Running 6-3 to stove during rough-in . Can I use a separate ground wire ? The cable I have has red, black, white, no ground. It's about 40' to service panel. Is it possible to ground to a nearby 12-2 circuit, or through wall to additional buried ground rod? I understand that whereas it was acceptable in past to have no ground, current NEC requires ground in new installation.

What is the amperage needed by the stove and does the stove's manufacturer require a four wire connection instead of a three wire?

Running 6-3 to stove during rough-in . Can I use a separate ground wire ? The cable i have has red, black, white, no ground. It's about 40' to service panel. Is it possible to ground to a nearby 12-2 circuit, or through wall to additional buried ground rod? I understand that whereas it was acceptable in past to have no ground, current NEC requires ground in new installation.

The answer is no you cannot!

The answer is no you cannot!No you cannot is correct.

You are right in that for quite a long time now NM cable has required a ground. If you are running it now you must follow the codes in place now. That means your 6/3 w/o ground is useless.
Sorry.

No you cannot is correct.

You are right in that for quite a long time now NM cable has required a ground. If you are running it now you must follow the codes in place now. That means your 6/3 w/o ground is useless.
Sorry. Thanks, for answer. Would it be acceptable to run a conductor for the ground in same raceway back to panel ground bar and if so , what size is adequate?

Raceway?
Are you running the 6/3 cable in a raceway?

NM cable must have the ground inside the sheathing with the conductors.

Raceway?
Are you running the 6/3 cable in a raceway?

NM cable must have the ground inside the sheathing with the conductors. sorry, wrong term. Cable is run through holes in studs . OK, slightly different question; setting aside the NEC letter of the law,and as a purely theoretical exercise, would a separate ground,outside the sheath run parallel to the 6-3 NM to the panel fulfil the intent of the code. In other words given the physics of the set-up would this provide the protection needed at the appliance? It would be a lot cheaper to buy an additional #6 as opposed to buying the entire cable. I'm not trying to create an unsafe situation, but I'm guessing the current wouldn't know the difference

No, that wouldn't work.

No, that wouldn't work. At the risk of sounding like a four year old, why not? Is there some kind of field effect when the ground is within the sheath as opposed to when there is an insulated ground outside the sheath influencing the electrons ? I am not trying to be pedantic, as I am ignorant relating to electrical theories , but I am also very curious and eager to learn. Thanks to everyone who has helped through their responses, Ken