[PSES] SCCR of an electrical cabinet

2021-06-03 Thread 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<mailto:vosti...@meler.eu>
Tel. +34 948 68 19 31





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[PSES] Railway Earthing and Isolation Requirements - Rolling Stock and Trackside Equipment

2019-07-19 Thread Víctor Ostíbar
Dear James:

Insulation tests levels for rolling stock equipment are stated in EN 50155. 
Have in mind that there are two versions in force in this moment and there are 
some slight differences related with insulation tests. Creepage and clearances 
are defined in EN 50124-1.

I'm not familiar with infrastructure requirements but a review of the following 
list will help you 
https://ec.europa.eu/growth/single-market/european-standards/harmonised-standards/interoperability-rail-system_en

I hope it helps.

Have a nice weekend.


Víctor Ostíbar
Seuridad de producto / Product Safety

vosti...@meler.eu<mailto:vosti...@meler.eu>
Tel. +34 948 68 19 31

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destruction, as well as any document attached to it, since you are not 
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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 


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/
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