NATIONAL Wire&Cable 18/2 Marine Wire, 18-Gauge Tinned Copper Duplex, 200 ft UV-Resistant Jacket

NATIONAL Wire&Cable 18/2 Marine Wire is a 200-foot spool of flexible, tinned-copper duplex cable engineered for saltwater, marine, automotive and RV electrical runs.

Built in New York since 1972, this 18-gauge, two-conductor sheathed cable combines fine-stranded copper conductors with a tinning finish and a heavy-duty, UV-resistant jacket so wiring stays durable in wet, coastal, and moving-vehicle environments. The product is designed for signal, lighting, and low-voltage power needs where corrosion resistance and flexibility matter most.

How does this wire hold up to saltwater and coastal conditions?

The conductors are individually tinned, which greatly reduces oxidation and galvanic corrosion common in marine environments. The outer jacket is formulated for water resistance and protection against spray and salt deposits, extending installation life along cabins, decks, and engine bays.

• Tinned copper strands resist corrosion better than bare copper in wet settings
• Heavy-duty waterproof jacket prevents salt ingress and moisture wicking
• UV-stable formulation helps avoid cracking or hardening from sun exposure

Is this cable flexible and easy to route through tight spaces?

Yes — the wire uses many fine copper strands and a soft jacket compound so it bends readily without kinking. That flexibility reduces stress at connection points and simplifies routing through bulkheads, conduits, and cramped cabinetry.

• Fine-stranded design for improved bend radius and fatigue resistance
• Soft yet durable jacket to ease pulling and reduce installation effort
• Duplex format keeps positive and negative conductors together for neat runs

What applications and voltages is 18/2 marine wire suited for?

This 18-gauge duplex cable is intended for low-voltage DC and control circuits commonly found on boats, campers, trailers, and automotive accessories. Typical uses include cabin lighting, instrument panels, pumps, sensors, stereo and accessory wiring where 18 AWG conductor capacity is appropriate.

• Interior and exterior lighting circuits (LEDs and incandescent fixtures)
• Low-current devices like switches, gauges, alarms, and sensors
• Accessory and auxiliary circuits in RVs, trailers, and marine craft

What manufacturing and quality features ensure reliability?

This cable is manufactured in the USA with decades of wiremaking experience, emphasizing consistent strand count, tinning coverage, and jacket integrity. The result is a repeatable product spec that installers and technicians can trust for predictable electrical and mechanical performance.

• Made in New York, USA — long-standing domestic production
• Individually tinned copper strands for improved corrosion resistance
• Precision extrusion for uniform jacket thickness and finish

Who is this for: NATIONAL Wire&Cable 18/2 Marine Wire is aimed at boat owners, marine electricians, RV and trailer DIYers, and automotive technicians who need a reliable, flexible 18-gauge duplex cable resistant to salt, moisture, and UV. Choose this 200-foot spool when you want domestically manufactured tinned-copper wiring for lighting, low-voltage circuits, and accessory installations where long-term durability and ease of routing matter.