anyone know of a manufacturer of 4 core aluminium power cable ? Can only seem to find single core.

My guess would be, you would have to sorce that from outside Thailand, Oz, NZ :-

http://www.alibaba.c...ower-cable.html

What would be wrong in having 4 single ali cables together if you need is such.

I can't think why you should need such a thing, if you were you outline what you want to do I'm sure the guru's will respond with alternatives.

He wants to run a 3-phase 4-wire supply underground in HDPE tube, Al if available would be significantly cheaper than the Cu alternative.

Al singles are available but the ones by Bangkok cable are not suitable for wet (underground) environments

He wants to run a 3-phase 4-wire supply underground in HDPE tube, Al if available would be significantly cheaper than the Cu alternative.

Al singles are available but the ones by Bangkok cable are not suitable for wet (underground) environments

Is there a suitable conduit to make "std" Al cable suitable for underground installation?