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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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  • 0

    Hi Tomas,

    My opinion would be that you have identified separate containment for LV and ELV cables. This straight away meets compliance in relation to cable sharing same containment and not factoring insulation of the lowest to highest voltage range.

    I would probably suggest 50-300mm seperation. 

    Sorry I haven't been able to give you further references just saw this question on my lunch break. 

  • 0 in reply to John W P

    Thank you, John, for your valuable information. As you mentioned, providing separate containment (metal perforated cable trays) for LV and ELV should meet compliance, as they are considered two separate “services.” The main issue is that I cannot find any regulation or requirement specifying the minimum separation distance between LV and ELV cable trays. BS 7671 refers to grouping of cables and separation within trunking, but it is difficult to find guidance specifically related to cable trays.

    Your suggestion is appreciated, and a separation of 50 mm or more seems reasonable for installation; however, I still need to support this with a specific regulation or standard for my project.

  • 0 in reply to Tomas Korytar

    Hi Tomas,

    Check out this discussion on relation to cable distances. It may provide further guidance there is a section from a fellow member gkenyon.

    engx.theiet.org/.../minimum-separation-distance-between-lv-power-230v-400v-and-unscreened-utp

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