Inserting a service disconnect

[Electromatic]

I'm looking at relocating a 3Ø,4W service from overhead to underground. There is currently no outside disconnect. The service goes some distance inside the building in metallic conduit to a distribution panel. This is where the GES is connected. I'd like to add an outside disconnect as part of the service relocation but am not sure what to do about the main bonding. If I separate grounded and grounding conductors at the MDP, can the conduit serve to essentially extend the GEC to the outside disconnect where I would then have the main bonding jumper?

 

[augie47]

The metallic conduit can serve as you EGC between your outside disconnect and your panel once you separate the neutrals and EGs in the pane.
(250.97 might come into play if its over 250vtg)
The conduit can not serve as a GEC. You will need to connect the GES to the outside disconnect and have a MBJ there.

{There is a provision in 250.121 allowing a wire type EGC to serve as a GEC but there are restrictions such as 250.64(E)}

 

[don_resqcapt19]

If you place the service disconnect outside, the GEC(s) must connect there and you need an EGC between the service disconnect and the MDP.
Note that the original installation was never compliant as the service disconnect was not nearest the point of entrance of the service conductors...unless the conduit was encased in 2" of concrete