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Water in Conduit

Discussion in 'Electrical Codes' started by jar546, Oct 16, 2018.

  1. jar546

    jar546 *****istrator

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    When you start watching this video you might say "what's the big deal?", until you keep watching the video.
    Very interesting find. Think about any code requirements that may have prevented this. Are there any?

     
  2. ICE

    ICE Sawhorse

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    Underground conduit should be sealed at each end above ground.
     
  3. JCraver

    JCraver Sawhorse

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    Our POCO doesn't seal, and won't let the property owner seal, the end of conduits that run up the transformer poles. No turn at the top, no cap/escutcheon, won't even let you squirt it full of silicone. When I asked a lineman why he said, "That's how we do it". o_O
     
  4. Builder Bob

    Builder Bob Sawhorse

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    I would have concerns except until you see electrical connections allowed at marinas and docks - there, conductors are allowed to be in water unprotected.........might have better insulation but still is unprotected, at least the conduit protects the conductors.....Besides, many POCO require weep holes drilled into elbow to allow for water to weep out or on dependent upon water table heights.
    I heard that this is especially popular up north where freeze/thaw cycles can rupture or break conduit when water freezes.
     
  5. Pcinspector1

    Pcinspector1 Platinum Member

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    Same here, open conduit at the top
     
  6. Pcinspector1

    Pcinspector1 Platinum Member

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    Weep out or weep in?
     
  7. ICE

    ICE Sawhorse

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    300.50 (F)
    The end of an underground conduit that enters a building shall be sealed. I encountered a flooded building (2" of water) because a utility vault that was much higher than the building floor was taking on water. It ran through the conduit.
     
    jar546 likes this.
  8. Francis Vineyard

    Francis Vineyard Sawhorse

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    Any inspection requirement to prevent this? Suspect insulation damage (maybe a rodent or sharp corner) let the smoke out of the cable into the basement of a restaurant. First responders where looking for a kitchen fire until they found smoke still emitting from the main service panel. Melted the cable into the conduit, had to dig it all up.
    PHASE TO PHASE SHORT 002.jpg
    PHASE TO PHASE SHORT 007.jpg
     
  9. Pcinspector1

    Pcinspector1 Platinum Member

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    If a slip conduit is used below the meter can it would allow water from a POCO thats above the service to escape wouldn't it? Just saying
     
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  10. Builder Bob

    Builder Bob Sawhorse

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    The only place where I heard a seal is required is to prevent water from electrical conduit to enter a flood protected house...... however I am not a flood plain guru and am sure that government interest in our safety has provided guidance to ensure flood waters don't enter our house the same as plumbing back flow preventers are required for house lower than the height of a fail pump station...... hmmm. Not sure it exist, but somehow is our fault.
     

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