- Location
- Illinois
- Occupation
- retired electrician
Re: Separately Derived 3phase 3 wire System
Bennie,
Don
Bennie,
XO of each system is connected to ground at only one point, that point is where the main bonding jumper is installed for the service and where the bonding jumper is installed for the secondary of the transformer. While it is true that the XOs of both systems are tied together, that is not the same as bonding XO at multiple points. Additional connections to earth on the grounding system on the earth side of the bonding jumper are electrcially the same as supplementary grounding electrodes as permitted by 250.54.Connecting the X-O to two different ground points is in violation of the objectionable current code section.
Don