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From: emc-pstc@ieee.org on behalf of Grace Lin [gracelinnj@gmail.com]
Sent: Wednesday, June 20, 2007 10:12 AM
To: emc-pstc@ieee.org
Subject: Enclosure Openning
Dear Members,
I have to reply on your help for safety questions from our design
engineers.
Is there any safety requirement for an openning of an enclosure of a
module to be installed in a power panel? The module is for lighting
devices. The power panel is only accessible by authorized personnel.
I sincerely appreciate your input.
Best regards,
Grace Lin
Crestron Electronics, Inc.
www.crestron.com
-----
From: emc-pstc@ieee.org on behalf of Grace Lin [gracelinnj@gmail.com]
Sent: Wednesday, June 20, 2007 10:31 AM
To: emc-pstc@IEEE.ORG
Subject: Re: Enclosure Openning
The power rating is 277V single phase and 480V three phase.
-----
From: emc-pstc@ieee.org on behalf of Kunde, Brian [brian_kunde@lecotc.com]
Sent: Wednesday, June 20, 2007 10:31 AM
To: Grace Lin; emc-pstc@IEEE.ORG
Subject: RE: Enclosure Openning
Enclosures have several purposes. One is to restrict access to hazards
such has high voltage (I'm making some assumptions based on your email).
You may not want items to fall into your enclosure, such as loose
hardware or items that may drop down from above. You may also have to be
concerned with the fire enclosure. If your module requires a fire
enclosure and the Power Panel does not provide this protection, then
your enclosure will have to be designed as such. Air flow and cooling is
probably a consideration. If your module had hazardous voltages, you may
want the enclosure to minimized accidental contact by an authorized
person (service person)
The Other Brian
-----
From: emc-pstc@ieee.org on behalf of Grace Lin [gracelinnj@gmail.com]
Sent: Wednesday, June 20, 2007 10:51 AM
To: emc-pstc@ieee.org
Subject: Re: Enclosure Openning
Thank you, Brian.
Yes, the enclosure is to restrict access to hazards (277V) and to
protect what inside. Fire is not of great concerned according to our
engineer.
-----
From: emc-pstc@ieee.org on behalf of John Woodgate [jmw@jmwa.demon.co.uk]
Sent: Wednesday, June 20, 2007 11:03 AM
To: emc-pstc@IEEE.ORG
Subject: Re: Enclosure Openning
In message
<2a93eb060706200712k1910e810y279af15955d4099f@mail.gmail.com>, dated
Wed, 20 Jun 2007, Grace Lin <gracelinnj@gmail.com> writes:
>Is there any safety requirement for an openning of an enclosure of a
>module to be installed in a power panel? The module is for lighting
>devices. The power panel is only accessible by authorized personnel.
This sort of question can really only be answered if a lot more detail
is supplied. There are two main questions:
* - after it's been installed, is there an electric shock hazard?
* - after it's been installed, is there a fire hazard?
If either answer is 'yes', then an opening is not OK unless it complies
with restrictions on size and position.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
There are benefits from being irrational - just ask the square root of
2.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-----
From: emc-pstc@ieee.org on behalf of Grace Lin [gracelinnj@gmail.com]
Sent: Wednesday, June 20, 2007 1:19 PM
To: emc-pstc@IEEE.ORG
Subject: Re: Enclosure Openning
Hi John,
The module is installed in a power panel enclosure. The engineer and I
think it should have no electric shock hazard. I don't know how to
determine if there is a fire hazard. Please help.
Thanks,
Grace
-----
From: emc-pstc@ieee.org on behalf of John Woodgate [jmw@jmwa.demon.co.uk]
Sent: Wednesday, June 20, 2007 1:39 PM
To: emc-pstc@IEEE.ORG
Subject: Re: Enclosure Openning
In message <2a93eb060706201019w2ff97c86o4c986da01113867@mail.gmail.com>,
dated Wed, 20 Jun 2007, Grace Lin <gracelinnj@gmail.com> writes:
>The module is installed in a power panel enclosure. The engineer and I
>think it should have no electric shock hazard. I don't know how to
>determine if there is a fire hazard. Please help.
You have to look at what the applicable safety standard says about fire
hazards. Have you determined which safety standard applies? From what
you have written, the product may be 'lighting equipment', subject to
IEC/EN 60598-1 and maybe a section of IEC/EN 60598-2, or it could be
'switchgear and control gear', in which case IEC/EN 60439-1 would be
more relevant.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
There are benefits from being irrational - just ask the square root of
2.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-----
From: emc-pstc@ieee.org on behalf of peter merguerian [pmerguerian2001@yahoo.com]
Sent: Thursday, June 21, 2007 1:03 AM
To: Grace Lin; emc-pstc@ieee.org
Subject: Re: Enclosure Openning
For the US, looks like you have to comply with the opening requirements
in the industrial control panels standard,UL508A.
Best Regards,
Peter
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