On Sat, 31 May 2008, "BillM" wrote:
"Ignoramus23731" wrote in message

Just one phase.

Just curious---what the heck runs on 440 single
phase?

Not a whole lot - But if you have 277V/480V 3-Phase 4-Wire Wye
service there's a LOT that runs off a single 277V leg to Neutral.
Overhead fluorescent and HID lighting, Emergency and EXIT lights,
parking lot HID pole lights, and a lot more.

You can cover a 5,000 foot warehouse with two or three circuits of
high-bay lighting at 277V or 10 circuits at 120V. Makes it go
together a lot faster and easier, and a lot less wire.

-- Bruce --