Xfrmr Tap

[mstrlucky74]

Have to tap a feeder feeding a transformer. The way it was described to me was they were going to add lugs in the xfrmr and run conduit and wire 10' to a disconnect. Does this make sense? Can you add lugs to xfrmr and if so in my mind your not tapping. Or maybe technically your are!?

 

[ActionDave]

Yes, you can add lugs to a transformer. Tap is a term that gets used generically. You may or may not have a true tap.

 

[kwired]

If the added conductor is protected at or below it's ampacity, you don't have a "feeder tap" Same goes for the supply conductor to the transformer.

If both conductors mentioned above are protected at or below their ampacity - you just have a circuit with multiple loads connected to it.

 

[mstrlucky74]

Thanks guy!

 

[iwire]

I believe the secondarys of all transformers that require secondary conductor protection to be taps.

Thinking 240.21(C) here.

 

[jumper]

I believe the secondarys of all transformers that require secondary conductor protection to be taps.

Thinking 240.21(C) here.

I had that thought yesterday also, but OP said:

Have to tap a feeder feeding a transformer.

I think the lugs are getting installed on the primary side.

If so, 240.21(B)(3) does not apply either since the tap is not feeding a tranny.

I am guessing 240.21(B)(1) or(2) may apply.

 

[iwire]

I had that thought yesterday also, but OP said:


I think the lugs are getting installed on the primary side.

Ah, if that is the case I would say it can be done assuming the load calculations allow it.