Neutral to EGC bonding at the origination of a Separately Derived System

I

Installer

Senior Member
Location
DesMoines, Washington
Does the Neutral have to be tied to the EGC at the Blue Arrow?
Did I make a mistake in my wiring?
Everything is working fine, but I'm told that the Neutral Bar in the Panel must be tied to the Ground Bus Bar in the Panel because that's where the separately derived system actually starts.
Since this is the origination point of the separately derived system, did I make a mistake?
Thank you in advance
n to g.png
 
The neutral must be tied to ground at one and only one location.

The blue arrow is a good location, and is also above the note telling you to do this.

Your other option is to bond neutral to ground in the transformer.
 
Any time someone states that you must do this or that, you should challenge them to show you the code. You are fine with it being there. 250.30 says:
"1752748835798.png

FYI, the green conductor between the transformer and the main disconnect is a system bonding jumper sized per 250.102, not an EGC per 250.122. This is also dictated in 250.30
 
Installer said:
Does the Neutral have to be tied to the EGC at the Blue Arrow?
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No. The SBJ can connected in the panel or in the transformer. I prefer installing it in the transformer but it can go in either location just not both. I've never installed the SBJ anywhere but the transformer.
 
Strathead said:
Any time someone states that you must do this or that, you should challenge them to show you the code. You are fine with it being there. 250.30 says:
"View attachment 2578711

FYI, the green conductor between the transformer and the main disconnect is a system bonding jumper sized per 250.102, not an EGC per 250.122. This is also dictated in 250.30
Click to expand...
The Green conductor between the transformer and the main disconnect is not a system bonding jumper, it should be a supply side bonding jumper.
 
infinity said:
No. The SBJ can connected in the panel or in the transformer. I prefer installing it in the transformer but it can go in either location just not both. I've never installed the SBJ anywhere but the transformer.
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It may go in both locations as long as there is no objectionable current produced on equipment. Installing the SBJ in two places essentially places the neutral conductor and grounding conductor in parallel with each other as current seeks its way back to the source. :)
 
infinity said:
Both or either? The code section in post 3 says "single point". Both would not be a single point.
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For the sake of linear thought and simplicity, I would say "either", and you are correct in the fact that both would not be a single point. But in actuality, it can both. I like to picture an overhead service to a house. The neutral is grounded to ground at the utility pole at the transformer location and then bonded at the first means of disconnect. The two connections are allowed because there is no EGC providing a parallel path in the aerial drop. I think that same logic can be applied to underground installs as well.
 
Installer said:
So do I need to tie the neutral to the ground bar? thanks

View attachment 2578718
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With all due respect, you need to be able to read and comprehend the code. I cited the code section in post number 3 that clearly states the connection can be made anywhere between the transformer and the system disconnect. When you take my word or anyone else's you are not going to the source, and you are not able to defend your work properly.
 
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