{"product_id":"sea-dog-12-3-awg-triplex-marine-wire-100ft-tinned-copper","title":"Sea-Dog 12\/3 AWG Triplex Marine AC Cable, 100 Feet, Tinned Copper","description":"\u003cp class=\"nvn-hero\"\u003eSea-Dog's 12\/3 AWG triplex is flat, tinned-copper marine cable for AC wiring on a boat. Three 12-gauge stranded conductors, color-coded white, green, and black, on a 100-foot spool. Tinned copper shrugs off salt-air corrosion, the flat shape routes easily through tight spaces, and the UL and ABYC stamp is what a surveyor wants to see.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThis is Sea-Dog's 12\/3 AWG triplex, a flat marine cable built for running alternating current around a boat. You get three 12-gauge stranded conductors, color-coded white, green, and black, wrapped in a flat encasement that lies against a bulkhead or slips through a chase without fighting you. It comes as a 100-foot spool, and every strand is tinned copper. That tinning is the whole point on the water.\u003c\/p\u003e\n\u003cp\u003eHere's why tinned matters. Bare copper corrodes in salt air. It doesn't have to sit in bilge water, just breathe the same damp air, and over a couple of seasons you'll see green creep up under the insulation and resistance climb at the terminals. Tinned copper puts a thin coat of tin over every strand, so the wire shrugs off that corrosion and keeps carrying full current years down the road. It's the difference between a wiring job you do once and one you're back chasing with a meter every spring.\u003c\/p\u003e\n\u003cp\u003eThe flat triplex shape earns its keep in tight spaces. We've pulled a lot of this through narrow lazarettes and along stringers where a round cable would bunch up and bind. Flat lies down and stays put. One thing to respect: don't fold it into a sharp bend during the pull. Flat cable will kink if you crank it around a hard corner, so keep your radius easy and it'll feed clean.\u003c\/p\u003e\n\u003cp\u003eWhere does 12\/3 fit? This is your cable for AC branch circuits, shore-power feeds to a sub-panel, genset runs, and inverter output on small to mid-size boats. The three-conductor setup follows the standard AC color code, white for neutral, black for hot, green for ground, so anyone who opens the panel later can read the run at a glance. That matters for the next tech, and it matters at survey time. The UL 1426 and ABYC stamp on this cable is exactly what a surveyor wants to see on a documented boat, and some owners tell us it smooths the conversation with their insurer too.\u003c\/p\u003e\n\u003cp\u003eWhy 12 gauge and not something heavier? Twelve AWG is the sweet spot for a lot of onboard AC circuits, receptacle runs, a battery-charger feed, a modest genset branch, where you want real current capacity without wrestling stiff, thick cable through the boat. For longer runs or higher-draw loads you'd step up to a heavier gauge to keep voltage drop in check, but for typical branch work 12\/3 hits the mark. Match the gauge to the load and the distance, and this cable handles the everyday AC wiring most boats actually need.\u003c\/p\u003e\n\u003cp\u003eAnd it's genuine marine-grade wire, not automotive cable pressed into service. Automotive wire uses fewer, coarser strands and bare copper, which is fine in a dry car and a poor choice in a damp bilge. Marine cable like this uses finer, more flexible stranding that stands up to constant vibration and flexing, plus the tinning that keeps corrosion out. On a boat, that distinction is the difference between a circuit you trust and one you don't.\u003c\/p\u003e\n\u003cp\u003eTermination is straightforward if you do it right. Strip the flat jacket with a sharp utility knife rather than side-cutters, which can crush the three conductors underneath. Then use adhesive-lined heat shrink over every terminal to seal out moisture. The 12-gauge conductors drop cleanly into standard screw terminals and terminal blocks without needing ferrules, so wiring up a fuse block or a panel is quick work.\u003c\/p\u003e\n\u003cp\u003eA note on planning your buy. A 100-foot spool is plenty for most jobs, but on a 30 to 35-foot boat you may finish with 20 or 30 feet left over. That's fine if you've got other AC runs to do, and honestly it's nice to have spare marine-grade wire on the shelf. Where the cable runs past a sharp chine edge or any hard corner in the structure, protect the jacket with split loom. Left unprotected, the outer jacket can chafe and split at a sharp edge after a few seasons, and a little loom up front saves you that headache.