Utility service connections
5
240V 3-Phase, delta-connected,
with center tap on one leg
With the delta connection, one leg must
be center tapped, and only the two phases
on either side of the center tap can be
used.
The third line (L3 in the illustration)
of the delta is 208V, with respect to
neutral, and is sometimes referred to as a
“stinger.” Do not use this third line.
The two used phases must each measure
120V to neutral.
Consult the transformer manufacturer’s
literature to verify that the single leg can
supply the required power.
Caution: Do not use a 3-phase
delta-connected transformer
secondary without a center tap on one
leg. No “neutral” point is available for the
required ground connection.
Note:
The Home Connector’s contactor
will only close if it detects the presence of
a ground wire connected to a neutral point
on the transformer secondary.
L3 (NOT USED)
L1
L2
GND
NEUTRAL
(NOT USED)
120V
120V
240V
Home Connector Users Manual.book Page 5 Monday, April 26, 2010 12:38 PM
