Hi Curtis,
It was listed to UL 60950.
--- On Wed, 5/13/09, Bender, Curtis <[email protected]> wrote:
From: Bender, Curtis <[email protected]>
Subject: RE: NRTL Mark vs. NEC Inspector
To: [email protected], [email protected]
Date: Wednesday, May 13, 2009, 8:02 AM
Christine,
What standard was your projector tested to? Is it double insulated? If
you
used UL 1492 is pretty clear for your dead metal part even during servicing:
"55.3 Accessible conductive parts
55.3.1 For a product not identified as being double-insulated, all
accessible
conductive parts that are likely to become energized from within and all
dead-metal parts within the enclosure that are exposed to contact during any
user-servicing operation and that are likely to become energized shall be
connected to the grounding means that shall be a part of the flexible cord and
attachment plug, or the detachable power-supply cord."
Curtis
______________________________________________________
Curtis Bender | [email protected]
Opinions expressed here are my own and do not reflect those of my
complyeer
________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of
Christine
Rodham
Sent: Wednesday, May 13, 2009 10:38 AM
To: [email protected]
Subject: Re:NRTL Mark vs. NEC Inspector
List Members,
We have an interesting problem. We sold an OEM product ( very high end Home
Theater Movie Projector , better than a movie theater quality) which was
listed by a well known NRTL. ( We modify and enhance the SW for high end
performance)
The projector was installed in a public place and the installation was
evaluated by a NEC ( National Electrical Code ) inspector.
The projector has a metal ungrounded heat sink attached to the chassis that
was added for cooling but was evaluated and approved by the NRTL.
The NEC inspector will not sign off on the installation stating non-current
carrying exposed metal parts that may be accidentally energized must be
grounded to the chassis. Grounding the heat-sink to the chassis will be
difficult due to the design of this special aluminum heat-sink.
Here are my questions:
* What is the criteria to determine if a metal part can become accidentally
energized?
The only way it could happen in this case is if the power cord that is near
the heat-sink is
damaged and then touches the heat-sink. The power cord is UL approved and
properly
rated.
* How many fault conditions ( single vs multiple ) are considered to determine
if a metal part can become accidentally energized.
* What would be our best option in arguing this ruling. Should we request
another inspector or get the NRTL involved?
Note that this unit is ceiling mounted and only trained service people would
have access to it after the initial installation.
Thank you!
Christine Rodham
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