\u003c\/p\u003e\n\u003cp\u003eBottom line: if you're wiring AC on a boat and you want it done to code and done once, this is the right cable to reach for. Tinned copper, flat and easy to route, correctly color-coded, and stamped to the standards that actually matter out there.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eThree 12 AWG stranded conductors in a flat triplex encasement, sized for onboard AC branch circuits\u003c\/li\u003e\n  \u003cli\u003eTinned copper stranding resists salt-air corrosion and electrolysis for a wiring job that lasts\u003c\/li\u003e\n  \u003cli\u003eFlat construction lies against bulkheads and stringers and routes easily through tight lazarettes and chases\u003c\/li\u003e\n  \u003cli\u003eStandard AC color code, white for neutral, black for hot, green for ground, so the run reads clearly at the panel\u003c\/li\u003e\n  \u003cli\u003e100-foot spool covers most branch-circuit jobs with wire to spare\u003c\/li\u003e\n  \u003cli\u003eFine, flexible marine-grade stranding stands up to constant vibration and flexing\u003c\/li\u003e\n  \u003cli\u003eUL 1426 and ABYC certified, exactly what a surveyor wants to see on a documented boat\u003c\/li\u003e\n  \u003cli\u003e12-gauge conductors drop into standard screw terminals and fuse blocks without ferrules\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Sea-Dog reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this cable for AC or DC wiring?\u003c\/summary\u003e\n    \u003cp\u003eIt's built for AC. The white, green, and black conductors follow the standard AC color code, white for neutral, black for hot, and green for ground. That's the setup you want for shore-power feeds, genset runs, and inverter output.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the tinned copper actually do for me?\u003c\/summary\u003e\n    \u003cp\u003eTinning coats every copper strand with a thin layer of tin, so the wire resists the corrosion that eats bare copper in salt air. On a boat that means lower resistance at the terminals and a run that keeps carrying full current for years instead of turning green under the insulation.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill this cable pass a survey?\u003c\/summary\u003e\n    \u003cp\u003eIt carries the UL 1426 and ABYC stamp, which is what a surveyor looks for on a documented boat. Install it to code with proper terminations and it holds up to that inspection.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy choose flat triplex over round cable?\u003c\/summary\u003e\n    \u003cp\u003eFlat cable lies down against a bulkhead or stringer and feeds through narrow spaces where round cable bunches and binds. Just keep your bends easy during the pull, since flat wire can kink if you crank it around a sharp corner.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I strip the flat jacket without damaging the conductors?\u003c\/summary\u003e\n    \u003cp\u003eUse a sharp utility knife to open the flat encasement rather than side-cutters, which can crush the three conductors underneath. Then seal each terminal with adhesive-lined heat shrink to keep moisture out.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need ferrules to land these in a terminal block?\u003c\/summary\u003e\n    \u003cp\u003eNo. The 12-gauge conductors drop cleanly into standard screw terminals and fuse blocks without ferrules, so wiring up a panel is quick.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow long is the spool, and will 100 feet be enough?\u003c\/summary\u003e\n    \u003cp\u003eIt's a 100-foot spool, plenty for most branch-circuit jobs. On a 30 to 35-foot boat you may finish with 20 or 30 feet to spare, which is handy for the next AC run.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it for a shore-power sub-panel or a genset feed?\u003c\/summary\u003e\n    \u003cp\u003eYes, that's exactly what 12\/3 is for on small to mid-size boats: AC branch circuits, shore-power feeds to a sub-panel, genset runs, and inverter output. For longer runs or higher-draw loads, step up to a heavier gauge to control voltage drop.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eShould I protect the cable where it crosses a sharp edge?\u003c\/summary\u003e\n    \u003cp\u003eYes. Run split loom anywhere the cable passes a chine edge or hard corner. The outer jacket can chafe and split at a sharp edge over a few seasons, and a little loom up front prevents that.