No secondary over current protection?

[iwire]

You intentionally purchase grounded system transformers and use them as ungrounded?

If I recall correctly 'Charlie the utility guy' has mentioned they stock only Wye type pad mount transformers and use them for either Wye services or delta services by simply leaving XO floating.

 

[mivey]

If I recall correctly 'Charlie the utility guy' has mentioned they stock only Wye type pad mount transformers and use them for either Wye services or delta services by simply leaving XO floating.

Hmmm. What about the blocking of 3rd harmonics provided by the Y-Δ?

 

[iwire]

Hmmm. What about the blocking of 3rd harmonics provided by the Y-Δ?

3 harmonicas do what? :grin:

 

[tryinghard]

If I recall correctly 'Charlie the utility guy' has mentioned they stock only Wye type pad mount transformers and use them for either Wye services or delta services by simply leaving XO floating.

Right on, like I've said all the ungrounded systems that I am visualizing are delta/delta 480 and no mid point tap, not labeled or physical. The 480 wye secondary for ungrounded system in my world is 480 delta ungrouded[able]

 

[tryinghard]

And the 3-phase load decreased. From the link:

True, I recently had this scenario and chose a wye XFMR to avoid increasing the delta.

 

[pfalcon]

And again I emphasize. We have a boatload of stuff in use at our site that is labeled with every connection possible; several of which if used at the same time would require stupidity.

Commonly our sensors have leads for both "Active High" and "Active Low" feedback to processors. It would be a bizarre system to hook up both but the label shows a combined diagram.

The listing is what is on file for the device. We get an abbreviated copy on a piece of paper shipped in the box.

BTW, the X4 tap is to a reference voltage that is not necessarily ground. X1 and X3 provide 120Vac above reference not above ground.