Officially, it is not intended for long term immersion, rather for 'free draining soils'
Practically this Prysmian web note observes that medium density polythene insulation (and so XPLE) is much better than PVC in terms of the slow permeation of water, and meeting a 25 year life immersed is a reasonable expectation.
And there are plenty of sites where the cables are in ducts that are full of water for a good fraction of the year.
IF the pond has a liner, and the ground beneath it drains, then if it is possible then a route under the pond liner may be preferred.
If it has to lay on the bottom of the kind of pond which gets weeded and so forth, I'd put it in some sort of flexiduct, to reduce the risk of the outer jacket getting damaged.
Officially, it is not intended for long term immersion, rather for 'free draining soils'
Practically this Prysmian web note observes that medium density polythene insulation (and so XPLE) is much better than PVC in terms of the slow permeation of water, and meeting a 25 year life immersed is a reasonable expectation.
And there are plenty of sites where the cables are in ducts that are full of water for a good fraction of the year.
IF the pond has a liner, and the ground beneath it drains, then if it is possible then a route under the pond liner may be preferred.
If it has to lay on the bottom of the kind of pond which gets weeded and so forth, I'd put it in some sort of flexiduct, to reduce the risk of the outer jacket getting damaged.
