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Old 11-21-2018, 02:09 PM   #14
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Originally Posted by panjumbie View Post
The mechanical (sliding plate) interlock mentioned by several here and pictured in one of the posts would appear to be absent when the cover to the breaker panel is removed.

For that reason and others, it has not been permitted in some jurisdictions and by many utilities.
I just installed one of these for generator isolation for a new subpanel I put in. The mechanical interlock is actually built into the breaker itself not part of the cover. You'd have to literally destroy the breaker to get it off and I would venture a guess this is by design. The interlock I put in is UL listed and was manufactured by Square D.
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