- Location
- Illinois
- Occupation
- retired electrician
There is no equipment grounding conductor between the transformer and the first OCPD. It is a supply side bonding jumper and is sized from Table 250.102(C)(1).
120/208v voltage troubleshooting
- Thread starter jklr
- Start date
- Location
- Illinois
- Occupation
- retired electrician
No matter where the system bonding jumper is installed, you need a supply side bonding jumper between the transformer and the first OCPD.
Strathead
Senior Member
- Location
- Ocala, Florida, USA
- Occupation
- Electrician/Estimator/Project Manager/Superintendent
This is the big difference between separately derived systems and services. More specifically systems where the transformer is installed indoors. The neutral must be bonded in the transformer and there must be a system bonding jumper from the transformer to the ground bar and enclosure of the main disconnect. There is an exception that applies to outdoor transformers, which brings them more in line with the way we do services.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
You can bond the transformer directly to the neutral, like with a service.
ptonsparky
Tom
- Occupation
- EC - retired
Yes. Then it needs a SSBJ to the panel when transformer is customer owned and in the building. (EGC is the the wrong term)
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
Tweakers stealing it because “it’s just a ground wire”…
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
You would be amazed at how many cell tower ground wires are cut off at the base, to a height of about 7-8’, they usually don’t bother fixing it because the next day, it’s gone again!