Work clearance in front of 13.8kV switchgear

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mshields

mshields

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Boston, MA
For a 13.8kV S&C fuse and switch, switchgear lineup, I'm allowing 5 feet of work space in front of the gear. This I'm basing on the fact that the "nominal voltage to ground" would be 13.8kV/1.73 or 7,976volts. As such, NEC Table 134(A) for condition 2 requires 5 feet of clear distance. I'm being challenged on this and just want to make sure this approach is correct.

Question number 2, the metering compartment has drawout PT's, do I need to allow more than 5 feet in front of it to account for this added depth when the carriage is drawn out?

Thanks,

Mike
 
Thanks Ron

Thanks Ron

I was pretty sure of myself on this one. But I'm being challened and I wanted to remove all doubt.

As far as your question is concerned, I'll find out. I see where you're going with that and I believe they would be de-energized.

thanks,

Mike
 
I agree with the approach you used to figure out the working clearance. May I ask what the challenger is saying?
 
mshields said:
For a 13.8kV S&C fuse and switch, switchgear lineup, I'm allowing 5 feet of work space in front of the gear. This I'm basing on the fact that the "nominal voltage to ground" would be 13.8kV/1.73 or 7,976volts. As such, NEC Table 134(A) for condition 2 requires 5 feet of clear distance. I'm being challenged on this and just want to make sure this approach is correct.

Question number 2, the metering compartment has drawout PT's, do I need to allow more than 5 feet in front of it to account for this added depth when the carriage is drawn out?

Thanks,

Mike
Click to expand...

Wouldn't the 'nominal voltage to ground' be determined by the grounding method used?
 
I have had utilities require 10' of clearance on a unit sub-station so that they could use hot sticks where the owner was metered at 15kV.

This was a local utility requirement though.

-Ed
 
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