Galvanised Conduit in house conduit factors

[7029 dave]

Your capacity factor is 460 20mm conduit, so work out your cable sizes solid/ stranded.How many bends etc.

 

[Andy78]

what do the regs say about mech protection? All cables in house run along tge top of tge wall set back into the brickwork witb a wooden cover due to concrete ceelings, I could joint there, but I hate joints where avoidable seems like bad practice

Well any joints would clearly need to be in an enclosure. If you were jointing at the start of a conduit run then a good idea for an enclosure would be a conduit box.
Not trying to be obvious, just not sure what you are asking.

 

[Engineer54]

Conduit runs with 2 or more 90 degree bends, should have a space factor not exceeding 40%!!