Touch potential calculations/test

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lielec11

Senior Member
Location
Charlotte, NC
Occupation
Electrical Engineer (PE)
Anyone know what type of calculations are involved for a touch potential test? Client of mine had a requirement come across their desk and I've never performed anything like that. Now I am curious as to what is actually involved in the calculations and field tests in determining the touch voltages.
 
Earthing of power installations exceeding 1 kV a.c,
BS EN 50522/2010 or IEC/CENELEC EN 50522/2010(E) Annex H.
For indoor or outdoor installations.[ See ch.1 Scope for what is considered by this standard as electrical power installation.]
For substation outdoor installations:
IEEE Std 80-2013
IEEE Guide for Safety in AC Substation Grounding
19.2 Field survey of potential contours and touch and step voltages
 
I wonder whether NEC requires any touch potential calculation/test. I believe it does not.
 
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I don't believe so but it was listed as a requirement from the local utility company for this specific project. To be honest it's the first I've seen for a traditional 15kV-480V step-down indoor switchgear.
 
Then the local utility company may be approached for a model touch potential calculation and test procedure because it is their requirement.
 
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