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Metal cable tray regulations

Tomas Korytar

Good morning,

Could anyone advise on the containment separation requirements for metal trays? I’ve been trying to find specific regulations or guidance on separation distances between LV and ELV cable trays, but haven’t been able to locate anything definitive. Does a standard or code require a minimum separation, segregation method, or specific containment practice for metal trays carrying LV vs ELV?

Any references to relevant standards or practical guidance would be greatly appreciated.

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    As others have said, cable trays and ladder would be more cable support than containment.

    In IEC60079 series of standards for explosive atmosphere electrical installations, so part 14 for the design, and construction and installation and initial verification of those installations. Again it mentions separation distances Min per cable function. Not containment or cable tray separation. It speaks about separation of basically cables whose circuit conductors are ignition capable and those that are not i.e. Intrinsically safe circuits. So as an absolute Min separation distance is 50mm between non-is and is circuits. Unless they are on a tray with an earthed metal partition or cables are armoured and screened.

    So separation of trays and you had cables right on the edge of each? I would be saying Min 50mm between trays, that way in the future and an installer put a cable on edge of a tray, then should be covered.

    Cheers GTB

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  • 0

    As others have said, cable trays and ladder would be more cable support than containment.

    In IEC60079 series of standards for explosive atmosphere electrical installations, so part 14 for the design, and construction and installation and initial verification of those installations. Again it mentions separation distances Min per cable function. Not containment or cable tray separation. It speaks about separation of basically cables whose circuit conductors are ignition capable and those that are not i.e. Intrinsically safe circuits. So as an absolute Min separation distance is 50mm between non-is and is circuits. Unless they are on a tray with an earthed metal partition or cables are armoured and screened.

    So separation of trays and you had cables right on the edge of each? I would be saying Min 50mm between trays, that way in the future and an installer put a cable on edge of a tray, then should be covered.

    Cheers GTB

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