Bostjan

 

I would seriously consider pointing out to your customer that their specified 
supply voltage is not a common one (at all) and ask them to state in more 
detail the system configuration which will provide it, and then you should know 
more clearly what you are up against and how to deal with it. Mention that the 
voltage does not appear to coincide with any generally-known commercial level 
known to be found in Europe or N.America, and thus ask where it will be found - 
suspicion might fall on some other country &/or an end-use customer that has 
some very special equipment, and might also point you towards some national 
standard(s) that could be national variations on known international ones.

 

Ignorance is not a “crime” in cases like this where “something” is very unusual 
and where no-one here on this very experienced forum can provide any 
definitive, or even “educated”, guidance.

 

John E Allen

W.London, UK

 

From: Boštjan Glavič [mailto:bostjan.gla...@siq.si] 
Sent: 21 September 2016 05:47
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] standard for power suply for server room.

 

Hi Ken,

 

UL1012 has the same limitation as 60950-1. 

 

IEC 61010-1 is not OK since it is not a laboratory equipment or measuring 
equipment.

IEC 62477-1 has also limitation in the scope however limits are 1000Vac and 
1500VDC.

 

Best regards,

Bostjan

 

From: IBM Ken [mailto:ibm...@gmail.com] 
Sent: Wednesday, September 21, 2016 6:36 AM
To: Boštjan Glavič <bostjan.gla...@siq.si>
Cc: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] standard for power suply for server room.

 

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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