Page 1 of 4 123 ... LastLast
Results 1 to 10 of 36

Thread: Occupancy Sensors in Electrical Equipment Rooms

  1. #1
    Join Date
    Apr 2016
    Location
    Raleigh, NC USA
    Posts
    394

    Occupancy Sensors in Electrical Equipment Rooms

    My plant has large electrical rooms that contain low voltage switch gears and MCCs. They are unoccupied 99.5% of the time, but the florescent lights are left on 100% of the time. In my opinion this is the perfect application for occupancy sensors. We plan on leaving one light fixture on at each door so no one has to walk into a dark room.

    I didnt see anything in the NEC that prohibits occupancy sensors in electrical rooms. The only safety concern I see is the lights going off while someone is working on a live circuit for troubleshooting. Troubleshooting is the only time we do hot work.

    Are there any OSHA/NEC codes that prohibits occupancy sensors in Electrical Equipment Rooms?

  2. #2
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    5,823
    Quote Originally Posted by Saturn_Europa View Post
    My plant has large electrical rooms that contain low voltage switch gears and MCCs. They are unoccupied 99.5% of the time, but the florescent lights are left on 100% of the time. In my opinion this is the perfect application for occupancy sensors. We plan on leaving one light fixture on at each door so no one has to walk into a dark room.

    I didnt see anything in the NEC that prohibits occupancy sensors in electrical rooms. The only safety concern I see is the lights going off while someone is working on a live circuit for troubleshooting. Troubleshooting is the only time we do hot work.

    Are there any OSHA/NEC codes that prohibits occupancy sensors in Electrical Equipment Rooms?
    I assume you can have multiple sensors in a room so you can provide coverage in blind spots. Otherwise, I'd be a little hesitant, unless you can set them for 8 hours or something close.

  3. #3
    Join Date
    Mar 2017
    Location
    CANADA
    Posts
    37
    Dual technology occupancy sensors are supposed to stay on regardless of motion triggering them to. If I'm not mistaken..

    Sent from my SM-G900W8 using Tapatalk

  4. #4
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    5,823
    Quote Originally Posted by justin13me View Post
    Dual technology occupancy sensors are supposed to stay on regardless of motion triggering them to. If I'm not mistaken..

    Sent from my SM-G900W8 using Tapatalk
    You mean a simple on/off switch along with the motion sensor? If you leave it on, as typically happens for standard switches, then there wasn't much point in installing it, was there?

  5. #5
    Join Date
    Mar 2017
    Location
    CANADA
    Posts
    37
    No, occupancy sensors are PIR and /or ultrasonic and those that are both are called dual technology.

    Sent from my SM-G900W8 using Tapatalk

  6. #6
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    5,823
    Quote Originally Posted by justin13me View Post
    No, occupancy sensors are PIR and /or ultrasonic and those that are both are called dual technology.

    Sent from my SM-G900W8 using Tapatalk
    If you're working in a corner with no line of sight to the sensor, which is usually mounted by the entrance, it's going to get dark sooner or later unless the "on" time can be set for long enough, say 2 hours, to guarantee you'll be going near it, if only for a bathroom break.

  7. #7
    Join Date
    Dec 2012
    Location
    Placerville, CA, USA
    Posts
    19,284
    Quote Originally Posted by gadfly56 View Post
    If you're working in a corner with no line of sight to the sensor, which is usually mounted by the entrance, it's going to get dark sooner or later unless the "on" time can be set for long enough, say 2 hours, to guarantee you'll be going near it, if only for a bathroom break.
    Bathroom stalls pretty much guarantee that you will often be out of the active range of the sensor!
    A single occupancy bathroom is a much easier problem.

  8. #8
    Join Date
    Aug 2006
    Location
    Miami Fla.
    Posts
    7,452
    There is something at the end of 110.26.
    No book handy

  9. #9
    Join Date
    Oct 2007
    Location
    New Jersey
    Posts
    5,823
    Quote Originally Posted by GoldDigger View Post
    Bathroom stalls pretty much guarantee that you will often be out of the active range of the sensor!
    A single occupancy bathroom is a much easier problem.
    I've had that tour, thanks. Let's just say I was particularly glad I have MiniMag on me at all times.

  10. #10
    Join Date
    Aug 2006
    Location
    Miami Fla.
    Posts
    7,452
    Quote Originally Posted by chris kennedy View Post
    There is something at the end of 110.26.
    No book handy
    It's 110.26(D).

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •