On Thursday, 24 November 2016 12:16:38 UTC, GB wrote:
My tip for choosing trunking, if a beginner (like me). Choose a size
that definitely looks big enough, then go up at least one size more. It
really beats buying the stuff twice.

Especially at crossovers, where leapfrogging one trunking over another really looks like I didn't plan the job.

Owain