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Can a 9070 type T or TF Industrial Control Transformer be used in a back (reverse) feed application as a step-up Transformer?

Issue:
Backfeeding Transformers

Product Line:
LV  Transformers

Environment:
Applies to Low Voltage Transformers by SquareD/Schneider Electric

Cause:
Industrial Control Transformers used as step-up Transformers

Resolution:
No they cannot. Industrial Control Transformers terminals are specifically marked ``primary`` and ``secondary``. As such, the National Electrical Code (NEC) and Underwriters Laboratories (UL) prohibit connecting the source to other than the primary terminals. Also, since Industrial Control Transformers utilize compensated windings to accommodate the high regulation inherent in such small Transformers, the resulting voltage ratio would be lower than desired. In other words, if a Control Transformer were reverse fed, the output voltage would be lower than desired.


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