Correct installation of an outdoor shunt trip switch for emergency responders?

[amluto]

My in-progress electrical service has an outdoor meter box and an indoor main panel and service disconnecting means. The AHJ is okay with the location of the service disconnecting means but requires an outdoor device that responders can use to turn off power without entering the building.

NEC 230.70 seems to allow remotely operated breakers, and it seems like the intent is to have a remote button or switch that trips the main disconnect, so long as the main disconnect can also be manually operated. The details are unclear to me, though. What is the correct way to configure a shunt trip device? I assume we can power it from the load side of the main breaker, but does it require its own overcurrent protection? If so, can that be a small breaker in the main panel (in which case the shunt trip will not operate if that breaker is turned off), or should it be a separate fuse?

 

[Dennis Alwon]

I am closing this thread, in accordance with the Forum Rules.

This site is designed for:

• Contractors
• Electricians
• Engineers
• Inspectors
• Instructors
• Other electrically related individuals

* This NEC Forum is for those in the electrical and related industries. Questions of a "How-To" nature by persons not involved in the electrical industry will be removed without notice.

If you feel this action to be in error, feel free to contact me via PM to explain.

A reminder to all members, if you see a questionable post, feel free to report it by clicking the

button at the bottom left corner of the post.