PVC vs Galvanised Conduit: Current Capacity Enclosed In a Thermally Insulating Wall?

[Slinky]

Is there any advantage from the perspective of current ratings/de-ratings of using galvanised round conduit over same size PVC conduit? With both to be chased/buried in brick wall and plastered over?

If so, where is this specified?

Cheers

 

[loz2754]

They would both be classed as installation reference method A, so no real advantage in terms of current carrying capacity.

 

[telectrix]

brick and plaster is not thrmally insulated. cables in conduit are ref. B for single insulated, but there's no table for T/E in conduit, so it's an educated guess