For some strange reason, I have been tasked to solve a 3-phase problem here at work (in real life, I'm a software guy :-)
We build test equipment that runs on 3-phase wye AC. This equipment is supplied without a linecord; it is up to our customers to wire it in to their plant power correctly. There is a primary AC box that contains a 3-phase breaker that is wired to a barrier strip. The other side of this barrier strip is wired to a power distribution unit (containing a tapped isolation transformer, emergency off contactors, a 3-phase rotation sensor and secondary breakers). For reasons beyond our control, the pigtail on the PDU is wired with L1 being black, L2 being blue, and L3 being black, and this can't be changed. At the barrier strip, this gets changed to black red blue so people wiring up the incoming AC line just have to match up colors (yep, the breaker is also labelled L1 L2 L3). Now I just found out that this system is also shipped for other voltages. Should we use brown orange yellow wiring from the barrier strip to the breaker for 480V? What should we use for the other voltages? We offer this for 208, 240, 277,380, 415, and 480V 3-phase.
This system is used world-wide so whatever we do must be acceptable to both NEC and TUV.
Thanks.
