[Shop-talk] Wiring a new compressor.

[Steven Trovato]

The neutral goes nowhere.  A 220V load just needs the two wires.  If 
an appliance also wants to run something on 110V, then it requires a 
neutral.  This is common when 220V is used for something like a 
heating element and control electronics, light, clock, etc run on 
110V.  Just stick a wire nut on the extra wire and leave it 
unconnected.  You still need the bare wire connected to the green 
screw, but that only comes into play as a safety device when 
something goes wrong.  The motor itself is running on the two wires 
attached to L1 and L2.

At 09:55 PM 12/9/2009, John Mitchell wrote:
>    I just received a new Ingersoll Rand compressor which in 220V 
> single phase.  The problem is the box has only 2 wiring 
> connections, L1 and L2.  There's also a greenish screw at the back 
> of the box, which I assume is for the bare ground wire.  So where 
> does the neutral wire go?