NEC 110.31 Fence 10 feet away

[IPS]

Hi All,

Is there a way to get around NEC 110.31's requirements, namely those contained in Table 110.31? My piece of equipment > 600Vdc but is enclosed. I understand the need to comply with 110.31 during maintenance, but is there a way to put the fence closer, for example by having it grounded?

Thanks,

 

[petersonra]

Hi All,

Is there a way to get around NEC 110.31's requirements, namely those contained in Table 110.31? My piece of equipment > 600Vdc but is enclosed. I understand the need to comply with 110.31 during maintenance, but is there a way to put the fence closer, for example by having it grounded?

Thanks,

Not that I can see.

I would point out that in the 2017 NEC the table starts at 1000 Volts, so if you are under 1000 Volts the table would not appear to be applicable.

 

[IPS]

NEC 2014 Table 110.31

NEC 2014 Table 110.31

OK, thanks. So, if I understand correctly, per NEC 2014:

if we need a fence either per:
i) battery manufacturer, i.e., not made intrinsically safe (tight ventilation, exposed nuts and bolts cannot be readily removed...), or per
ii) AHJ (for aesthetic reasons),

this fence has to comply with NEC 2014 Table 110.31 if V>600V, i.e., we need to place it at least 10' away from any live parts (energized conductive components) >600V. This means that, the fence needs to be placed at least 10' away from any battery equipment door that could be open to expose live parts with V>600V during maintenance.

Does this sound right?

Thanks!

PS: But what does 'exposed nuts and bolts cannot be readily removed' mean? custom screws or just tightened normal screws?

 

[Adamjamma]

In Jamaica they require security screws for those spots rather than what you find in standard screwdriver set...