Service Cable to sub panel theory question.

[MdGNev]

Going to be running a sub panel underground 100+- ft to new steel building will be running a 2-2-2-2 Aluminum SER Cable. (Planning n 100amp svc even thought I doubt I will EVER need it.)

If the #2 SER Cable is
2 (+)
1 (-)
1(g)

Why am I running a ground all the way back to the panel?

Seems to me since I will need a rod at the building to ground from the sub panel, Couldn't I run a 2-2-2 Aluminum SER Cable 2+ and 1-

And meet the grounding needs for the sub panel with the local rod?

 

[littlespark]

We have lots of different words for the same thing between USA and UK

Hot - live
Earth - ground
Sidewalk - pavement
Donkey - ---
--- - bum
Bum - tramp
Donald Trump -..........

Well you get the idea

 

[Deleted member 26818]

Thanks.
I do think that your opening sentence is off course mate. How can my post not be true “at all” when your 2nd sentence repeats what I have said? adding your own spin, naturally. Just my opinion.

Ok, how about this:
It’s not the case that there must be a CPC, and that it has to be part of a cable containing the live conductors.
If it were the case, we would not be allowed separate tails, and we most certainly would not be allowed TT installations.

 

[static zap]

.......... 'SER' or 2-2-2-2

Cheers @Lucien Nunes
I was expecting something like AWG (Hobby books AWG 24 /48)...
as Square inches sounded a bit too big .
Local conditions ,probably include all those lightening storms.
(though France got some memorable hail stones recently)