Grounding Vintage 3 wire subpanel

[Jwilson9]

The existing old panel (to be replaced) has a combined ground-nuetral. I will temporarily run a separate ground line to the panel. Does the ground have to return to the main panel or can I connect it to the grounding rod which is closer.

 

[ActionDave]

Is this panel a part of the service? What is the level of your involvement as an engineer? Is there an electrician that will be doing the work?

 

[petersonra]

The existing old panel (to be replaced) has a combined ground-nuetral. I will temporarily run a separate ground line to the panel. Does the ground have to return to the main panel or can I connect it to the grounding rod which is closer.

The equipment grounding conductor (presumably that is what you are asking about) has to be run with the other circuit conductors. So that would preclude either running it separately or to the ground rod.

300.3(B) Conductors of the Same Circuit. All conductors of the
same circuit and, where used, the grounded conductor and all
equipment grounding conductors and bonding conductors
shall be contained within the same raceway, auxiliary gutter,
cable tray, cablebus assembly, trench, cable, or cord, unless
otherwise permitted in accordance with 300.3(B)(1)through
(B)(4).

 

[Little Bill]

@Jwilson9
Please answer ActionDave in post #2 with a PM, or any of the Mods. You can send a PM by hovering over a user name, when the pop-up appears, click on "Start conversation". We are not allowed to help with DIY work if you're not an electrician. I have to close this thread until we hear from you.