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.