Secondaries are the conductors originating at the
low-voltage secondary winding of a distribution transformer. Secondaries for
residential service are three-wire single-phase circuits. They extend along
the rear lot lines, alleys, or streets past customer's premises. The
secondaries can be overhead lines or underground lines.
Overhead secondary lines are usually strung below the primary lines and
typically in a vertical plane. When secondaries are strung in a vertical plane, they are
directly attached to the
support pole one above the other. This is in contrast to the primary lines
which are often strung on a cross bar or other attachment in a horizontal or
"V" shaped plane.
Figure 1. Cabled secondaries
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Figure 2. Secondaries in a vertical plane
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Figure 3. Cabled secondaries, primaries in a "V" plane
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