Disconnects for Transformers

[josh]

Is there a limitation on the length of conductors off the secondary side of a transformer before a disconnect switch is required? The primary and secondary overcurrent projection of the transformer is rated at 125% of the full load amps.

Any code references or even rules of thumb would be helpful.

 

[jim dungar]

Re: Disconnects for Transformers

Conductors must be protected at the source where they receive their supply, unless you meet one of the tap rules.

Assuming this is an indoor application of a 4 wire transformer and that the conductors are rated at the size of your OCPD, then your secondary conductors can be up to 25' before the OCPD.