what wire for 110 v system ?

[arch007]

the cable for my 110 v boat system from the power inlet to the
breaker panel is very old and i want to replace it.

what kind of cable should i get and where to buy ？

[stormalong]

If it is a 30 amp inlet you need 10-3 (10 gauge three conductor) marine rated (UL-1426) triplex cable. The standard colors and "polarity" are black - hot, white - neutral and green - ground.

There are many sources with an amazing range of prices. As long as you buy UL-1426 rated wire you are good.

[CHM]

Agree with stormalong. Must be tinned stranded boat cable. Never ever standard copper or aluminum you would use on your home.

[Scott Berg]

While I agree that tinning is a very good thing (and we use only tinned wire) it is not a current ABYC or USCG Requirement, just (very) good engineering practice.

[Nicholson58]

If you are sailing fresh water only you might consider non-tinned. I don’t recommend it. Marine wire is both tinned and more and finer wire so that is more flex tolerant.

[Perfect Ride]

You might also want to spend some time considering the various marine wire termination techniques. They can be of similar importance to the wire selection.