Transformers

What is the proper wiring of my transformer?
Transformer wiring information is usually stamped on the transformer housing, or on an attached label.

If it is not, the common wiring is as follows. For input common is white (WHT), 120V black (BLK), 208V red (RED), 240V orange (ORG), 480V blue (BLU). As an example if connecting 240V, use white and orange.

For the output side it is also determined based on output voltage desired. The normal wiring is common on blue (BLU), 2.5V white (WHT), 12V black (BLK), 24V yellow (YEL) An example for 24V use blue and yellow.
How do I connect my transformer?
Connect your primary (input) voltage to the correct colored wires. Inputs are always white, with a second wire depending on voltage.

For input common is white (WHT), 120V black (BLK), 208V red (RED), 240V orange (ORG), 480V blue (BLU). As an example if connecting 240V, use white and orange.

For the output side it is also determined based on output voltage desired. The normal wiring is common on blue (BLU), 2.5V white (WHT), 12V black (BLK), 24V yellow (YEL) An example for 24V use blue and yellow.
Is the output of my transformer polarized?
There is no true ground or neutral on the output.

Determine the correct wires based on output voltage desired. The normal wiring is blue (BLU) with either white for 2.5V(WHT), black for 12V(BLK), or yellow for 24V (YEL) An example for 24V use blue and yellow.

Neither wire will be true common, or measure 24V with respect to true circuit ground.