Power cable types suitable for Boat marina

Presuming you mean the "fixed" installation cables, rather than the "shore cable" connecting the socket to a vessel.

BS 7671 section 709 lists thermoplastic and elastomeric insulation/sheath as being acceptable (with conditions) - I think XLPE is usually classed as thermosetting rather than thermoplastic though - I wonder if the intention was to exclude XLPE from that clause (it seems odd, since PE generally does better than PVC in wet conditions). For non-moving structures, most cable types including PVC sheathed MI, and thermoplastic sheathed armoured cables and "underground cables" in general appear to be acceptable.

On floating pontoons, overhead, non-sheathed cables in wiring systems, aluminium conductors and MI cables are explicitly prohibited.

Otherwise it seems to be just down to general environment - the necessary flexibility of the cables crossing from from shore to pontoon may depend on local conditions - is the pontoon exposed and move with every wave, or is there just a gentle up/down twice a day with the tides? Most black sheathed cables as OK in sunlight. Water resistance again depends on the conditions - usually between AD4 (splashes) to AD6 (exposed to waves) - although none is as demanding as complete immersion.

   - Andy.

Presuming you mean the "fixed" installation cables, rather than the "shore cable" connecting the socket to a vessel.

BS 7671 section 709 lists thermoplastic and elastomeric insulation/sheath as being acceptable (with conditions) - I think XLPE is usually classed as thermosetting rather than thermoplastic though - I wonder if the intention was to exclude XLPE from that clause (it seems odd, since PE generally does better than PVC in wet conditions). For non-moving structures, most cable types including PVC sheathed MI, and thermoplastic sheathed armoured cables and "underground cables" in general appear to be acceptable.

On floating pontoons, overhead, non-sheathed cables in wiring systems, aluminium conductors and MI cables are explicitly prohibited.

Otherwise it seems to be just down to general environment - the necessary flexibility of the cables crossing from from shore to pontoon may depend on local conditions - is the pontoon exposed and move with every wave, or is there just a gentle up/down twice a day with the tides? Most black sheathed cables as OK in sunlight. Water resistance again depends on the conditions - usually between AD4 (splashes) to AD6 (exposed to waves) - although none is as demanding as complete immersion.

   - Andy.