I used to work with a lot of aluminium cables in the comms underground network, horrible stuff with age it more or less turns to powder and falls apart.
IMO oval tube is used in domestic situations I always use it. If a client wanted the potential to be able to rewire with minimum disruption and mess I would use 20mm round full conduit system in singles. Only disadvantage with this is its much harder for any alterations not that its impossible...
I drilled through a lead water main in a plastered wall feeding a cold water tank in a hospital in North London 40 years ago.
It was due to me drilling a fixing for my metal clad socket back box, all surface conduit.
Mains pressure you can imagine the amount of water spewing out all through my...
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