Main disconnect

[Nicksab]

I saw a remodel job today where the previous contractor left unfinished because he bankrupt

The main panel was left empty so it needs to be rewired.

There is 3 meters from the service drop. Each meter has it is own old 60A main disconnect.

After doing some calc, one of the main disconnect is not going to cut it. It needs an 100A.

Can 2 main disconnect remains at 60A and one at 100A or do they all need to be the same?

Also the main disconnect that needs to be changed is not grounded but the panel has ground and neutral connected. Is that correct?

Just asking because the 2 other main disconnect are grounded but the panel they serve have neutral and ground separate.

The neutral are connected to th GE at the meter

 

[Smart $]

The main disconnects can be whatever is the minimum required (or grandfathered if these are one-family dwelling units), as long as the service entrance conductor and taps thereof support the calculated load and to a degree the OCPD rating which is imposed upon them.

Neutral to EGS bond, aka main bonding jumper, is required to be located in the service disconnecting means enclosure(s).

 

[Nicksab]

The main disconnects can be whatever is the minimum required (or grandfathered if these are one-family dwelling units), as long as the service entrance conductor and taps thereof support the calculated load and to a degree the OCPD rating which is imposed upon them.

Neutral to EGS bond, aka main bonding jumper, is required to be located in the service disconnecting means enclosure(s).

That make sense for the main disconnected. Each one of them serves a different location with their related panel. ( 2 apartment and one office ) these 4 awg are history then to make room for the new 100A main disconnected

In regards to the ground, I am having a hard time trying to figure what they wanted to accomplish.

To recap, service panel ( meter ) have the neutral grounded to GE.

One main disconnected has neutral grounded to water line and serve a panel with a separate GE. Neutral and ground are kept separate in the panel with a 60 A main breaker

Another main disconnect has no ground at all and serve a panel with neutral and ground connected.

The third main disconnect seems to have neutral grounded but I haven't looked at the panel yet.

Is this setup correct? I feel something is wrong but ...... maybe I am just being paranoid and over thinking it. :jawdrop:

 

[Sierrasparky]

Personally I would change it all. I would not want to be responsible for stuff that old.

If the meter cans are bolted together as a assembly then 1 location to run the GEC. If separate services , separate risers then I would see the need to bring the GEC to each and bonding Jumper.

 

[Nicksab]

Personally I would change it all. I would not want to be responsible for stuff that old.

If the meter cans are bolted together as a assembly then 1 location to run the GEC. If separate services , separate risers then I would see the need to bring the GEC to each and bonding Jumper.

Agree. That stuff should be in a museum.

The 3 meters are in one assembly with one riser/service drop. One GEC is fine connected to neutral between service and main disconnect.
So having the neutral and ground connected in that panel is fine.

Still not sure though why they run an insulated 10 awg from the water pipe inside the building to the neutral lug on one of the main disconnect. This same main disconnect serve a panel with a separate GE and neutral/ground jumper removed.


I am planning on a 200 amp residential main panel with a 100 or 150 main disconnect but I need to double check the load first. The 4 awg would need to be upgraded to 3 or 2 awg depending on load from service to main disconnect to panel.