CONEPY 18 Gauge Marine Wire 18/3 Triplex 15.2 m — Tinned Copper, UV & Saltwater Resistant

CONEPY 18/3 marine wire is a 50-foot, tinned-copper triplex cable built to resist saltwater, UV, abrasion, and heat for dependable boat, RV, and outdoor electrical runs.

Designed for nautical and other demanding environments, this 18 AWG, three-conductor cable pairs fine-stranded, oxygen-free tinned copper with a thick PVC jacket to balance flexibility and long-term durability. It meets common marine and safety standards and supports low-voltage systems including 5V, 12V and 24V setups, with insulation and ratings suitable for harsh conditions.

How does this cable stand up to saltwater and sunlight?

The cable combines tinned copper strands and a heavy-duty PVC jacket to minimize corrosion and surface degradation. Tinning protects the conductor from oxidation, while the jacket resists UV exposure and chemical attack common in marine environments.

• Tinned, oxygen-free copper reduces corrosion in wet conditions
• Thick PVC jacket resists UV, abrasion, and salt spray
• Operating temperature range from -40°F to 221°F for seasonal extremes

What electrical specifications and safety ratings does it have?

This 18/3 triplex cable uses 51 strands of 0.14 mm tinned copper per conductor for effective current delivery and flexibility. It carries a 600V rating and is compatible across common low-voltage systems, while meeting several marine and safety standards.

• Each conductor: 0.78 mm² cross-sectional area (18 AWG) with 51 strands
• Rated voltage up to 600V; suitable for 5V, 12V, 24V applications
• Certifications and ratings: UL 1426, SAE, ABYC; IP68 waterproof; VW-1 flame retardant

Will it be easy to route, terminate, and use aboard a boat or in a van?

The fine-stranded construction keeps the cable flexible for routing through tight spaces and around bends without kinking. The PVC jacket is thick enough for protection yet pliable enough for clean terminations and crimping with standard marine connectors.

• Fine-stranded copper makes bending and routing simpler in confined runs
• PVC jacket maintains flexibility for neat terminations and crimps
• 50-foot length covers many single-run installations without splicing

What common uses is this cable suited for?

The 18/3 triplex format is versatile for many low-voltage systems where three conductors are needed. It works well for lighting, accessories, speakers, and control circuits in marine, automotive, and off-grid applications.

• Boat circuits: lighting, navigation lights, bilge pump control, instruments
• RVs and vans: interior lighting, speakers, auxiliary accessories
• Off-grid systems: low-voltage solar inverters, LED runs, sensor wiring

Who is this for: CONEPY 18/3 marine wire is aimed at boat owners, RV and van converters, electricians, and DIY installers who need a flexible, corrosion-resistant cable that meets marine safety standards. If you require a 50-foot, three-conductor run that balances conductivity, durability, and ease of installation for harsh outdoor or marine settings, this cable is a practical choice.