Posted by Bus Driver on October 23, 2008 at 04:39:39 from (67.213.37.131):
In Reply to: 3 phase wiring posted by skip33652 on October 22, 2008 at 16:51:16:
208/120 is WYE configuration with the neutral, 4 wires plus the ground. As stated already, connecting to any one of the phase conductors plus the neutral gives 120 volts. 208 is good where many of the loads are 120 volts. 240 volts is Delta configuration. Delta may or may not have 120 volts available. If one (of the three) transformers has a center tap, that tap plus a connection to either end of that transformer secondary winding will give 120 volts. That places all the 120 volt loads on just one phase and thus the 120 volt loads should be limited to avoid excessive phase imbalance. Connecting to the other 3-phase plus the neutral of such a Delta system gives 208 volts Single-phase and should never be done. That is called the "high leg" and is marked with orange tape. Often larger Delta services will have smaller WYE connected transformers inside the premises, owned and installed by the customer, to supply their 120 volt loads. Not cheap, but a really good way to do it.
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