4 Feb
1999
4 Feb
'99
1 p.m.
At 10:18 AM 2/4/99 +0100, Philip wrote:
I think 240 (meaning 220 to 240 volts) and 480 3 phase are for larger
services, i.e. motors. The 208
comes when you want 120 volts, and 3 phases of 120 volts connected in "Wye"
has 208 volts between the phases. With 480 volts 3 phase "Wye" between the
phases, one gets 277 volts from each phase to neutral. 277 Volt (single phase
of course) lights are seen in many industrial settings.
-Dave
Yes, very few private residences in North America
have 3 ph power
_unless_
it was asked for and installed, of course at an
extra co$t. If someone
has
a garage or machine shop at home (and the local
zoning laws permit it)
then
3 ph can be installed. Otherwise, bigger
apartment buildings, larger
offices and factory buildings are usually wired for 3 ph at 240 volts or
480 volts.
Gosh. I've seen 3-phase 208 volts in the US, but what would they use 240
for?
Philip.