Re: Definition of accessible terminals

[emc-p...@ieee.org]

In message 
, 
dated Fri, 20 Jan 2006, iun...@servomex.com writes

>Are terminals on the rear of equipment intended to be rack mounted 
>considered to be 'accessible' under electrical safety standards such as 
>EN 61010-1, or its North American equivalents?

The problem with 'such as' and 'North American equivalents' is that 
individual standards vary in detail which may or may not be critical for 
your product.

The best thing to do, if you can, is to put any terminals that may 
present a shock hazard in a connector meeting relevant safety 
requirements. You may find IEC 61984 helpful in this context. It 
establishes safety requirements for all connectors that do not have a 
specific safety standard of their own.
-- 
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
2006 is YMMVI- Your mileage may vary immoderately.

John Woodgate

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Re: Definition of accessible terminals

[emc-p...@ieee.org]

Ian,
 
You need to consider that there are open racks, ie with covers and doors and
closed racks with keylock accessible only by service personnel. Also, even if
closed, you need to consider that these terminals may be interconnected to
other equipment that is user accessible and out of the control of your
equipment design.
 
Best Regards,
 
Peter
 


iun...@servomex.com wrote:

Dear Group,

Are terminals on the rear of equipment intended to be rack mounted
considered to be 'accessible' under electrical safety standards such as EN
61010-1, or its North American equivalents?

Many thanks in anticipation of your replies.

Ian Unwin
Servomex


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RE: Definition of accessible terminals

[emc-p...@ieee.org]

Ian,

Can the equipment only ever be used in a rack, which can be guaranteed to
provide restriction of access or interlocked operation? If the answer to all
of that is YES, then the terminals can be considered not accessible.

If, however, the equipment could be used on the bench, or could be installed
in a rack that doesn't totally exclude access or isn't interlocked, then the
answer is clearly that the terminals are accessible and you will need to
design accordingly.

Do not forget the concept of 'foreseeable misuse'. Unless you retain total
control over the equipment, then I think that the second scenario is the
more likely.

Best regards

Neil R. Barker CEng MIEE FSEE MIEEE
Manager
Compliance Engineering
e2v technologies (uk) ltd
106 Waterhouse Lane
Chelmsford
Essex CM1 2QU
UK

Tel: (+44) 1245 453616
Fax: (+44) 1245 453410
Mob: (+44) 7801 723735



From: iun...@servomex.com [mailto:iun...@servomex.com]
Sent: 20 January 2006 08:38
To: emc-p...@ieee.org
Subject: Definition of accessible terminals


Dear Group,

Are terminals on the rear of equipment intended to be rack mounted
considered to be 'accessible' under electrical safety standards such as EN
61010-1, or its North American equivalents?

Many thanks in anticipation of your replies.

Ian Unwin
Servomex

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This message is from the IEEE Product Safety Engineering Society
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Instructions:  http://listserv.ieee.org/request/user-guide.html

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For help, send mail to the list administrators:

 Scott Douglas   emcp...@ptcnh.net
 Mike Cantwell   mcantw...@ieee.org

For policy questions, send mail to:

 Jim Bacher: j.bac...@ieee.org
 David Heald:emc-p...@daveheald.com

All emc-pstc postings are archived and searchable on the web at:

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