codequestion
Banned
- Location
- MD, USA
Attached pdf shows grounding electrode at the generator which is non separately derived system. Is this okay for non separately derived system?
Non separately Derived System
- Thread starter codequestion
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jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
The extra electrode is fine. The EGC ties it to the building GES.
Key points are unswitched neutral in transfer switch and note 9 on the drawing.
No supply side bonding jumper at genny.
Separate EGC and neutral from genny to transfer switch.
Last edited:
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Not sure why someone would think that an extra ground rod or two would be a big improvement of the existing building GES.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Beats me, until I joined here I didn’t know that rods were being speced for pole lights now days.
Installed plenty of site lighting; never put one in, never been asked, never noticed if any others had them.
codequestion
Banned
- Location
- MD, USA
In your sketch their is no ground electrode but in mine their is. I am reading this correct extra electrode on the generator in pdf is ok as long as neutral and ground are not tied together at the generator?
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jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Yes. Code allows the extra ground rod, it is called an auxiliary. 250.54.
Yes, not tied at genny is important.
That connection is called the system bonding jumper, it occurs elsewhere for a non SDS set up.
In the picture/ graphic I posted, it is in the service disconnecting means.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Yes and the auxiliary rod gets connected to the generator frame/EGC bus not the neutral.
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