Folks, all of the information on NEMA sizes is moot since the original
question was regarding metric sizes - 16 mm in particular - used in Europe
and most elsewhere in the world. Any information on holes for metric
fittings would be appreciated.
----------
From: Bill Lawrence [SMTP:wlawr...@capecod.net]
Sent: Thursday, October 07, 1999 10:29 AM
To: Lacey,Scott; 'Jim Eichner'
Cc: 'emc-p...@ieee.org'
Subject: Conduit entry dimensions
Some dimensions for typical sizes of knockouts:
Nominal Size of Conduit Knockout Diameter
1/2 0.859 / 0.906
3/4 1.094 / 1.141
1 1.359 / 1.406
1 1/4 1.719 / 1.766
A source of the data is NEMA ICS 6.
Bill Lawrence - Factory Mutual Research
At 09:06 10/07/1999 -0400, Lacey,Scott wrote:
>
>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:jeich...@statpower.com]
> 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
> jeich...@statpower.com
> http://www.statpower.com
> Any opinions expressed are those of my invisible friend, who
really
> exists. Honest.
>
>
> > -----Original Message-----
> > From: Jim Eichner [SMTP:jeich...@statpower.com]
> > 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
> > jeich...@statpower.com
> > http://www.statpower.com
> > Any opinions expressed are those of my invisible friend,
who
>really
> > exists. Honest.
> >
> >
> > ---------
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> ---------
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>---------
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>
>
Bill Lawrence
South Yarmouth, MA 02664
wlawr...@capecod.net
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