Generator Lead Connections
Lead Numbering
Each coil lead is marked according to the following
diagram.
Numbering is clockwise from the top and from the
outside in. Terminal TO is the neutral lead on all high
voltage connections. On low voltage connections TO is
connected with T4, T5, and T6 to form the neutral
terminal. The standard generator diagram and the
terminal connections are on the nameplate of each
generator.
Neutral Connections
Single Units
Three Wire: In a three phase, three wire system, the
generator should normally be grounded according to
local wiring codes. In some cases, however, it is
undesirable to ground the neutral wire. For example, on
boats a grounded neutral may increase the problem of
electrolysis. In applications where definite measures are
taken to prevent grounds to the load leads, an
ungrounded neutral can be used. Be sure to check your
local wiring codes.
Four Wire: In a three phase, four wire system, the
neutral wire should be grounded according to local
wiring codes. For only single unit operation, there
should never be a need for a disconnect switch, or
device, in the neutral line.
Multiple Units
Operation of multiple generators in parallel, having all
neutrals grounded, may result in current circulating
through the neutral connections. To eliminate the
possibility of circulating currents, ground the neutral of
only one generator. If multiple generators are alternated
on line, a single pole single throw knife switch should be
installed
in
the
neutral
ground
circuit
of
each generator, so all but one neutral ground circuit can
be opened. Be sure one neutral ground circuit is closed.
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