3-phase

From: Dave Dameron <ddameron_at_earthlink.net>
Date: Thu Feb 4 13:00:49 1999

At 10:18 AM 2/4/99 +0100, Philip wrote:
>
>> 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.
>
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
Received on Thu Feb 04 1999 - 13:00:49 GMT

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:31:59 BST