SomeRandomPerson
Member
- Location
- Massachusetts
- Occupation
- Electrician
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This is how I understand a res service is done. If the MBJ in the main panel is removed, I’d have to isolate grounds and neutrals correct?
- Thread starter SomeRandomPerson
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- Location
- Bremerton, Washington
What code cycle are you on?
SomeRandomPerson
Member
- Location
- Massachusetts
- Occupation
- Electrician
2020 in MA.
I’m a green apprentice trying to put it altogether with the new service disconnect/emergency disconnect requirements
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ptonsparky
Tom
- Occupation
- EC - retired
Not quite. Try again.
SomeRandomPerson
Member
- Location
- Massachusetts
- Occupation
- Electrician
Well I thought with SEU, there was no GEC from meter main to be brought to the panel unless it was in pipe..
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ptonsparky
Tom
- Occupation
- EC - retired
You added information in the second post that’s relevant.
SomeRandomPerson
Member
- Location
- Massachusetts
- Occupation
- Electrician
The SEU is relevant for sure. Today was only my second residential service change and I’m told it was simpler before the 2020 code cycle.
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jaggedben
Senior Member
- Location
- Northern California
- Occupation
- Solar and Energy Storage Installer
I'm going to assume that the meter main is your new 'emergency disconnect' to meet 230.85. And that you will be labeling it 'not service equipment' and have no distribution there. Otherwise, the SEU would not be allowed. (Prior to the 2020 code, it would not be allowed.)
In this case your 'service equipment' is the panel on the right, and your main bonding jumper stays there because the MBJ is always at the 'service equipment'.
The NEC allows those GECs to be anywhere in your drawing. Your local traditions or utility expectations may vary from the NEC.
Note: if my assumption is wrong, and the new meter main is supposed to be new service equipment, then the SEU must be replaced with SER or another method with an EGC, and your water main GEC must be moved to the meter main. In this case, the MBJ in the panel on the right must be removed, and the grounds and neutrals must be separated in that panel with the neutrals isolated from the enclosure.
In this case your 'service equipment' is the panel on the right, and your main bonding jumper stays there because the MBJ is always at the 'service equipment'.
The NEC allows those GECs to be anywhere in your drawing. Your local traditions or utility expectations may vary from the NEC.
Note: if my assumption is wrong, and the new meter main is supposed to be new service equipment, then the SEU must be replaced with SER or another method with an EGC, and your water main GEC must be moved to the meter main. In this case, the MBJ in the panel on the right must be removed, and the grounds and neutrals must be separated in that panel with the neutrals isolated from the enclosure.
ptonsparky
Tom
- Occupation
- EC - retired
Which panel is the Service Entrance?
- Occupation
- Licensed Electrician
All your Grounding Electrode Conductors go to the same spot as the Main Bonding Jumper.
- Location
- Bremerton, Washington
What you need to determine is which is the service disconnect. That is where the GECs terminate and where the MBJ goes
- Location
- Bremerton, Washington
We were posting at the same time…
SomeRandomPerson
Member
- Location
- Massachusetts
- Occupation
- Electrician
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
MUst all GECs land in the same location? Or can several GECs land at different allowed locations?
Jon
romex jockey
Senior Member
- Location
- Vermont
- Occupation
- electrician
SomeRandomPerson
Member
- Location
- Massachusetts
- Occupation
- Electrician
May I ask why? The boss likes to use SEU between the meter main and the main panel inside the house. If it were in pipe between the meter main and the main panel I could see not using SEU but being new to all this, I thought this was the standard?
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romex jockey
Senior Member
- Location
- Vermont
- Occupation
- electrician
sure, any N&G normally become separate entities after the MBJ
and the MBJ is normally @ the first disco
~RJ~
SomeRandomPerson
Member
- Location
- Massachusetts
- Occupation
- Electrician
In this case they seem to like having the MBJ in the main panel and not separating grounds/Grounded conductor.
I need to get a Soares book and dig into this.
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- Location
- New Jersey
- Occupation
- Journeyman Electrician
Are you on the 2020 NEC? IMO the meter main should be where the service disconnect is. Prior to the 2020 NEC you would not have the option to use the panel as the service disconnect.
SomeRandomPerson
Member
- Location
- Massachusetts
- Occupation
- Electrician
We are in the 2020 NEC in Massachusetts. Meter main outside, main panel is inside, usually a basement
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