COMMON SENSE MARINE MW18-2R-200 Gauge Conductor Wire Duplex Round Copper Oxygen Fre 200-FT Tinned

( Brand: Common Sense Marine ), ( Manufacturer Part Number: MW18-2R-200 ), ( Part Type: Gauge ), ( Color: Yellow, White, Red ), ( Item Shape: Round ), ( Voltage: 600.0 ), ( Size: 200 Feet ), ( Material: Copper ), ( Unit Count: 1.0 ), ( Strands: Multi Strand ), ( Package Dimensions Lxwxh: 8.78x8.66x5.51 Inches ), ( Weight: 8.44 Pounds )

Review COMMON SENSE MARINE Gauge Conductor Wire 200 Ft Duplex Round Tinned Copper Oxygen fre

The **Common Sense Marine MW18-2R-200 18-Gauge Duplex Round Tinned Copper Oxygen-Free Wire** is a high-performance marine-grade electrical conductor meticulously engineered for demanding applications where reliability, corrosion resistance, and durability are paramount. Designed with **oxygen-free copper (OFC)**, this wire ensures superior conductivity and thermal stability, minimizing energy loss and reducing heat buildup critical factors for long-term performance in marine environments where moisture, salt, and fluctuating temperatures can accelerate degradation. The **18-gauge (1.024 mm ) duplex construction** combines two insulated conductors within a single jacket, offering a compact yet robust solution for wiring harnesses, control circuits, and auxiliary systems in boats, yachts, and offshore vessels. The **round tinned copper** cladding provides an additional layer of protection against oxidation and corrosion, extending the wire s lifespan while maintaining clean, secure connections that resist tarnishing and fretting common issues in humid or saltwater-exposed settings.

Ideal for **low-voltage applications**, such as lighting circuits, bilge pumps, navigation systems, and sensor wiring, this wire delivers a **continuous current rating of 13 amps (per conductor)** at 60 C, making it suitable for both temporary and permanent installations. The **duplex configuration** simplifies routing and reduces clutter, while the **thin-walled, flexible insulation** ensures easy bending around tight spaces without compromising structural integrity. Common Sense Marine s **marine-grade PVC jacket** is formulated to withstand UV exposure, abrasion, and chemical resistance, ensuring longevity even in harsh outdoor or below-deck environments. Whether used in recreational boats, commercial fishing vessels, or high-performance racing yachts, this wire offers a balance of **efficiency, safety, and endurance**, making it a trusted choice for marine electricians and DIY enthusiasts alike who demand nothing less than premium performance in their wiring solutions.

**Pros and Cons of buying a Common Sense Marine MW18-2R-200 18-Gauge Duplex Round Tinned Copper Oxygen-Free Wire (200 ft)**

1. **High-Quality Material:** The wire is made from **oxygen-free copper (OFC)**, which is highly conductive and resistant to oxidation. This ensures better electrical performance and longevity, especially in marine environments where corrosion is a concern.

2. **Tinned Copper:** The tinned coating provides an extra layer of protection against corrosion, moisture, and galvanic action. This is particularly useful in marine applications where exposure to saltwater and humidity is common.

3. **Marine-Grade Construction:** The **MW (Marine Wire)** designation indicates that this wire is designed to withstand harsh conditions, including vibration, moisture, and temperature fluctuations. It is often rated for **deep-cycle and high-vibration environments**, making it suitable for boats, RVs, and off-grid applications.

4. **Duplex Round Design:** The **duplex (two conductors in one jacket)** design simplifies wiring by reducing the number of cables needed for circuits. This can save time and space during installation.

5. **Thick Gauge (18 AWG):** While 18-gauge is relatively thin for high-current applications, it is still suitable for **low-to-medium current circuits** (e.g., lighting, sensors, control wires, and some 12V systems). It strikes a balance between flexibility and current-carrying capacity.

6. **Long Length (200 ft):** The extended length reduces the need for multiple splices or connectors, which can be a source of resistance and potential failure points. This is particularly useful in large installations where running wire long distances is necessary.

7. **Reliability for Marine Use:** Marine environments are demanding, and this wire is specifically engineered to handle the stresses of saltwater, vibration, and temperature changes better than standard household wire.

8. **Easy to Work With:** The tinned copper is easier to solder or crimp than bare copper, reducing the risk of oxidation during connections. The round design also makes it easier to handle and route through tight spaces.

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1. **Limited Current Capacity:** At **18 AWG**, this wire has a **low current-carrying capacity** (typically around **10 15 amps continuous**, depending on ambient temperature and insulation). It is **not suitable for high-power applications** such as alternators, starter motors, or heavy-duty appliances. For such uses, thicker gauges (e.g., 12 AWG or 10 AWG) are required.

2. **Not UL Listed for All Marine Applications:** While marine-grade wire is durable, it may not carry **UL or other third-party certifications** for specific uses (e.g., shore power connections). Always verify compliance with local electrical codes if connecting to mains power.

3. **Potential for Overheating in High-Demand Circuits:** If used in circuits with currents approaching its limit, the wire may overheat, especially in enclosed or poorly ventilated spaces. Proper fuse protection is essential.

