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Thread: Outdoor trench

  1. #1
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    Outdoor trench

    Can we have outdoor electrical trench with checker plate runs for ~ 1000 ft?, the electrical trench will include 13.8kv cables on 1000mm depth & LV cables on 800mm depth.
    "Have a nice day"

    Sleem

  2. #2
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    From a design perspective, without structured-cable shielding, in close proximity of power-distribution lines during transients like lighting strikes, solar flares, faults, or typical harmonic noise and magnetic fields, the low-voltage equipment could be destroyed.
    Roger Ramjet NoFixNoPay

  3. #3
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    What is the voltage of the low voltage cables? 480v , 240?

  4. #4
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    Quote Originally Posted by Sierrasparky View Post
    What is the voltage of the low voltage cables? 480v , 240?
    Two circuits 400v
    "Have a nice day"

    Sleem

  5. #5
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    Quote Originally Posted by m sleem View Post
    Two circuits 400v
    At 480v I don't think you are worried about sensitive equipment as Ramsey implied. I think he was thinking LV being Comm and data cable and such.

  6. #6
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    Quote Originally Posted by Sierrasparky View Post
    At 480v I don't think you are worried about sensitive equipment as Ramsey implied. I think he was thinking LV being Comm and data cable and such.
    there are two comm and data trunks on top of the trench
    "Have a nice day"

    Sleem

  7. #7
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    Quote Originally Posted by m sleem View Post
    there are two comm and data trunks on top of the trench
    Are the comm and data trunks running in metallic raceway? If they are, they might be pretty well shielded to begin with.

  8. #8
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    Quote Originally Posted by m sleem View Post
    Can we have outdoor electrical trench with checker plate runs for ~ 1000 ft?, the electrical trench will include 13.8kv cables on 1000mm depth & LV cables on 800mm depth.
    Quote Originally Posted by m sleem View Post
    Two circuits 400v
    Quote Originally Posted by m sleem View Post
    there are two comm and data trunks on top of the trench

    Where did the comm cables come from ,,, that is a big oops.

  9. #9
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    Quote Originally Posted by Sierrasparky View Post
    Where did the comm cables come from ,,, that is a big oops.
    Another forum member NewtonLaw is more familiar with an Electromagnetic-Transient Program called Cyme
    Roger Ramjet NoFixNoPay

  10. #10
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    Quote Originally Posted by Sierrasparky View Post
    Where did the comm cables come from ,,, that is a big oops.
    But, i'm still meeting the requirements of 800.133(a)(2) since we have approx 500mm distance from telecom to 13.8kv feeders, may be i'm not meeting TIA/EIA where >600mm shall be maintained but it's ok from NEC requirements.
    "Have a nice day"

    Sleem

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