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Discuss Screened compartment trunking in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Sparksaflyin
    Offline

    Sparksaflyin Regular EF Member

    Location:
    Leigh on sea
    Anyone come across screened compartment trunking before? If so is anyone aware of any specific reg governing the use of this, in regards to length of run allowed for lv cables in elv side?
     
  2. davesparks
    Offline

    davesparks Trusted Advisor

    Location:
    guildford
    Generally speaking LV cables should not be in ELV compartments of trunking.
     
  3. Flanders
    Offline

    Flanders Regular EF Member

    Location:
    Tamworth
    Look at reg 528.1 it states 'that every cable or conductor is insulated to the highest voltage present' , if run in the same trunking ,As for screening this is normally part of the cable to prevent interference for example SY cable
     
    • Like Like x 1
  4. snowhead
    Online

    snowhead Trusted Advisor

    Location:
    Mildlands
    When you say Screened Compartments do you mean this?

    Multi-Compartment-Trunking.png
     
  5. SWD
    Offline

    SWD Gender neutral Electrician's Arms

    Location:
    London
    Need to post more information up regarding the job to be honest.

    Most screening is just a divider in the trunking.
     
  6. Sparksaflyin
    Offline

    Sparksaflyin Regular EF Member

    Location:
    Leigh on sea
    No I mean plastic dado trunking that has a special type of paint in the elv side to provide a screen for interference. First time I’ve come across it tbh.
     
  7. Sparksaflyin
    Offline

    Sparksaflyin Regular EF Member

    Location:
    Leigh on sea
    I know they shouldn’t be together in the same compartment but sometimes it’s unavoidable and crossing occurs. Also on long runs of cable tray you have the same issue.
     
  8. LankyWill
    Offline

    LankyWill Electrician's Arms

    Location:
    Northants
    Disagree with the cable tray, i have never seen ELV and LV run on the same tray, you can cross through the dado and use a divider to separate the cables. If your using dado why cant you keep them separate?
     
  9. Sparksaflyin
    Offline

    Sparksaflyin Regular EF Member

    Location:
    Leigh on sea
    They can’t be kept seperate due to the way it’s been designed. I’ve very rarely seen seperate tray runs for elv cables. You can get more than adequate separation on cable tray but like I say, occasionally they will cross over
     
  10. spinlondon
    Offline

    spinlondon Trusted Advisor

    Location:
    Harlow Essex
    Yes I’ve used it.
    Not aware of an specific or non-specific Reg governing it’s use.
    If ELV and LV cables are run in the same containment, the insulation of both should be rated at the highest voltage.
    Rule of thumb, is that data and LV cables should not be together for more than 1 metre.
     
    • Like Like x 1
    • Informative Informative x 1
  11. Sparksaflyin
    Offline

    Sparksaflyin Regular EF Member

    Location:
    Leigh on sea
    I had a metre in my head but wasn’t sure if it was a regulation or not. So it’s just a rule of thumb. Thanks for clearing it up.
     
  12. spinlondon
    Offline

    spinlondon Trusted Advisor

    Location:
    Harlow Essex
    The 1 metre rule of thumb applies to data, not ELV.
    There is no maximum distance for ELV and LV being run together.
     
  13. sam400
    Offline

    sam400 Regular EF Member

    Location:
    sussex
    You can get multi compartment trunking that looks like it's been sprayed with copper, I have seen it but never installed it.
     
    • Agree Agree x 1
  14. Sparksaflyin
    Offline

    Sparksaflyin Regular EF Member

    Location:
    Leigh on sea
    Yes this is the trunking I’m talking about.
     
  15. SWD
    Offline

    SWD Gender neutral Electrician's Arms

    Location:
    London
    For crossovers you used to use a bridge.
     

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