NEC Table 110.31 for outdoor installations

[philly]

Does the requirements for minimum distance to live parts in Table 110.31 only apply to exposed energized equipment in an outdoor electrical installation, or would this also apply to switchgear enclosures?

I see many NEMA 3R switchgear enclosures located outdoors enclosed by a fence to prevent access from unqualified personnel. If the switchgear lineups have both front and rear access doors do the requirements of this table apply? Or since the energized parts are enclosed by the switchgear does this table not apply?

If the switchgear would never be opened while energized (Most MV Switchgear applications) could the stance be taken that there would never be exposed energized live parts and this this table would not apply?

 

[don_resqcapt19]

The second paragraph of the parent text says none of this applies where the equipment in question complies with 110.31(D).

 

[philly]

The second paragraph of the parent text says none of this applies where the equipment in question complies with 110.31(D).

Ok I see that now thanks. And to your point if the Switchgear is enclosed and doors are able to be locked to prevent access by unqualified personnel then 110.31 (D) is not applicable.

In the case that there is switchgear that does not mee 110.31 (D) or even if it does and there is a fence that encloses the switchgear would Table 110.31 be applicable if energized parts were behind switchgear doors?

Also do the working space and egress rules of 110.26 and 110.33 apply to outdoor installations or do these only apply to indoor installations?

 

[don_resqcapt19]

If the equipment is enclosed, then you apply the rule in 110.26 or 110.33 as required by the voltage for the location of the fence. 110.26(A) and 110.34(A) apply both indoors and outdoors.

 

[philly]

If the equipment is enclosed, then you apply the rule in 110.26 or 110.33 as required by the voltage for the location of the fence. 110.26(A) and 110.34(A) apply both indoors and outdoors.

Ok so if I understand correctly 110.31 would only apply to exposed energized conductors (substation bus, breaker/transformer terminals, etc..) but if equipment is enclosed then 110.31 would not apply however 110.26 or 110.33 would apply and the fence would be treated like a wall of the electrical room for determining required working space, egress, etc...? Do I have that right?

 

[don_resqcapt19]

Ok so if I understand correctly 110.31 would only apply to exposed energized conductors (substation bus, breaker/transformer terminals, etc..) but if equipment is enclosed then 110.31 would not apply however 110.26 or 110.33 would apply and the fence would be treated like a wall of the electrical room for determining required working space, egress, etc...? Do I have that right?

That is how I see it.