Metal cable tray regulations

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. 

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. 

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.

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