PICdude wrote:
> I recently picked up a used reflow oven (APS GF-12) and it does not  
> have a plug -- just 3 bare wires (12ga white, green and black).  The  
> prev owner said it was hardwired and thinks it was 3-phase, but IIRC  
> 3-phase requires 4 wires... or not???

I doubt it's three-phase.

I'd probably go with single-phase AC. Green being the ground, white 
being phase, and black being neutral. You should be able to (at least) 
figure out which one is ground by doing a continuity check between the 
case (assuming it's metal) and the ground wire.

> I have 2 options for outlets here at the office...
> (1) a Nema L6-30 ( http://www.ezdiyelectricity.com/?p=238 )
> (2) Another similar outlet, but the prongs are in a smaller circle.   
> It says "Hubbell twist-lock 20A 250V plug".
 > - Are both of these outlets single phase?

Looks like two-phase to me (is that even possible?). 250V between the 
two phases, plus one ground.

> - Is this oven a single-phase oven? (APS only made these as 220V  
> single-phase or 220V 3-phase).

Looks like it to me.

> - Is there a standard for the colors on the plug wires?

Pass. I'd put money on green being the ground wire, though.

> - Is there any way to check the oven  for the correct phase  
> requirements (resistance tests, etc) before I damage the oven?

See above -- if there's metalwork (or the case is metal) then you should 
be able to do a continuity check between the metalwork and the wires to 
figure out which one is ground.

>  and APS won't speak to
> me unless I give them $2000 first.

Ah, the good old "support contract"...

-- 
Phil.
piclist@philpem.me.uk
http://www.philpem.me.uk/
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