If this is for European approval, one may simply use EN 60950 and make up a 
Technical construction
file listing the essential differences. A decent (now mandatory anyway) risk 
analysis would cover these differences, showing up as in individual risks. You 
may then choose to extrapolate 6950 values, or seek another standard covering 
high voltage aspects to cover for these risks. 
I think that this would be acceptable to any international body, as long as the 
risks remain well covered.

Regards,

Ing. Gert Gremmen
Approvals manager
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From: Boštjan Glavič [mailto:bostjan.gla...@siq.si] 
Sent: Wednesday 21 September 2016 06:10
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] standard for power suply for server room.

Dear experts I again need your opinion on below issue.

Customer was asked for development of power supply which will be used to supply 
a  server in data centre. Input to power supply is defined as 750VDC. 
Unfortunately no information is available how this DC supply voltage is 
generated and reference to PE. Most probably it will be floating.

Now the problem, what standard to use for such product?

- Standard IEC 60950-1 which is most often used is limited to 600V rated 
voltage. Does it mean 600VRMS? Is it then allowed to approve also products with 
600xsqrt(2)=848VDC  rated voltage according IEC 60950-1 or limit is also set to 
600VDC? Where this limit actually comes from? If you check requirements for 
clearance and creepage distance they go quite higher than 600V.
- Standard IEC 62477-1 could be appropriate standard however problem is that 
this standard is not worldwide harmonised and therefore no national 
certificates (US/CAN, China) are possible based on report according to this 
standard
- What other standard would be OK for US/CAN?

I appreciate your feedback.

Best regards,
Bostjan

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