26 Apr
1999
26 Apr
'99
8:12 p.m.
"Daniel T. Burrows" <danburrows(a)mindspring.com> wrote:
Close but not quite right. For single phase
installations the power company
supplies 2 hots and neutral. This is a center tapped secondary and the
neutral is earthed at the service entrance.
No, for split-phase, the power company does not "supply" a neutral from the
distribution system. The neutral is *only* tied to the center tap of the
secondary and to ground. It is not tied to anything on the primary side of
the transformer; that would be bad.
The primary of this transformer
is fed from only 1 high voltage phase.
I don't believe this; it doesn't match the descriptions I've read elsewhere.
I've always seen it shown in diagrams with the primary connected across two
phases of the three-phase. Otherwise you need a high-current return path
somewhere else.
To even the loading of the phases, the transformers for split-phase service
have their primaries distributed between the three possible combinations of
the three phases.