Transformer conduits

[jmdearie]

I cannot find in the code anything about transformer conduit connections. Is connection with EMT permissible? Please include location in code in responses.

 

[augie47]

In this regard, the Code would indicate if there was a type conduit that could not be used. To my knowledge there is no restrictive language.
You should check your manufacturer instructions to see if they have restrictions. Some transformers have restrictions on height of conduit entry.

 

[infinity]

I always found it odd that we use a short piece of FMC with a transformer solidly mounted to concrete. :roll:

 

[templdl]

You may not want to connect to a transformer directly using EMT as it is not unusual for it to transmit the transformer noise to the service to which the EMT is fastened to. You may want to consider the flex type which reduces noise transmit ion.

 

[masterinbama]

I always found it odd that we use a short piece of FMC with a transformer solidly mounted to concrete. :roll:

Me too. Just about the only time I use flex is when it is hung from all thread.

 

[Strathead]

Me too. Just about the only time I use flex is when it is hung from all thread.

Not me, as Templd said, transformers hum. Often more so when they get loaded and age. Flex helps prevent this from transmitting to other parts of the structure. That is also why many places and specs require isolation pads on the mounting feet.

 

[Will B]

Many newer transformers have isolation pads between the windings and the case, so the noise would not be transmitted through the conduit.

 

[iwire]

Not me, as Templd said, transformers hum. Often more so when they get loaded and age. Flex helps prevent this from transmitting to other parts of the structure. That is also why many places and specs require isolation pads on the mounting feet.

Yes, installing a transformer in an office building, school or hospital etc. noise can be an issue, and yes if the specs call for extra idolaters in the mountings they will also call for flex.

On the other hand when you are installing it directly on the concrete in a machine room, factory etc. it is just a waste of time and material to use flex.