Corner Ground Delta

[don_resqcapt19]

Don't forget a 3 pole fused switch with an actual "dummy fuse" installed in the grounded phase. Just not a field fabricated one.

I worked on an old Dow plant that was originally supplied by an ungrounded service. All of their MCCs used fuses as the OCPD. When it was converted to a corner grounded system, actual "dummy fuses" were installed in all of the buckets.

 

[jim dungar]

I worked on an old Dow plant that was originally supplied by an ungrounded service. All of their MCCs used fuses as the OCPD. When it was converted to a corner grounded system, actual "dummy fuses" were installed in all of the buckets.

This happened with busway units also.

 

[Tulsa Electrician]

I apologize, there are three ways to go if I understand MIke's YouTube videos on corner grounded delta systems: 1. If you want to switch the neutral you use a three pole breaker 2. Use a two pole breaker and run the grounded conductor straight through 3. Use a two pole fused disconnect run the grounded conductor straight through.

(1) Substitute word "netural" with grounded conductor for the corner grounded system.

I've got several!!! Who wants one?

Which, the dummy or the fuse?

 

[ptonsparky]

(1) Substitute word "netural" with grounded conductor for the corner grounded system.

Which, the dummy or the fuse?

One human, several fuse.

 

[Joethemechanic]

Don't forget a 3 pole fused switch with an actual "dummy fuse" installed in the grounded phase. Just not a field fabricated one.

I wonder why anyone would field fabricate one???????

 

[jim dungar]

I wonder why anyone would field fabricate one???????

Something must have got lost in translation, or they are an item restricted to authorized dealers.

30 years ago, when I was in the distribution business, we stocked the 30A version.

 

[Joethemechanic]

Something must have got lost in translation, or they are an item restricted to authorized dealers.

30 years ago, when I was in the distribution business, we stocked the 30A version.

Yeah much less expensive I believe.

I always felt like they should be fastened in somehow. Lessen the possibility of someone removing it and putting it in the wrong phase