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eSea-Dog 12\/3 AWG Triplex Marine AC Cable, 100 Feet, Tinned Copper\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSea-Dog\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e8012302\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e035514802475\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConductor Gauge\u003c\/th\u003e\n\u003ctd\u003e12 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNumber of Conductors\u003c\/th\u003e\n\u003ctd\u003e3 (Triplex)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConductor Type\u003c\/th\u003e\n\u003ctd\u003eStranded Tinned Copper\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWire Construction\u003c\/th\u003e\n\u003ctd\u003eFlat Encasement\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLength\u003c\/th\u003e\n\u003ctd\u003e100 Feet\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConductor Colors\u003c\/th\u003e\n\u003ctd\u003eWhite \/ Green \/ Black\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eAC (Alternating Current)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCertification\u003c\/th\u003e\n\u003ctd\u003eUL 1426 \/ ABYC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eMarine Triplex Cable\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eOwner Reviews\u003c\/h2\u003e\n\u003cdiv class=\"nvn-reviews\"\u003e\n  \u003cp class=\"nvn-rating-summary\"\u003eAverage rating 4.7 out of 5 across 63 owner reviews.\u003c\/p\u003e\n  \u003cdiv class=\"nvn-review\"\u003e\n    \u003cdiv class=\"nvn-review-meta\"\u003e\n\u003cspan class=\"nvn-review-stars\"\u003e★★★★★\u003c\/span\u003e \u003cspan class=\"nvn-review-author\"\u003eJ. Barrett\u003c\/span\u003e \u003cspan class=\"nvn-review-date\"\u003e2025-06-12\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cp class=\"nvn-review-body\"\u003eThe flat shape pulled through my lazarette a lot easier than round cable. Ran a new AC branch to the sub-panel and it lay flat against the stringer without fighting me.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"nvn-review\"\u003e\n    \u003cdiv class=\"nvn-review-meta\"\u003e\n\u003cspan class=\"nvn-review-stars\"\u003e★★★★★\u003c\/span\u003e \u003cspan class=\"nvn-review-author\"\u003eM. Alvarez\u003c\/span\u003e \u003cspan class=\"nvn-review-date\"\u003e2025-03-08\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cp class=\"nvn-review-body\"\u003eTinned copper is the only way to go on a boat. I rewired my genset feed two seasons ago and the terminals still look brand new, no green creep at all.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"nvn-review\"\u003e\n    \u003cdiv class=\"nvn-review-meta\"\u003e\n\u003cspan class=\"nvn-review-stars\"\u003e★★★★☆\u003c\/span\u003e \u003cspan class=\"nvn-review-author\"\u003eR. Coleman\u003c\/span\u003e \u003cspan class=\"nvn-review-date\"\u003e2025-08-01\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003cp class=\"nvn-review-body\"\u003eGood marine cable and correctly color-coded for AC. Just remember to run split loom where it crosses a sharp edge, I learned that one the hard way. Strips clean with a sharp knife.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this cable for AC or DC wiring?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's built for AC. The white, green, and black conductors follow the standard AC color code, white for neutral, black for hot, and green for ground. That's the setup you want for shore-power feeds, genset runs, and inverter output.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does the tinned copper actually do for me?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Tinning coats every copper strand with a thin layer of tin, so the wire resists the corrosion that eats bare copper in salt air. On a boat that means lower resistance at the terminals and a run that keeps carrying full current for years instead of turning green under the insulation.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will this cable pass a survey?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It carries the UL 1426 and ABYC stamp, which is what a surveyor looks for on a documented boat. Install it to code with proper terminations and it holds up to that inspection.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why choose flat triplex over round cable?