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Anyone know where I can get 32mm ID/37mm OD underground electric cable ducting from in shorter lengths, cheapest I found is amazon but everywhere seems to do minimum 50m, I only need 15m and rarely use it.
 
I presume you are using SWA cable. Why the ducting?
 
The ducting is because its very wet clay soil manufacturer of SWA does say:

Armoured cables
While Prysmian’s Low Voltage and Medium Voltage armoured cables, with both LSOH and PVC sheaths, are suitable for installation in ‘free draining soils’ they are not recommended for installation in permanently waterlogged ground, such as in clay soils or below the water-table. In free draining soils a cable can be expected to achieve Prysmian’s estimated minimum design life of 25 years for a cable fully and continuously loaded. However, in permanently waterlogged ground a cable’s design life will prematurely shortened by water migrating through the cable sheath and potentially corroding the cable’s armour.

Plus I want to take the ducting up the wall and into the house.. the 25m of double wall stuff for £30 + P&P seems to be the winner..
 

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