Power connections for stove

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No, it would definately be illegal.

In the case where only a 3-wire existed, it would be a hot, hot, ground. And most likely, type SEU cable. So the "pigtailing" would be from ground to neutral, not neutral to ground. The ground would be smaller than the conductors. And with all the 8/3 with ground I've seen, the ground is #10 anyway.

The correct phrase would be "existing installations."

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Here (Canada) whenever you replaced a stove or dryer you _had_ to install a 4-wire outlet, full stop. This dates back at least 30 years.

As I understand it, while Canada insists on going to 4 wire on ALL installations (or renovations), US code has grandfathered 3 wire to the point where just putting an outlet on a 3-wire circuit won't require an upgrade to 4-wire. Ask an inspector to be sure. This will probably vary widely from place to place.
[This is despite the fact that in the US, they permit you to treat conduit as a ground, hence a conduited 3-wire circuit is trivially upgradeable to 4 wire, but in Canada, you cannot (legally) use conduit as a grounding conductor.]
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Chris Lewis, Una confibula non set est
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