outer dimensions of standard NEMA receptacles

I was looking at the document that detailed the dimensions of NEMA standard receptacles (and plugs). One thing that was missing was what specific
dimensions were involved for the plate opening for larger receptacles. There was an indication that a number of opening sizes exist at as fine as 1/8 inch increments. That seems excessive.
Is there a standard for what plate opening size must be used with each class of receptacle? Or is this simply up to the manufacturer to choose a size that is adequate.
There were sizes for the common duplex and triplex plate openings, as well as for switch hole and decorator openings, as well as the inter-device spacing for multi-gang purposes.
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snipped-for-privacy@ipal.net wrote:

The Leviton catalogue, you can download it from their site, but you need a fast connection, it's big, shows the dimensions on page 500. Only two 'larger' sizes are listed:
2.15 inch (54.5mm)
2.57 inch (62.6mm)
There seem to be two different standards for the screw holes on the 2.15 inch plates:
Two holes, above and below the main opening, at 2.5 inch (63.5mm) centres.
Four holes arranged in a rectangle, at 1.81 inch (46mm) centres horizontally, and 2.38 inch (60.3mm) vertically.
On the 2.57 inch plates there only seems to be a four screw version, with the screw holes at the same spacing as on the four screw 2.15 inch plates.
The diameter of the screw holes is not specified.
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On 2 Oct 2006 10:25:13 -0700 snipped-for-privacy@mail.croydon.ac.uk wrote: | | snipped-for-privacy@ipal.net wrote: |> I was looking at the document that detailed the dimensions of NEMA standard |> receptacles (and plugs). One thing that was missing was what specific |> dimensions were involved for the plate opening for larger receptacles. |> There was an indication that a number of opening sizes exist at as fine |> as 1/8 inch increments. That seems excessive. |> |> Is there a standard for what plate opening size must be used with each |> class of receptacle? Or is this simply up to the manufacturer to choose |> a size that is adequate. | | The Leviton catalogue, you can download it from their site, but you | need a fast connection, it's big, shows the dimensions on page 500. | Only two 'larger' sizes are listed: | | 2.15 inch (54.5mm) | | 2.57 inch (62.6mm) | | There seem to be two different standards for the screw holes on the | 2.15 inch plates: | | Two holes, above and below the main opening, at 2.5 inch (63.5mm) | centres. | | Four holes arranged in a rectangle, at 1.81 inch (46mm) centres | horizontally, and 2.38 inch (60.3mm) vertically. | | On the 2.57 inch plates there only seems to be a four screw version, | with the screw holes at the same spacing as on the four screw 2.15 inch | plates. | | The diameter of the screw holes is not specified.
Thanks.
FYI, I'm coding this up in a technical graphing program to draw pictures of various layouts. I'm just wanting to make sure they are all correct by being derived from accurate numbers, instead of hand drawn to what appears to be similar.
Here is some of what I was drawing: http://phil.ipal.org/usenet/aee/2006-10-04/fourfaces.html http://phil.ipal.org/usenet/aee/2006-10-04/twelvefaces.html http://phil.ipal.org/usenet/aee/2006-10-04/updown.html http://phil.ipal.org/usenet/aee/2006-10-04/want.html
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