Cable in Buried Conduit

It is certainly not great that the ducts are flooded - while it means you need have no concerns about cable ratings (!) ; most cable designs are only designed to get wet, not for long term deep immersion, and as you say any jacket damage becomes very  serious, as armour will begin to corrode. Presumably all joints are above the high tide mark.

There are higher voltage single core AWAs (example) but if your cable just has BS6724 stamped on it then it probably isn't one of them.

Does the 1500V cable have any kind of insulation monitoring, or would the first sign of serious trouble be hot water or the ADS tripping off ? also is it 1500V between core and armour, or between a pair of singles, so the stress on any one core is half that total?

and  in this application is it part of the DC return path- what would happen if it went a bit high resistance at a point ? Trying to work out how serious the consequences of the most likely failure event would be.

I have looked for sheath damage on shielded cables in the past using an earth electrode and in effect testing for isolation to the armour of the affected cable, but that is not practical in a system that is already up and running if such testing was not designed in.

Mike.

It is certainly not great that the ducts are flooded - while it means you need have no concerns about cable ratings (!) ; most cable designs are only designed to get wet, not for long term deep immersion, and as you say any jacket damage becomes very  serious, as armour will begin to corrode. Presumably all joints are above the high tide mark.

There are higher voltage single core AWAs (example) but if your cable just has BS6724 stamped on it then it probably isn't one of them.

Does the 1500V cable have any kind of insulation monitoring, or would the first sign of serious trouble be hot water or the ADS tripping off ? also is it 1500V between core and armour, or between a pair of singles, so the stress on any one core is half that total?

and  in this application is it part of the DC return path- what would happen if it went a bit high resistance at a point ? Trying to work out how serious the consequences of the most likely failure event would be.

I have looked for sheath damage on shielded cables in the past using an earth electrode and in effect testing for isolation to the armour of the affected cable, but that is not practical in a system that is already up and running if such testing was not designed in.

Mike.