Temporary Power Plant Bond

Michaelriordan

New User
Location
glendale, az
Occupation
Power generation manager
Hello,
I work in the temporary power industry and am seeking advice on our current power plant setup in California. We have eight 500 kW generators paralleled at an 8000 A paralleling cabinet. The output branches off into two 4000 A breakers, which feed two 2.5 MVA transformers stepping up the voltage from 480 V to 12,470 V.
My question is: Should we place the bond at the paralleling cabinet or at the transformers, rather than at the generators?
 
Better a late reply than never, and welcome to the forum. We'd need more context to give a good answer,
By 'power plant' you mean a portable temporary substation?
Is this a tractor-trailer with a prime mover generator & step up transformers that is vehicle mounted?
First you'd need to establish what codes like the NEC you need or want to follow.
For the NEC jurisdiction depends if its under exclusive control of an electric utility,
If such installation is not under the exclusive control of an electric utility and its powering a building or campus with 'customer owned' (non-utility) 12.5kV distribution is when parts of it may fall under the NEC as a temporary feeder.
But then some generation plant designers opt-in and follow the NEC for all similar systems like 240 - 600V and control wiring, even if its not a NEC jurisdiction, so you'd need to check what standards the POCO is using.
 
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