Transformer Neutral Question

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Agorsk

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There is no secondary neutral. But you probably mean 'grounded conductor', in other words the circuit conductor which is bonded to ground at the source.

It appears that either X1 or X2 may serve your grounded conductor, with the other terminal serving your 'hot'.

The description of this transformer raises red flags for me.

They say that it is a 'Three phase to single phase' transformer. It isn't. It is a single phase transformer. The 208V primary voltage it is designed for commonly comes from a three phase system, but the transformer only uses a single phase connection.

The description also says something about taking "two 104 V legs, L+L+N" which never occurs in common power systems, and in particular wouldn't occur if you had a 208V three phase supply.

The transformer diagram show multiple 'H' taps, but nothing in the description says anything about them. Presumably they are there to allow you to adjust for slightly off supply voltages, but not having specs makes them a bit useless.

So someone at Larson doesn't understand their own transformers, but is allowed to write about them. Because of this I don't trust the documentation completely. In particular there might be some undocumented 'grounding strap' that forces either X1 or X2 to be your grounded conductor.

-Jon
 
Agorsk said:
Hello,
Trying to go from 208V (L-L-N) to 230V (L-N) for a piece of European equipment.

Ran across this transformer - (https://www.larsonelectronics.com/product/278642/5-kva-isolation-transformer-208y-120-wye-n-l-l-n-split-phase-primary-230v-l-n-euro-secondary-nema-3r-3ph-to-1ph-fully-potted-encapsulated?productIdBase64=Mjc4NjQy0&rank=2)

https://www.larsonelectronics.com/images/product/WiringDiagram/278642.PDF - Wiring Diagram


Do i just make X1 or X2 my neutral? they are not explicit.
Click to expand...

Does your 230V L-N equipment require a 60Hz supply?


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