When using a 120/240V-16/32V Group II transformer with a 208V input, how much voltage is applied to a control panel requiring 240V?

In this scenario, understanding the operation of transformers is crucial. A 120/240V-16/32V Group II transformer is designed to have specific input-to-output voltage ratios based on the winding configuration and the applied input voltage.

When a 208V input is applied to the primary side of the transformer, a calculation needs to be performed to determine what voltage will be delivered to the secondary side, which is intended for a control panel requiring 240V.

Transformers adjust voltage levels based on their turns ratio. In this case, if the transformer is ideally set up for a nominal 240V output with standard input voltage, we can utilize a straightforward voltage ratio adjustment. The formula for transformer voltage is based on the principle that the voltage is proportional to the number of turns in each winding.

When we apply the input voltage of 208V to the transformer, the output voltage can be estimated using the following calculation:

Output Voltage = Input Voltage × (Output Turns / Input Turns)

Assuming the turns ratio is designed for a maximum of 240V on the secondary when 240V is the standard input, you need to adjust for the actual input of 208V. The output voltage will be slightly less due to the lower