240V panel on 12/2 240V outlet

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If the wire originates in the panel where the neutral bar is grounded to the case (99% of the time this is the main panel unless you're in a mobile home) it doesn't really matter whether it's connected to the ground bar or the neutral bar -- they are still the same thing at that point. It's more "workmanlike" to put it on the ground bar, but that's all.

If it's a small panel and was installed a long time ago, there might only be one terminal bar. Don't go messin' with it unless you know what you're doing.
 
... it doesn't really matter whether it's connected to the ground bar or the neutral bar -- they are still the same thing at that point.
They aren't the same. They are just electrically connected at the service entrance. Indeed it does not make, therefore, electrically, at the service entrance, any difference whether one connects to one bar or the other but it does not make any difference, electrically, whether the neutral is white, nor whether empty slots in the panel box are covered but the code requires these things as it does that the ground be connected to the ground bus.

It's more "workmanlike" to put it on the ground bar, but that's all.

That's actually sufficient for a violation as 110.12 requires installations to be workmanlike.

408.20 says that grounding conductors may not be connected to a terminal bar provided for grounded conductors (neutral) unless that bar is identified as being for that purpose, and, of course, the panel is one where the grounded/grounding bond is required or allowed.
 
That's actually sufficient for a violation as 110.12 requires installations to be workmanlike.

408.20 says that grounding conductors may not be connected to a terminal bar provided for grounded conductors (neutral) unless that bar is identified as being for that purpose, and, of course, the panel is one where the grounded/grounding bond is required or allowed.

That's why I used that word. ;) It is reason enough to fail an inspection, but this isn't an inspection. It's not a good enough reason (in my opinion) to have a homeowner who doesn't know what he's doing mess with it.
 
Don't worry I know better than to go dickering around in the breaker box.
 
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