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Identify these plugs please

rustytool

Stainless
Joined
Oct 27, 2010
Location
Moscow,Idaho,USA
DSCN0589.jpgThese are auxiliary plugs wired into the electrical box of a Studer grinder.
The machine is wired for 220v 3 phase. The black plug is 220v 3phase.
The white one is stepped down by a transformer to 50 volt.
Wondering if I can get the male plugs to fit these sockets or just convert to nema.
Did a bunch of googling but didn't find anything. My guess is obsolete French plug.
Greg.DSCN0590.jpg
 
First one I believe you are correct about.

Zero idea on the other.

You are in the US, so change them to US, and stick the old ones in a box so someone who cares can use 'em again and say it is "all original".

EDIT: I am not 100% sure about the ID, as I the ones in the link which appear to be similar are actually 2 pin types with a screw positioned as if it were a receptacle hole. However, other outlets using the flatted sides appear to be listed as obsolete, and the protruding ground pin is a French innovation, so it remains reasonably probable that it is an old French 3 phase outlet.

french 3 phase power plug - Google Search
 
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