General Beginner question on equipment grounding..

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angrymonkey

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Hello all,

I have a quick general question on grounding equipment pertaining to "opposite, diagonal corners" that you typically see.


What exactly is dictating the opposing corner grounding plates you typically see on a large percentage of equipment? Is this a blatant NEC requirement I have somehow missed?

Or is it more of a rule of thumb of sorts? Meaning, can code be fulfilled with just one connection but experience dictates a second connection for redundancy and protection in the case of damage problems?


For example, small transformers with a specification that contains the verbage:

"The base of the enclosure shall be furnished with ground pads located on opposite diagonal corners. "


You see this everywhere, so I am just making sure as to what pushes this aspect. Hopefully I am clear as I tend to ramble :D
 
only one connection is required.

the spec requiring two places to make the connection may be to insure there is a convenient place to do so.
 
The ground pad specifications are required by ANSI/IEEE,to insure there is an easy attachment point for a ground mat.



Stainless Steel Ground Pads: External Stainless steel ground pad with NEMA 2-hole lug pattern for convenient connection to customer substation ground mat. Pads have two 1/2"-13 threaded holes and are supplied with Stainless steel hex head bolts.



The Kri-Tech ground mat is designed to protect workers who come in contact or have the potential for electrical contact, by creating a zone of equi-potential. An equi-potential zone is a method of keeping the operators hands and feet at the same electrical potential.
Kri-Tech Ground Mats provide superior protection when field workers are engaged in the following operations:

Splicing cables in trenches on new or existing underground applications
Making cable terminations on transformers and in cubicles
Opening or closing overhead air breaks (cost savings can be realized when Kri-Tech Ground Mat is used to replace permanent ground grids)
Working on control boxes of regulators, reclosers, capacitors, pad mounted switches
 
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