On board, salt water and constant moisture attack every exposed metal. A standard electrical cable designed for household use degrades rapidly at sea because its strands are not tinned. For a code-compliant installation, it is essential to use cables with tinned copper conductors, capable of resisting the galvanic corrosion that would quickly destroy a bare copper cable.
Correct cable cross-section sizing is an aspect that is often underestimated. A cross-section too small for the load and cable run causes voltage drops, which translate into dim lights or, worse, malfunctions in on-board electronic equipment. It is essential to calculate the load in amps and the distance between the battery and the load before proceeding with installation.
Crimping also requires care. A properly crimped terminal must become one unit with the cable. Using connectors with watertight heat-shrink tubing is the standard solution to prevent salty air from penetrating inside the cable, causing the typical green corrosion that interrupts electrical contact.
At Nautiba we analyze the technical compatibility of every component before making it available. If you have doubts about which cable cross-section to choose for your windlass or distribution panel, contact us. We help you avoid sizing errors, verifying that the system is balanced for your specific on-board needs.
How to ensure the longevity of the electrical system
- Use exclusively tinned copper strand cables to counter salt oxidation.
- Always verify that the cable cross-section is suited to the maximum current (amps) expected for the load and to the acceptable maximum voltage drop.
- Use crimping tools designed specifically for marine terminals, avoiding improvised joining methods such as electrical tape or soldering, which can crack under vibration.
- Protect every connection with adhesive-lined heat-shrink tubing, which hermetically seals against liquid entry.
- Route cables using cable trays and tie wraps, preventing cables from remaining in contact with the bilge or areas prone to water pooling.
Why prefer tinned copper over bare copper?
Bare copper reacts quickly with oxygen and salt, forming copper oxide that increases electrical resistance and degrades the contact. Tinned copper is protected by a thin layer of tin that prevents this process, ensuring conductivity over the long term.
How do I calculate the correct cable cross-section?
Cross-section depends on the current (amps) and the total circuit length. You need to consult sizing charts that relate voltage drop, distance, and load to avoid dangerous overheating.
Are screw connections reliable on a boat?
Hull vibrations tend to loosen screw connections over time. For a reliable system, prefer ring terminals or spade terminals crimped with specific tools, which offer superior mechanical grip and greater resistance to stress.
What does crimping correctly mean?
It means deforming the terminal around the cable so that the terminal metal and the copper strands of the cable are compressed together without leaving any gaps, eliminating air and forming a solid, lasting connection.
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