Transformer Secondary OCPD

[escyr]

On a 480V Primary 240V (L-L) Secondary, single-phase transformer, am I required to install an OCPD in each leg of my 240V (L-L) transformer secondary? Can you point me to the NEC section that states this?

 

[dkidd]

You can protect it on the primary only if you want, unless you have 120 volt loads.

 

[petersonra]

You can protect it on the primary only if you want, unless you have 120 volt loads.

That is not what the code says.

240.4 (F) Transformer Secondary Conductors. Single-phase (other
than 2-wire) and multiphase (other than delta-delta, 3-wire)
transformer secondary conductors shall not be considered to
be protected by the primary overcurrent protective device.

It does not matter what the voltage is. It matters that it is a 2 wire circuit or not.

 

[petersonra]

You can protect it on the primary only if you want, unless you have 120 volt loads.

That is not what the code says.

240.4 (F) Transformer Secondary Conductors. Single-phase (other
than 2-wire) and multiphase (other than delta-delta, 3-wire)
transformer secondary conductors shall not be considered to
be protected by the primary overcurrent protective device.

It does not matter what the voltage is. It matters that it is a 2 wire circuit or not. In this case he says he has a 240 V single phase secondary so presumably it is two wire.

If the secondary of a transformer with a 240V secondary had 120V loads, it could not be a 2 wire circuit.