Hi Bostjan!
You might be able to use 60950 or (UL1012?) anyway; I know the scope says
"Mains or Battery powered up to 600V", but I think the focus of that limit
(vs the 1000V limit in the LVD for example) might be on just Mains powered
circuits, because 600V is the delineation point between "Low Voltage" and
"high voltage" per the National Electrical Code.

On the other hand, I believe the spacing calculations go higher than 600V
in 60950 because internal voltages can go much higher than the supply
voltage (boost stages in a SMPS, inverters for CCFL tubes, HV supply for
corona wire in a laser printer, TV flyback, etc).

Would 61010 work?

-Ken A

On Wed, Sep 21, 2016 at 12:09 AM, Boštjan Glavič <bostjan.gla...@siq.si>
wrote:

> 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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