Hello Jim,
I don't believe the orientation of the U-ground pin is declared anyplace
in the NEC. When I recently approached my local AHJ with this question he
related that it is a matter of custom (locality dependent). In this area,
central Connecticut, the custom is:
For commercial/industrial applications, U-Ground topmost
For household wiring, U-Ground towards the bottom
The rationale offered for the U-Ground topmost; if the plug partially
separates from the outlet, anything falling into the opening between the
plug and the outlet will first encounter the grounding pin. (seems to me
that argument holds whether the use is commercial/industrial or
household).
Re dimensions of the outlet; send me your fax # and I'll fax you the
dimensions.
Regards, Art Michael
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-------------------------------------------------------------------
On Fri, 19 Jul 2002, Jim Eichner wrote:
>
> A couple of questions about our standard North American 120Vac socket:
>
> 1. Orientation: We have lots of people in the office here on both sides of
> this one, and I can't find a normative reference in the CEC or the NEC.
> Which is the correct way "up" when installing a socket on a wall - ground
> pin above the L and N blades, or L and N above the ground? What is the code
> reference for this requirement, or is there none?
>
> 2. Dimensions: Can anybody share the spec's for the dimensions, with
> tolerances, of the line, neutral, and ground blades for this configuration?
> I'm sure it's in the UL and CSA standards but I don't want to spend hundreds
> of $ for a one-time question. We have no on-going need for these standards!
>
> Thanks in advance for your help,
>
> Regards,
> Jim Eichner, P.Eng.
> Manager, Engineering Services
> Xantrex Technology Inc.
> Mobile Power
> web: www.xantrex.com <http://www.xantrex.com>
> Any opinions expressed are accidental. I have none.
>
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