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Cable arrangements

MG

Hi all,

I have this area where I need to route a large number of single phase three core armoured cables on a tray.

Is it acceptible if I arrange the cables in a trefoil formation making sure that each trefoil group has all three phases?

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    As these are single phase circuits - with presumably L, N and PE in each 3-core cable's cores - then there's no need to ensure each group is balanced across the 3 phases. Unlike were you've got single core cables, each 3-core cable is already balanced, so any grouping of those 3-core cables will be naturally balanced too.

    As Mike says, beware of grouping factors - not just within each group of 3 but between groups too unless there is significant free air between groups. It might be that a single layer touching isn't so bad after all.

        - Andy.

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    As these are single phase circuits - with presumably L, N and PE in each 3-core cable's cores - then there's no need to ensure each group is balanced across the 3 phases. Unlike were you've got single core cables, each 3-core cable is already balanced, so any grouping of those 3-core cables will be naturally balanced too.

    As Mike says, beware of grouping factors - not just within each group of 3 but between groups too unless there is significant free air between groups. It might be that a single layer touching isn't so bad after all.

        - Andy.

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