User Tag List

Page 1 of 2 1 2 LastLast
Results 1 to 10 of 17

Thread: Low Voltage in Electrical Service Panel

  1. #1
    Join Date
    Oct 2016
    Location
    Las Vegas, Nevada, USA
    Posts
    14
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Low Voltage in Electrical Service Panel

    In one of our buildings I was shown an electrical service panel that has inside the door a separated side channel. In that channel a Low Voltage (Category 5) patch panel has been installed. I have never seen such a thing and wonder what the EMI in there must be like for the network devices connected. Beyond the interference, is it within code to have Low Voltage collocated in an electrical panel? They tell me this was installed in the 90's. I've been searching the NEC and can't find my answer there (yet). Thank you very much for your help.

  2. #2
    Join Date
    May 2005
    Location
    Richmond, Virginia
    Posts
    25,723
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Can you shoot and post a couple of pics?
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  3. #3
    Join Date
    Oct 2016
    Location
    Las Vegas, Nevada, USA
    Posts
    14
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I have attached a picture of the electrical cabinet. There is a Cat 5 patch panel on the right. Thank you for your help with this.
    Attached Images Attached Images  

  4. #4
    Join Date
    May 2005
    Location
    Richmond, Virginia
    Posts
    25,723
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Okay, pic helps.

    There is no interference concern because (a) there is metal between the two compartments (also addresses voltage concerns) and (b) 60Hz provides little problem for ethernet signals.

    Those UTP cables might be for control wiring.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  5. #5
    Join Date
    Oct 2016
    Location
    Las Vegas, Nevada, USA
    Posts
    14
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thank you Larry. My first concern was whether Low Voltage could even be in that cabinet. I guess with the metal separator it is OK. I also see in the photo that the Cat 5 and electrical cables are coming in through the same bushing. I don't think they are sharing a conduit. But I didn't look that closely when I was there.

  6. #6
    Join Date
    Jun 2003
    Location
    Hawthorne, New York NEC: 2014
    Posts
    4,822
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    EMI, even without the divider (which you can't do) isn't an issue but that panel itself is very interesting. I would like to see a picture of the label on the inside of the door to see who the manufacturer is and if it says anything about that LV section and is it really supposed to be there. What does it provide power to? HVAC maybe and the LV is for building automation? Maybe made by some HVAC manufacturer?

    -Hal

  7. #7
    Join Date
    Dec 2007
    Location
    NE Nebraska
    Posts
    41,578
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My guess it was made for a specific application and isn't a general use kind of thing.
    I live for today, I'm just a day behind.

  8. #8
    Join Date
    May 2005
    Location
    Richmond, Virginia
    Posts
    25,723
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I'd call that a cabinet within a cabinet.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  9. #9
    Join Date
    Oct 2016
    Location
    Las Vegas, Nevada, USA
    Posts
    14
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thank you for the help guys. i really appreciate the insight. I have attached a photo of the manufacturers label. I hope this tells whether the collocated patch panel can be there. And yes, the patch panel supplies cameras, and temporarily installed Wireless Access Point locations.
    Attached Images Attached Images  

  10. #10
    Join Date
    Jun 2003
    Location
    Hawthorne, New York NEC: 2014
    Posts
    4,822
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    No idea what it's for, give us a clue. Twist locks in and out, looks like some kind of PDU. Pacific Power Prod apparently has changed a lot and don't show anything like that. They do make PDU pedestals for mobil home parks. With 3 phase, all I can think of here is a hookup for refrigerated "reefers" at a ware house.

    -Hal

Posting Permissions

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