Applying NEC 225.32 Exception 1

[kwn]

Hello All;

I have a question related to NEC 225.31 and .32:

At a Compressor Station, We have an Electrical Building fed from the load side of a Transfer Switch. The Transfer Switch is fed from the secondary of a Transformer. The Transformer and the Transfer Sw are mounted close by (approx 30' apart). The distance between the Electrical Building and the Transformer/Transfer Switch is approx 300'. The Service Disconnect Switch is installed on the Primary of the Transformer.

If we have a Disconnect Switch on the supply side of the Transfer Switch. Would that Disconnect Switch also qualify as a Disconnecting means for the conductors entering the Electrical building (on the Load side of the Transfer Switch) (applying NEC 225.32 Exception 1) ? We do have documented Procedures and LOTO for Isolating equipment in the station.

Your comments would be appreciated. Thank You.

 

[Elect117]

The transfer switch implies there is more than one way to feed the building. Is the transfer switch automatic or manual?

The transfer switch would be your disconnect switch for the building.

Having documented procedures and LOTO is probably good enough to meet the exception. People have different interpretations on what makes someone or a facility qualified.