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Was this code 50 years ago?

[ATTACH]157755[/ATTACH]

All wired with 2-conductor 12ga, but because I've seen it in quite a few buildings around here I was wondering if it was code at one time for 2-prong to 3-prong conversions or something.

Although it could have just been the same "electrician" I guess too.

Wouldn't be an issue on a bar-band stage either as the muso's always break their ground pins off anyways :-)