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Installing AWA in Trefoil

gibb01

Hi All,

We have a project installing a 630A Panel board from an LV panel board within the same room.  Due to space constraints we no longer think the 300mm SWA we were looking to install is going to be physically feasible.  So we've been looking at running 300mm AWA's in Trefoil instead. It's a short run of around 13m & the panel board is going to contain a mixture of different loads.

We're obviously using the Aluminum glands & terminating into an Aluminum plate either end, however not having had to install cables in trefoil before - I'm not sure if there is anything else we need to be mindful about. 

It's being installed on a 450mm ladder & I've checked within table 4C5 for spacing factors. I'm unsure if the neutral should be installed as close as possible to the trefoil? It's also been mentioned that Quad cleats are available to include the Neutral, Lastly it's been mentioned about potential single point bonding of the conductors - again something I've never had to do before.

I will be looking to get a design carried out, I just wondered if anyone had advice as it's not something we've had the need to carry out beforehand - So unsure whether there any pros / cons of doing this way as opposed to a standard 4 core SWA (Other than the physical impracticalities!)

Many thanks in advance. 

Tim

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  • 0

    Broadgage's comments are helpful.

    Do be mindful of the fault rating of any cleats you select; reputable manufacturers will state it. If you do use a cleat per core (rather than a quad or trefoil cleat) make sure they're not steel ones designed for multicore cables. Personally I would also be mindful of routing around other steelwork, for example support struts across the cable entry and incidental loops like bolts securing cleats (others may consider this OTT)

    I presume for this size you're not looking at parallel conductors but if you are the phase rotation and placement of conductors within the bundle can affect the current sharing. Normally the neutral is bundled with the line conductors or fixed adjacent to the trefoil.

    For the length - and I don't know what your load or protection is - I doubt you're considering reduced neutral but it is an easier conversation with singles. More likely with parallel circuits, e.g. 3 per phase and 2 neutral. You may require overload protection for the neutral though.

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  • 0

    Broadgage's comments are helpful.

    Do be mindful of the fault rating of any cleats you select; reputable manufacturers will state it. If you do use a cleat per core (rather than a quad or trefoil cleat) make sure they're not steel ones designed for multicore cables. Personally I would also be mindful of routing around other steelwork, for example support struts across the cable entry and incidental loops like bolts securing cleats (others may consider this OTT)

    I presume for this size you're not looking at parallel conductors but if you are the phase rotation and placement of conductors within the bundle can affect the current sharing. Normally the neutral is bundled with the line conductors or fixed adjacent to the trefoil.

    For the length - and I don't know what your load or protection is - I doubt you're considering reduced neutral but it is an easier conversation with singles. More likely with parallel circuits, e.g. 3 per phase and 2 neutral. You may require overload protection for the neutral though.

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