high leg *stinger* to ground. Usable?
high leg *stinger* to ground. Usable?
(OP)
I am trying to install a piece of kitchen equipment in a restaurant. There is 3 phase power with a stinger leg (red and black to ground is 120, purple to ground is 208, any hot leg to any other hot leg is 240). The red and black legs are pretty much maxed out in terms of amperage, but the stinger leg is barely used. If I have a straight 208 single phase requirement for a piece of equipment, can I use to stinger leg and a neutral to power it? This is defienitely not a 208/120 piece of equipment.






RE: high leg *stinger* to ground. Usable?
RE: high leg *stinger* to ground. Usable?
The three transformers are connected in a delta configuration with one of them, usually the larger sized transformer center tapped to provide 120 Volt power. All three phase loads and single 240V loads are fed by connecting between A-B, B-C or C-A nodes. All 120 volt loads are fed from the B to "high leg" or center tapped neutral or the neutral to C connection. It was common practice in the past to install these systems where both 120 and 240V loads existed. Utility companies started phasing these out as wye connected systems became more popular and available. They have the disadvantage, (as do 120/240 single phase services), of being difficult to balance on the distribution system.
RE: high leg *stinger* to ground. Usable?
davidbeach: If transformer capacity is used up, it wont take any kind of load, whether be it 208V or 240V, without being overloaded.
eejamie: It may be old, but still a valid congfiguration and meets Code.
RE: high leg *stinger* to ground. Usable?
EEJamie: Any load that can run on 208V single phase would not see any difference between being connected phase-to-neutral on a 240V delta and being connected phase-to-phase on a 208Y system.