Jim,
I took a few quick measurements of workboxes, isolation transformers, etc.
in the lab, as well as the knockout openings in the cast housings of some of
our flow transmitters.
7/8" and 1 1/8" seem to be the most common for the smaller circuits, with 2
3/8" and 2 3/4" used for the heavier stuff. Check a Hubbell catalog for
required sizes for cable grips, etc.
Scott Lacey
-----Original Message-----
From: Jim Eichner [SMTP:[email protected]]
Sent: Wednesday, October 06, 1999 5:49 PM
To: 'EMC-PSTC - forum'
Subject: RE: EN60950 - conduit entry dimensions
I have received very little response to this one, so I thought I'd
post
it again.
Aren't there any permanently connected ITE equipment mfr's on this
forum?! What do you provide in the way of knockouts or ...???
Thanks,
Jim Eichner
> Senior Regulatory Compliance Engineer
Statpower Technologies Corporation
[email protected]
http://www.statpower.com
Any opinions expressed are those of my invisible friend, who really
exists. Honest.
> -----Original Message-----
> From: Jim Eichner [SMTP:[email protected]]
> Sent: Thursday, September 23, 1999 10:49 AM
> To: 'EMC-PSTC - forum'
> Subject: EN60950 - conduit entry dimensions
>
>
> Greetings all: In clause 3.2.2 allows the provision of knockouts,
> cable
> entries, etc. in lieu of a non-detachable power cord for
permanently
> connected equipment. In Table 10, it lists the overall diameter
of
> conduit based on the number of conductors involved, up to 16A.
>
> In my particular application, there are 2 wires plus earth, and
the
> current (and the branch circuit protection) is less than 16A, so
the
> table tells me I need a knockout that can accommodate a 16.0mm
O.D.
> conduit. If things are done there anything like they are done
here,
> this 16mm conduit will be secured in a fitting of some sort, and
the
> knockout needs to be matched to the fitting, not the conduit (i.e.
a
> 16mm hole is likely too small).
>
> Is there a reference, or can anyone tell me, what the appropriate
> sized
> hole will be? Is this standardized somewhere?
>
> Thanks in advance for your help,
>
>
> Jim Eichner
> > Senior Regulatory Compliance Engineer
> Statpower Technologies Corporation
> [email protected]
> http://www.statpower.com
> Any opinions expressed are those of my invisible friend, who
really
> exists. Honest.
>
>
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