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Topic: To disconnect or not?

User: Falcon86, Location: Michigan. It's a beautiful peninsula, I've looked

Asked on: Wednesday, March 16, 2011 at 1:18 pm EDT
Answered on: Tuesday, May 14, 2024 at 2:53 am EDT

Question: We have some three phase 120/208v plugs on the outside of our building and the disconnect for them are in side the building. We plug in mobile equipment to them.Should we have disconnects outside and what code does this apply to?

Yes, there should be disconnects outside.Code Requirements



NFPA 70 National Electrical Code (NEC)
Article 404.9(A) states that "Where an individual portable generator is used to provide power to a structure or building, the portable generator and its associated disconnecting means shall be located outside the building." NEC Article 440.12 states that "Disconnecting means shall be provided at the point of entrance of the conductors to the building or structure."Reasons for Having Outside Disconnects



Safety

In an emergency, such as an electrical fire or a natural disaster, it is crucial to be able to quickly disconnect power from outside the building.


Convenience

Having disconnects outside allows for easy access to shut off power for maintenance or repairs without having to enter the building.

Code Compliance

Meeting code requirements helps ensure the safety and proper operation of the electrical system.

Notes:
The disconnects should be rated for the amperage and voltage of the plugs they serve. The disconnects should be clearly labeled and easily accessible. Consider using a weatherproof disconnect enclosure to protect the disconnects from the elements. Flag for review

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