Zone Selective Interlocking

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Mike 01- We have used it on a couple of power plants' 600V switchgear. The latest has six double-ended lineups (main-tie-main) of Cutler-Hammer gear with 3200 A mains and many 1600A and 800 A feeders. Seems to be working Ok after a couple of installation issues were resolved where the signal wires were not connected across the shipping splits.

In previous employment, I commissioned two or three Square D 480V systems with full primary injection testing of the system with no issues.

I'm sold on it.
 
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