On Thursday, July 24, 2014 11:04:39 AM UTC-4, wrote:
On Wednesday, July 23, 2014 5:56:15 PM UTC-4, amdx wrote:

So to rephrase you said, 277 volts is less dangerous than a lower voltage.

Do you still think this?

No, not if your high voltage lighting branches (brown, orange or yellow phases) are from a service or from a transformer arrangement different from your low voltage receptacles branches (black, blue, and red phases).

Yes, if transformed 277vac and 120vac service is all from one service (of, say two phases of 500 kcmil going into the main interface).

And I don't "think" this. Its in the NEC

Whether bad or good. Sometimes more than one service is coming into a structure. The NEC writes about that:

NEC 230.3 - "An SEC cannot supply a building through another structure"