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Mark, You BETTER find out what service is feeding that fuse box !!!!! !!!!! Sure its 3 phase???? How many wires enter it??? Any Green or bare wires and where atatched??? Any White wires and where atached??? A) If the service were straight 240 volt only 3 phase floating 3 wire Delta, there would be 240 volts between any two terminals, so since you mention 120 volts, IT DONT SOUND LIKE THATS WHAT YOU HAVE..... ..... B) If the service was a 208 Y 120 volt three phase 4 wire grounded Y, there would be 208 volts between any phase wire to another, but 120 between any phase wire to the Neutral..... ... C If the 3 phase service is from a 120/240 volt three phase 4 wire center tapped system (high or red leg system) there would be 240 volts from any leg to another,,,,, ,,120 volts from 2 of the legs (on the center tapped winding) to Neutral,,,,, ,,208 volts from the red/high leg to Neutral buttttt ttt thats NOT one of the voltages n sources for use..... its the High or Red leg D) If the service was in reality ONLY Single Phase and a 120/240 volt single phase 3 wire system (like normal household) there would be 240 volts Line to Line but only 120 from either Line to Neutral..... ... ONCE YOU FIGURE OUT WHATS REALLY INSIDE THAT FUZE BOX If it were a straight 240 volt 3 phase 3 wire floating delta, the 3 240 volt phase wires would wire to the 3 input welder wires. If it were a 208 Y 120 volt 3 phase 4 wire grounded Y system, the 3 phase wires connect to the welder and an equipment grounding conductor (EGC) gets connected to the welders outer metallic case/frame. If it were a 120/240 volt 3 phase 4 wire grounded center tapped Delta red/high leg system, the 3 phase wires connect to the 3 phase welder inputs while the EGC again connects to the welders frame/case. NOTE if you end up with a plug n receptace it, of course, has to be the proper voltage n current rating plus sufficient poles for all the phase conductors plus the EGC FIND OUT WHAT SERVICE YOU HAVE !!!!! !!!! John T
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