Does outside buried conduit need sealing or a drain hole?

Ha ha, he wasn't worthy mate.

 

Must be another upgrade on the way...Screwfix Super Member!

 

Just responding to your posting. The epoxy resin joints that you dig up and replace have not been made correctly or has been disturbed. These joints are widely used by REC's and the failure rate due to leakage is small. Failure rate due to overload is significant. SWA cable sheath when undamaged is waterproof, just as an MDPE water pipe is waterproof, it's the terminations that are water resistant, if made correctly.

 

you are more than likely right there bob

 

I cannot believe it, i am obviously being groomed for better things. Who knows what we will have to see.

 

If it's only 4m can't you just re-trench it and bury the (XPLE) SWA direct? I'd bed it in a bit of fine sand myself

 

Nothing wrong with SWA in buried conduit, but the SWA is not made to be permanently submerged in water, so any water in the conduit really needs to drain away.

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.
Electric Cables in Water? | Prysmian Group

 

Fifteen years more than the design life in free draining soil.

 

I am wondering if longevity is a factor when the cable is below the frost line.