Zuper Dave
Member
- Location
- Cincinnati, OH
Design calls for 3-phase twist-lock to feed single-phase load. Is that "legal"?
I have four portable AC units. They run on 50A of 208 or 240VAC single-phase. I have portable generators on site with 3-phase twist-lock (4 wire) receptacles on them. HOWEVER, the receptacles are fed by (factory-original) TWO-pole circuit breakers (single-phase). We have hooked up these AC units directly to these generators and they work fine. But is that to code? It would certainly be a problem for anyone who attempts to hook up a 3-phase load to these receptacles!!!
But the story continues. We are now supplying hardwired circuits to receptacles in several locations where we anticipate the possible need to run the portable AC units. The circuits are single-phase: 2-wires and a ground. They were intended to be a continuation of what we have on the portable generators. (3-phase receptacles fed single-phase via two-pole circuit breakers) However, my project GC says this will fail an electrical inspection and has installed SINGLE-PHASE twist-lock receptacles that are incompatable with both the portable AC units and the 50-foot extension cords we have.
We consider these to be dedicated outlets. We have nothing else that will fit these outlets. There is almost NO CHANCE that anyone can gain access to these secured areas where these are located in order to use these receptacles. We can also label the heck out of them. Or lock them out....
What does the code say? Is this an AHJ thing? :?:?:?
I have four portable AC units. They run on 50A of 208 or 240VAC single-phase. I have portable generators on site with 3-phase twist-lock (4 wire) receptacles on them. HOWEVER, the receptacles are fed by (factory-original) TWO-pole circuit breakers (single-phase). We have hooked up these AC units directly to these generators and they work fine. But is that to code? It would certainly be a problem for anyone who attempts to hook up a 3-phase load to these receptacles!!!
But the story continues. We are now supplying hardwired circuits to receptacles in several locations where we anticipate the possible need to run the portable AC units. The circuits are single-phase: 2-wires and a ground. They were intended to be a continuation of what we have on the portable generators. (3-phase receptacles fed single-phase via two-pole circuit breakers) However, my project GC says this will fail an electrical inspection and has installed SINGLE-PHASE twist-lock receptacles that are incompatable with both the portable AC units and the 50-foot extension cords we have.
We consider these to be dedicated outlets. We have nothing else that will fit these outlets. There is almost NO CHANCE that anyone can gain access to these secured areas where these are located in order to use these receptacles. We can also label the heck out of them. Or lock them out....
What does the code say? Is this an AHJ thing? :?:?:?
