Whilst getting quotes for some marine-grade instrumentation cable yesterday, it struck me how cheap some of this stuff is compared to buying your standard two-core flex from West Marine/Whitworths/etc. For example:
sell this ordinary crappy 2-core 4mm2 probably-not-even-tinned stuff for A$2.60/m:
sell something like this in 2-core 4mm2 for A$4.20/m:
Conductor: Finely stranded tinned annealed copper
to IEC 60228 Class 5&6 & AS/NZS 1125.
Insulation: LSFLEX®R-30, Cross-linked, Polyolefinic, Thermoset, Flame Retardant, Low Smoke, Zero Halogen
(HF-90 to IEC 60092-351) Resists oil, skydrol, petrol, acid, sea water, ozone and UV
Sheath: LSFLEX®S-50, Polyolefinic, Flame Retardant, Low Smoke, Zero Halogen (SHF-1 to IEC 60092-359) Resists oil, skydrol, petrol, acid, sea water, ozone and UV.
Operating Temp: -40°C to +90°C
Voltage Rating: 250 Volts
Standards Approvals: LR, DNV, ABS, BV, GL, USCG, Transport Canada Marine Safety
Okay - it's a bit more expensive, not much for the sort of lengths you're talking about in a small boat - but this stuff is designed
for heavy use in the marine environment.
If you're thinking of re-doing your mast wiring or any other difficult bits that you really never want to do again for the life of the boat, it might be worth a little consideration.