XLPE Cable

The cable is safe as long as the outer cable insulation is intact and without damage or crack to where the water can penetrate into the cable. Though water can enhance degradation of cables but does not cause direct breakdown of the XLPE or EPR insulation, but rather reduces the dielectric strength of the insulation, eventually weakening the material to the point where it is susceptible to voltage surges that can initiate partial discharging. Partial discharging causes relatively rapid electrical degradation, leading to an electric tree and a faulted condition in weeks to months. Instantaneous failure in the weakened condition would only be expected under severe current surge conditions.

If you can isolate the cable ends from earth you can test the integrity of the sheath with a simple IR test. It's only way to allay you're fears.

Dear Mr.FADHEL,

The anser for your Question is NO. Mere water entry will not cause damage, provided the outer sheath is intact.

DAYANANDHAN.S