HANDBOOK REQUIREMENTS - Central Maine Power Company

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service (whenever possible) for this application (see Para.
D & E, above). See also Para. 302.
G. 277/480 volts, three-phase, four-wire, wye--
For power and general service installations typically having
demands in excess of 50 KVA. Single-phase load shall
be
balanced between phases in accordance with Para. 305.
H. 240/480 volts, single-phase, three- wire--
For power and general service where the higher voltage is
required to limit voltage drop in secondary feeds and three
phase power is not readily available (available from
Company padmount transformers where load does not
exceed 50 KVA).
I. 480 volts, three-phase, three-wire--
Normally for power installations having demands of not
less than 50 KVA (not available from
Company padmount
transformers).
Note: to limit the available voltage-to-ground, the
Company recommends four wire, wye service (whenever
possible) for this application. See Para. G, above.
J. Service voltages higher than 480 volts--
Available only by negotiation with the Company. The size
and type of customer's
load must warrant such an
installation.