conduit 150mm

https://speakerfigure8cableview.novacrestiq.com/posts/choosing-the-right-speaker-figure-8-cable-for-your-stage-setup

When running 150mm conduit underground for heavy-duty electrical or data cables, the wider diameter makes pulling multiple lines through bends far easier and reduces the risk of damaging insulation. This size is common in commercial or industrial settings where future expansion might be needed, so the extra space in the pipe can save a lot of headache later.