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Taking 3 cables through corrugated tin

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  • 02-01-2021 12:56pm
    #1
    funkey_monkey
    Registered Users Posts: 8,115 ✭✭✭


    Hi.

    I'm putting up two mini led floodlights with extremal pir to illuminate a passageway.
    The light units are to be mounted on the side of a corrugated tin shed.
    The power is on the inside of the shed.

    I've just realised that I will need to put 4 cables through the tin to get this working. 2 power cables, for the light, twin+e into pir and switched live back into the lights. I have some 3+e which I could use and that would reduce to 3 cables.

    However, question remains - is there an easier way to get the cables through the tin without risk of cable wearing against tin Edge without need for 3 cable glands?


    Thanks.


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    #2
    Treseemme.
    Banned (with Prison Access) Posts: 124 ✭✭Treseemme.


    funkey_monkey wrote: »
    Hi.

    I'm putting up two mini led floodlights with extremal pir to illuminate a passageway.
    The light units are to be mounted on the side of a corrugated tin shed.
    The power is on the inside of the shed.

    I've just realised that I will need to put 4 cables through the tin to get this working. 2 power cables, for the light, twin+e into pir and switched live back into the lights. I have some 3+e which I could use and that would reduce to 3 cables.

    However, question remains - is there an easier way to get the cables through the tin without risk of cable wearing against tin Edge without need for 3 cable glands?


    Thanks.

    Why so many cables


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    #3
    funkey_monkey
    Registered Users Posts: 8,115 ✭✭✭funkey_monkey


    Treseemme. wrote: »
    Why so many cables

    Two separate led units to point each way down the passageway.
    Power into pir and the switched live from it to power the led units.

    A single led pir is not able to illuminate full length and trigger on entry from either end. Brother got them and had asked me to install.


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    #4
    punisher5112
    Registered Users Posts: 24,647 ✭✭✭✭punisher5112


    Run nymj 4 core.

    I would be putting the cables in conduit so no chance of getting cut.

    Just loop live from junction box to other light so you can have pir and switched.


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    #5
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    Will all the cables be coming out through one hole?


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    #6
    funkey_monkey
    Registered Users Posts: 8,115 ✭✭✭funkey_monkey


    punisher5112 wrote: »
    Run nymj 4 core.

    I would be putting the cables in conduit so no chance of getting cut.

    Just loop live from junction box to other light so you can have pir and switched.

    I was going to use some glands like attached to get the cables through the tin but was going there was another way to do it.

    I was planning on continuing 2+e from existing light up to a new junction box. Pull light cables through into this box. 3+e from box out to the pir supplying power and bring back in the switched live. Connect all up in junction box.

    I just don't have 3 glands at the minute and was wondering if there was another or better way to take the 2 power cables and the 3+e through the tin.


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    #7
    10-10-20
    Registered Users Posts: 6,800 ✭✭✭10-10-20


    Just gland the cables as you conceived as it will reduce the need for a drip-loop and rust protection on the bare metal edge of the 'tin'. Use externally rated cable on any external runs for the UV protection. Flat T+E won't suffice, it's too easily nicked.


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    #8
    funkey_monkey
    Registered Users Posts: 8,115 ✭✭✭funkey_monkey


    10-10-20 wrote: »
    Just gland the cables as you conceived as it will reduce the need for a drip-loop and rust protection on the bare metal edge of the 'tin'. Use externally rated cable on any external runs for the UV protection. Flat T+E won't suffice, it's too easily nicked.

    If the t+e is going through a gland there would be minimal chance of it getting nicked?


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    #9
    10-10-20
    Registered Users Posts: 6,800 ✭✭✭10-10-20


    Through the tin, yes, but it's not externally rated and it only has a single insulation sheath on the earth. "It should not be installed in areas where it could be subject to abrasion or blows without additional mechanical protection"
    CPC (T+E with the earth separately insulated) is the same.
    Plus it's a flat cable, so won't seal in the gland properly. Use NYM-J instead or SWA where it may be prone to being assaulted.
    https://www.eurosales.ie/products/3CNYMJCBL.html?filter_set[]=4776,4777,4778,4948
    https://www.eurosales.ie/products/3SWAAMCBL.html?filter_set[]=4776,4777,4778,4950


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