Correcting Multiwire Branch Circuit Wiring; Figure 5-5 Using A T240 Autotransformer In Multiwire Branch Circuit Wiring - Xantrex7 UX - REV A Owner's Manual

5.0 Troubleshooting
Multiwire Branch Circuits (continued)

Correcting Multiwire Branch Circuit Wiring

WARNING: UNTIL ONE OF
THE SOLUTIONS ABOVE IS
IMPLEMENTED, A STAND-
ALONE 120 VAC INVERTER
(OR GENERATOR) MUST
NOT BE INSTALLED WHERE
MULTIWIRE BRANCH
CIRCUITS EXIST.
Using A T240 Autotransformer in Multiwire Branch Circuit Wiring
©2002 Xantrex Technology Inc. All Rights Reserved.
P/N 975-0026-01-01 Rev A 06/2002
Correcting multiwire branch circuit wiring is not an easy task. There are several
approaches that can be taken, each with its advantages and disadvantages.
• Rewire existing multiwire branch circuits to conventional "home run" wiring.
This requires a qualified electrician (knowledgeable of multiwire branch circuit
wiring) and is expensive. There may be multiple multiwire branch circuits
located throughout the structure, requiring complete rewiring.
• Add a T240 autotransformer to the output of the inverter to restore the split-
phase configuration. This is the least expensive and easiest method to correct for
multiwire branch circuit wiring. Using this method, half of the current is
supplied to one leg of the circuit and half to the other in a split-phase
arrangement (180° out-of-phase). This will restore the original functionality and
safety to the multiwire branch circuit.
See Figure 5-5 for a diagram using a T240 Autotransformer in multiwire
branch circuit wiring.
Figure 5-5
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