5
Making the AC Input/Output Connections
Before making any connections to the Isolation Transformer ensure that the AC Power is off at the main
breaker box. Check that the source voltage and frequency matches the voltage and frequency listed on the
unit’s nameplate. For units with transformer taps, verify that the tap has been set to the correct AC input. (See
Changing Transformer Taps procedure for details). Select wire size, using the table below, based on the input
protection. These are recommended sizes. All National and Local Wiring Codes must be followed.
NOTE: For transformers with 120/240/208 VAC input:
•
120 VAC input arrangement has input fuses or breaker poles wired in
parallel
o
Example: ACF1 = 70 amp, ACF2 = 70 amp. Input protection = 140 amps.
•
240/208 VAC input arrangement has input fuses or breaker poles wired in
series
o
Example: ACF1 = 70 amp, ACF2 = 70 amp. Input protection = 70 amps.
