Powerlines

From: Eric Smith <eric_at_brouhaha.com>
Date: Mon Apr 26 20:12:15 1999

"Daniel T. Burrows" <danburrows_at_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.
Received on Mon Apr 26 1999 - 20:12:15 BST

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