2 transformers/voltages, both neutrals tied to ground

[robbm]

We have a control panel in which we'll have 2 transformers (460x115 and 460x230). The neutral of our transformers is usually wired to a 'neutral' terminal and also grounded to the backpanel. Is there any issue with both transformer neutrals being grounded to the backpanel, thus both voltages sharing the same neutral?

 

[dpc]

Each transformer needs its own neutral conductor, but both neutrals can be bonded to the same ground point, and probably should be. You don't want to use a ground wire as a current-carrying conductor.

If this is all inside of a control panel, you'd better check applicable UL requirements if UL labeling is required.

 

[robbm]

ok, thank you. we plan on separating/labeling the neutrals to two different connection points, but electrically, they'll both be connected to ground. Not sure of the UL issue either, but this particular panel cannot be UL-labeled anyways, so that won't be an issue.

 

[dpc]

particular panel cannot be UL-labeled

Just as an aside - any panel can be UL-labeled if you have enough money and time.

Cheers,

Dave

 

[robbm]

True. This project we are using ultrasonic generators that are only made in 230vac models and aren't UL-listed because of the leakage current, and due to that any GFCI used to allow it to be UL labeled trips when we try using it. Any suggestions that would allow us to label it would be welcome though...