4. **Higher Cost Than Standard Wire:** Marine-grade wire is more expensive than basic household or appliance wire due to its superior materials and construction. For non-marine applications, cheaper alternatives may suffice.

5. **Flexibility Trade-Off:** While 18-gauge is flexible enough for most wiring needs, it is not as pliable as thinner gauges (e.g., 20 AWG or 22 AWG). Repeated bending can eventually cause fatigue and breakage over time.

6. **Not Ideal for Long-Term Buried or Underground Use:** Although tinned copper resists corrosion, prolonged exposure to soil or moisture without additional protection (e.g., conduit) may still pose risks. For underground installations, consider **buried-rated wire** or conduit.

7. **Limited Availability of Connectors:** Finding proper connectors or terminals for 18-gauge marine wire may be more challenging than for standard gauges, especially in non-marine settings.

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The **Common Sense Marine MW18-2R-200 18-gauge duplex tinned copper wire** is an excellent choice for **low-to-medium current marine electrical applications**, particularly where **corrosion resistance, flexibility, and reliability** are critical. It is well-suited for:

- **12V lighting circuits**

- **Sensors and control wiring**

- **RV and boat interior wiring**

- **Non-critical power distribution**

- **Applications where vibration and moisture resistance are needed**

- **High-current applications** (e.g., alternator wiring, starter circuits)

- **Permanent buried or underground installations without protection**

- **Connections to mains power without proper certification**

- **Extreme high-temperature environments**

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- You are working on a **boat, RV, or off-grid system** where marine-grade durability is essential.

- Your wiring needs involve **low-voltage (12V) circuits** with currents under **15 amps**.

- You require **corrosion-resistant, tinned copper** for reliability in harsh conditions.

- You need a **long length (200 ft)** to minimize splices and simplify installation.

- You need to carry **high currents** (e.g., over 20 amps continuously).

- Your project involves **mains power (120V/240V) connections** without proper certification.

- You are working in an environment where the wire will be **buried without protection** or exposed to extreme abrasion.

- You require **ultra-thin, high-flexibility wire** (e.g., for delicate electronics).

- For **higher current needs**, consider **12 AWG or 10 AWG marine wire**.

- For **ultra-low current applications** (e.g., sensors), **20 AWG or 22 AWG tinned copper wire** may be more flexible.

- If connecting to **shore power**, ensure the wire meets **local electrical codes** and consider **UL-listed marine-rated cable**.

In summary, this wire is a **solid, high-quality choice for marine and low-current applications** but should not be used where its limitations in current capacity or environmental resistance could pose risks. Always pair it with **proper fusing, connectors, and installation practices** to ensure safety and longevity.

Details:

Boat wire is BC-5W2 compliant and UL 1426 listed, meets ABYC USCG specifications, which allows it to survive harsh environments. This dual conductor insulated boat wire uses Type III fine stranded copper wire, and features a durable PVC jacket. All of our boat wire is pre-tinned, which helps resist corrosion and length ens the life. UL standard 1426 listed, the recognized safety for boat wire, High PVC insulation resists moisture, flame, acid, alkali, oil and gasoline, Meets SAE, ABYC, Coast Guard requirements, 600 volts , 105 C dry, 75 wet, Made in USA, Superior Conductivity: Our precision-crafted oxygen-free copper 18/2 wire ensures top-notch conductivity, surpassing aluminum with lower resistance superior efficiency.

Premium PVC Shielding: Our top-tier insulation not only fends off moisture, flame, acid, alkali, oil, and gasoline but also boasts Rhos-compliant materials. This resilient white jacket ensures your wire remains safeguarded against abrasion, sunlight, and harsh chemicals. Illuminate your surroundings and power up adventures. Elevate your experience with our 18 AWG electrical wire, perfect for pontoon boats, bass boat trailers, trucks, RVs, vans, and ATV trailer systems.

It is for 600 volts , with a temperature tolerance of 105 C in dry conditions and 75 wet.

part #: mw182r200 prices

• $60.92-$140.38

specifications electricalmiscoz:

• brand: Common Sense Marine
• mpn: Mw18-2r-200
• part type: Gauge
• color: Yellow, White, Red
• item shape: Round
• voltage: 600.0
• size: 200 Feet
• material: Copper
• unit count: 1.0
• strands: Multi Strand
• package dimensions lxwxh: 8.78x8.66x5.51 Inches
• weight: 8.44 Pounds

shipping electricalmiscoz:

• type: Fixed
• class: Standard
• service: USPS First Class Letter
• cost: $0.00
• carrier: USPS
• transit: 3-5 Days

returns electricalmiscoz:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days
• method: Money back

general electricalmiscoz:

• Electrical Supplies > Electrical Wire Cable Accessories > Electrical Wire Cable Connectors
• condition: New

offer electricalmiscoz:

• availability: In Stock
• quantity: 1
• sold: 0
• options: Ship-to-home
• started: May 26, 2026

seller electricalmiscoz:

• rating: 99.3%
• # reviews: 169
• city: Chicago, Illinois

payments electricalmiscoz:

• credit card: Diners-club
• other
• wallet: Google-pay

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