In the graphics you have shown, where motor fault current contribution effects adjacent circuit breakers' fault current, I don't see how 240.86C is written properly to address this concern. Instead it seems to be written to address only a series rated pair at a given motor, or a motors connected in the middle of a series rated pair.
Since the new rule 240.87 may apply when someone is replacing a breaker in a switchboard, what happens when someone is installing a downstream breaker over 1200 A and that breaker was originally configured to be series rated and now you have to have a fast overcurrent setting for arc energy reduction? It would present a greater hazard to install such a thing and forcing one to replace the entire switchboard instead of just 1 breaker is a lot.
Another reason to need a PE to be involved in series rating per 240.86A: Modifications to facilities where there will be different circuit breaker manufacturers.
Education Power Volume was off in the very first few seconds of the video. I should just edit the beginning out but left it as is. Thanks for the feedback.
In the graphics you have shown, where motor fault current contribution effects adjacent circuit breakers' fault current, I don't see how 240.86C is written properly to address this concern. Instead it seems to be written to address only a series rated pair at a given motor, or a motors connected in the middle of a series rated pair.
How does an arc energy reduction maintenance switch effect downstream series rated breakers?
Since the new rule 240.87 may apply when someone is replacing a breaker in a switchboard, what happens when someone is installing a downstream breaker over 1200 A and that breaker was originally configured to be series rated and now you have to have a fast overcurrent setting for arc energy reduction? It would present a greater hazard to install such a thing and forcing one to replace the entire switchboard instead of just 1 breaker is a lot.
Another reason to need a PE to be involved in series rating per 240.86A: Modifications to facilities where there will be different circuit breaker manufacturers.
Cannot hear what you say volume way to low
Education Power Volume was off in the very first few seconds of the video. I should just edit the beginning out but left it as is. Thanks for the feedback.