I know this is going to be a can of worms, but I think that this could be a generally useful thread if people provide good responses. So here goes...
I have some questions about grounding with regards to using a rotary phase converter, a transformer fed by a subpanel.
In my case, I have a subpanel with a grounding rod that is tied/bonded to the ground line run from the main panel. The neutral is only bonded to ground in the main panel and is run to the subpanel, but not bonded to ground in the subpanel.
From the subpanel, I have a 240V (about 246V on average) single phase run to my RPC (rotary phase converter). The output from the RPC is 3ph 240V, which I run to my low voltage 3ph machines, but also I run the 240V into a 3ph delta-delta transformer to step it up to about 440V 3ph.
The questions I have are in regards to grounding for the RPC and transformer.
Should I provide another grounding rod that I tie/bond to the ground from the subpanel?
Should I bond the low voltage side and high voltage side ground wires all together and bond it to the transformer frame and the RPC motor frame and bond it to a local grounding rod?
I know a number of people that are suspicious of grounding and never attach the ground wires for 3ph machines.
I have some questions about grounding with regards to using a rotary phase converter, a transformer fed by a subpanel.
In my case, I have a subpanel with a grounding rod that is tied/bonded to the ground line run from the main panel. The neutral is only bonded to ground in the main panel and is run to the subpanel, but not bonded to ground in the subpanel.
From the subpanel, I have a 240V (about 246V on average) single phase run to my RPC (rotary phase converter). The output from the RPC is 3ph 240V, which I run to my low voltage 3ph machines, but also I run the 240V into a 3ph delta-delta transformer to step it up to about 440V 3ph.
The questions I have are in regards to grounding for the RPC and transformer.
Should I provide another grounding rod that I tie/bond to the ground from the subpanel?
Should I bond the low voltage side and high voltage side ground wires all together and bond it to the transformer frame and the RPC motor frame and bond it to a local grounding rod?
I know a number of people that are suspicious of grounding and never attach the ground wires for 3ph machines.