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Flat cable lies down against a bulkhead or stringer and feeds through narrow spaces where round cable bunches and binds. Just keep your bends easy during the pull, since flat wire can kink if you crank it around a sharp corner.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I strip the flat jacket without damaging the conductors?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Use a sharp utility knife to open the flat encasement rather than side-cutters, which can crush the three conductors underneath. Then seal each terminal with adhesive-lined heat shrink to keep moisture out.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need ferrules to land these in a terminal block?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. The 12-gauge conductors drop cleanly into standard screw terminals and fuse blocks without ferrules, so wiring up a panel is quick.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How long is the spool, and will 100 feet be enough?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a 100-foot spool, plenty for most branch-circuit jobs. On a 30 to 35-foot boat you may finish with 20 or 30 feet to spare, which is handy for the next AC run.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use it for a shore-power sub-panel or a genset feed?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, that's exactly what 12\/3 is for on small to mid-size boats: AC branch circuits, shore-power feeds to a sub-panel, genset runs, and inverter output. For longer runs or higher-draw loads, step up to a heavier gauge to control voltage drop.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Should I protect the cable where it crosses a sharp edge?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. Run split loom anywhere the cable passes a chine edge or hard corner. The outer jacket can chafe and split at a sharp edge over a few seasons, and a little loom up front prevents that.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"Product\",\n    \"name\": \"Sea-Dog 12\/3 AWG Triplex Marine AC Cable, 100 Feet, Tinned Copper\",\n    \"review\": [\n        {\n            \"@type\": \"Review\",\n            \"author\": {\n                \"@type\": \"Person\",\n                \"name\": \"J. Barrett\"\n            },\n            \"reviewRating\": {\n                \"@type\": \"Rating\",\n                \"ratingValue\": \"5\",\n                \"bestRating\": \"5\"\n            },\n            \"datePublished\": \"2025-06-12\",\n            \"reviewBody\": \"The flat shape pulled through my lazarette a lot easier than round cable. Ran a new AC branch to the sub-panel and it lay flat against the stringer without fighting me.\"\n        },\n        {\n            \"@type\": \"Review\",\n            \"author\": {\n                \"@type\": \"Person\",\n                \"name\": \"M. Alvarez\"\n            },\n            \"reviewRating\": {\n                \"@type\": \"Rating\",\n                \"ratingValue\": \"5\",\n                \"bestRating\": \"5\"\n            },\n            \"datePublished\": \"2025-03-08\",\n            \"reviewBody\": \"Tinned copper is the only way to go on a boat. I rewired my genset feed two seasons ago and the terminals still look brand new, no green creep at all.\"\n        },\n        {\n            \"@type\": \"Review\",\n            \"author\": {\n                \"@type\": \"Person\",\n                \"name\": \"R. Coleman\"\n            },\n            \"reviewRating\": {\n                \"@type\": \"Rating\",\n                \"ratingValue\": \"4\",\n                \"bestRating\": \"5\"\n            },\n            \"datePublished\": \"2025-08-01\",\n            \"reviewBody\": \"Good marine cable and correctly color-coded for AC. Just remember to run split loom where it crosses a sharp edge, I learned that one the hard way. Strips clean with a sharp knife.\"\n        }\n    ],\n    \"aggregateRating\": {\n        \"@type\": \"AggregateRating\",\n        \"ratingValue\": \"4.7\",\n        \"reviewCount\": \"63\",\n        \"bestRating\": \"5\"\n    }\n}\n\u003c\/script\u003e\n","brand":"Sea-Dog","offers":[{"title":"Default Title","offer_id":45057498644573,"sku":"2008375","price":125.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_4d095359-f884-4a10-bba7-af39ddd931e0.png?v=1789488552","url":"https:\/\/nvnmarine.com\/products\/sea-dog-12-3-awg-triplex-marine-wire-100ft-tinned-copper","provider":"NVN Marine","version":"1.0","type":"link"}