> circuit current rating”*.  Having into account that the transformer is
> the only component in the primary side. How can we determine the SCCR of
> our equipment?? We determined the SCCR of the secondary side following the
> standard but I’m stuck with the primary side.
>
>
>
> I’m thinking about put an infinite SCCR value but perhaps I’m being a bit
> optimistic.
>
>
>
> I hope someone can give us any guidance.
>
>
>
> Thank you very much in advance!!
>
>
>
>
>
>
>
> *Víctor Ostíbar*
> *Product Compliance*
>
> vosti...@meler.eu
> Tel. +34 948 68 19 31
>
>
>
>
>
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discussion list. To post a message to the list, send your e-mail to 


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Attachments are not permitted but the IEEE PSES Online Communities site at 
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used 
formats), large files, etc.

Website:  http://www.ieee-pses.org/
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List rules: http://www.ieee-pses.org/listrules.html

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Scott Douglas 
Mike Cantwell 

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David Heald: 

[PSES] SCCR of an electrical cabinet

[Víctor Ostíbar]

Dear members:

My company is developing machinery for the USA market and we are having contact 
with UL508A.

According to the standard, the label must contain the SCCR of the cabinet in 
order to avoid the connection to a mains that can deliver higher currents in 
case of short circuit. The supply terminals of are connected directly to a 
transformer and the method provided by the standard states "Power transformers, 
reactors, current transfomers, dry-type capacitors, resistors, varistors, and 
voltmeters are not required to have a short circuit current rating".  Having 
into account that the transformer is the only component in the primary side. 
How can we determine the SCCR of our equipment?? We determined the SCCR of the 
secondary side following the standard but I'm stuck with the primary side.

I'm thinking about put an infinite SCCR value but perhaps I'm being a bit 
optimistic.

I hope someone can give us any guidance.

Thank you very much in advance!!



Víctor Ostíbar
Product Compliance

vosti...@meler.eu
Tel. +34 948 68 19 31





Este mensaje se dirige exclusivamente al destinatario identificado, y puede 
contener información confidencial sometida a secreto profesional, o cuya 
divulgación esté legalmente prohibida. Si ha recibido este mensaje por error, 
le rogamos nos lo comunique de forma inmediata por esta misma vía y proceda a 
su eliminación, así como a la de cualquier documento adjunto al mismo, 
advirtiéndole que no está autorizado a utilizar, revelar, distribuir, divulgar, 
imprimir, copiar o realizar ningún tipo de acción sobre todo o parte de la 
información contenida en el mensaje. Se declina cualquier responsabilidad de 
Focke Meler Gluing Solutions, S.A. derivada de cualquier cambio realizado en el 
contenido del mensaje tras su envío.

This e-mail is addressed exclusively to the recipient and may contain 
privileged information under a professional confidential agreement or it may be 
against the law to disclose its contents. If you receive this e-mail in error, 
please let us know immediately (by return e-mail) and proceed to its 
destruction, as well as any document attached to it, since you are not 
authorized to execute any action, use, disclose, distribute, print or copy all 
or part of the contained information. Focke Meler Gluing Solutions, S.A. is not 
responsible for changes made to this message after it was sent.




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discussion list. To post a message to the list, send your e-mail to 


All emc-pstc postings are archived and searchable on the web at:
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Attachments are not permitted but the IEEE PSES Online Communities site at 
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used 
formats), large files, etc.

Website:  http://www.ieee-pses.org/
Instructions:  http://www.ieee-pses.org/list.html (including how to unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html

For help, send mail to the list administrators:
Scott Douglas 
Mike Cantwell 

For policy questions, send mail to:
Jim Bacher:  
David Heald: