Hello forum,
Had a question, we're installing HRG units on delta 480V transformers in our plant. These have zig-zag transformers built-in. Our 480V switchgear is attached to our step-down 12.47kV/480V transformers, which is also attached to the 15kV switch. We've verified that on each concrete pad that has the switch, transformer, and switchgear, there's a bare 4/0 copper wire that eventually connects to building steel. The switch, transformer, and switchgear are bonded together. My question is should we connect the ground side of the HRG resistor to building steel? Or should we bond it to the switchgear which then eventually connects to building steel? Or does it matter? Thanks
Had a question, we're installing HRG units on delta 480V transformers in our plant. These have zig-zag transformers built-in. Our 480V switchgear is attached to our step-down 12.47kV/480V transformers, which is also attached to the 15kV switch. We've verified that on each concrete pad that has the switch, transformer, and switchgear, there's a bare 4/0 copper wire that eventually connects to building steel. The switch, transformer, and switchgear are bonded together. My question is should we connect the ground side of the HRG resistor to building steel? Or should we bond it to the switchgear which then eventually connects to building steel? Or does it matter? Thanks