Re: [PSES] Multiple electrical power sources

[Douglas Powell]

Although related to the installation of products and not necessarily the
product desgins themselves, you might review NFPA 70, National Electric
Code.  They do have requirements when using multiple sources.

-Doug


Douglas E Powell
Laporte, Colorado USA
doug...@gmail.com
LinkedIn 

(UTC -06:00, US-MDT)




On Thu, Apr 6, 2023 at 2:41 PM Steve Brody  wrote:

> A new question.
>
> A client's product is using two independent AC power sources on a product,
> but I can't find anything in 61010-1 60204-1 that provide any guidance on
> compliance.
>
> The obvious is that the sections of the product that are fed from source A
> or B are not interrelated in any way that would create a hazard for for the
> other section, that there be a warning label adjacent to each input that
> says there are multiple AC sources, and that each section has it's own
> circuit protection and disconnect, even if a facility disconnect is used
> for both.
>
> What am I missing?
>
> Thanks,
>
>
> Steve Brody
> sgbr...@comcast.net
> C - 603 617 9116
> -
> 
>
> This message is from the IEEE Product Safety Engineering Society emc-pstc
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> emc-p...@ieee.org>
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-

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Re: [PSES] Multiple electrical power sources

[Dan Roman]

And in the telecom world we frequently used multiple AC cords, each one going 
to an outlet served by a different circuit breaker to make sure the switch or 
multiplexer did not go down.  They fed individual power supplies that fed a 
common power bus.  Covered by IEC 950 and later standards.  Needed a warning 
that there were multiple power cords.  Seems odd that IEC 950 and derivatives 
would cover this situation but not 61010!

 

Dan

 

 

From: Richard Nute [mailto:ri...@ieee.org] 
Sent: Thursday, April 6, 2023 8:15 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Multiple electrical power sources

 

 

 

Hi Steve:

 

The TV broadcast industry electronic products have used two (redundant) AC 
sources for their products for many years.  You may have some help there.

 

Rich

 

 

From: Steve Brody mailto:sgbr...@comcast.net> > 
Sent: Thursday, April 6, 2023 1:42 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG  
Subject: [PSES] Multiple electrical power sources

 

A new question. 

 

A client's product is using two independent AC power sources on a product, but 
I can't find anything in 61010-1 60204-1 that provide any guidance on 
compliance. 

 

The obvious is that the sections of the product that are fed from source A or B 
are not interrelated in any way that would create a hazard for for the other 
section, that there be a warning label adjacent to each input that says there 
are multiple AC sources, and that each section has it's own circuit protection 
and disconnect, even if a facility disconnect is used for both. 

 

What am I missing? 

 

Thanks, 

 

 

Steve Brody 

sgbr...@comcast.net   

C - 603 617 9116 

 

-


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