Waterproof Wire Harness
Sealed wire harnesses engineered for real-world immersion, wash-down, and outdoor exposure. Every assembly is tested per IEC 60529 before it ships.
“The most common failure mode in waterproof harnesses is not the connector seal itself — it is the transition point where the cable jacket meets the connector body. That is where water finds a path during thermal cycling, as the cable and housing expand at different rates. We solve this with redundant sealing: an O-ring at the connector interface plus an overmolded or adhesive heat-shrink transition that bonds to both surfaces.”
IP Ratings: What They Mean and How We Test
Each IP rating requires specific test conditions per IEC 60529. Here is exactly what we verify for every waterproof harness.
Dust tight + water jets
Outdoor signage, landscaping controls, building automation
Test method: Water jets from 6.3mm nozzle at 12.5 L/min from 3m distance for 15 minutes
Sealing approach: Gasket seals, heat shrink with adhesive lining
Dust tight + temporary immersion
Automotive underbody, outdoor IoT, ground-level equipment
Test method: Full immersion at 1m depth for 30 minutes, no ingress permitted
Sealing approach: O-ring sealed connectors, overmolded terminations
Dust tight + continuous immersion
Submersible pumps, underwater lighting, marine instruments
Test method: Continuous immersion at manufacturer-specified depth (we test to 3m / 72h)
Sealing approach: Dual O-ring, potted assemblies, overmolded strain relief
Dust tight + high-pressure wash
Food processing, vehicle wash-down, pharmaceutical clean rooms
Test method: 80°C water at 100 bar, spray nozzle at 10-15cm, all angles, per DIN 40050
Sealing approach: Fully potted or overmolded, stainless hardware, chemical-resistant jackets
Technical Capabilities
Our waterproof harness capabilities cover the full range from splash-resistant outdoor wiring to fully submersible cable assemblies.
Sealing Technologies
We select sealing methods based on your IP requirement, operating environment, serviceability needs, and budget. Most IP68 assemblies combine two or more approaches.
O-Ring Sealed Connectors
Factory-sealed connector housings from TE Deutsch, Amphenol, Molex, and Bulgin with verified O-ring groove tolerances
Best for: IP67-IP68 applications with field-serviceable connections
Overmolded Terminations
Custom-tooled overmolds in PUR, TPE, or silicone that bond directly to the cable jacket, eliminating mechanical sealing joints
Best for: IP68 submersible assemblies and high-vibration environments
Potted / Encapsulated Assemblies
Epoxy or polyurethane potting compounds fill the connector cavity, providing IP68 protection plus mechanical strain relief
Best for: Permanent installations where field servicing is not required
Adhesive-Lined Heat Shrink
Dual-wall heat shrink with hot-melt adhesive inner layer creates a watertight seal over splices, transitions, and breakouts
Best for: IP65-IP67 repairs, transitions between cable diameters, and branch sealing
Silicone Sealing Boots
Custom-moulded silicone boots that stretch over connectors and maintain seal integrity across -60°C to +200°C temperature swings
Best for: Extreme temperature environments and connectors that need periodic disconnection
Marine Navigation Harness for Commercial Vessel Retrofit
Challenge: A marine electronics integrator needed to replace the navigation and communication wiring on a 45m commercial fishing vessel during a scheduled dry-dock. The existing harness used consumer-grade connectors that had corroded after 4 years of salt-water exposure, causing intermittent GPS and radar failures at sea.
Solution: We designed a 14-connection harness using TE Deutsch DT series sealed connectors (IP68 rated) with silicone-jacketed marine-grade cable (tinned copper conductors, LSZH outer jacket). Each connector transition was overmolded in PUR, and all branch points used adhesive-lined heat shrink. The complete assembly was immersion tested at 3m for 48 hours, followed by 100% continuity and 500V insulation resistance testing.
Result: The harness has been in service for 18 months with zero electrical failures. Salt spray exposure during quarterly inspections shows no visible corrosion on any connector or transition point. The customer has since ordered identical harnesses for two additional vessels in their fleet.
Where Waterproof Harnesses Are Critical
We manufacture sealed harnesses for environments where moisture ingress causes downtime, safety risks, or equipment damage.
Marine & Offshore
Navigation systems, deck lighting, bilge pump cables, and subsea sensor harnesses rated to 3m+ continuous immersion
Automotive Exterior
Underbody sensor harnesses, EV charging cables, headlamp assemblies, and trailer tow connectors exposed to road spray
Outdoor & Solar
Solar tracker cables, EV charging stations, landscape lighting, and weather station harnesses with UV-stabilised jackets
Food & Beverage
IP69K-rated harnesses for conveyor sensors, fill-level probes, and CIP wash-down zones with FDA-compliant jacket materials
Pool, Spa & Irrigation
Submersible pump cables, underwater LED lighting harnesses, and irrigation valve wiring with chlorine-resistant insulation
Agriculture & Mining
Tractor implement cables, GPS antenna harnesses, and underground sensor wiring built for mud, dust, vibration, and moisture
From IP Requirement to Verified Assembly
Every waterproof harness project starts with understanding your real operating environment — not just an IP number. We review exposure conditions, temperature range, chemical contact, vibration, and serviceability requirements before recommending a sealing approach. For mixed exposure profiles, our harsh environment cable solutions process adds material, strain relief, and validation review beyond the IP rating. This prevents over-engineering (which drives up cost) and under-engineering (which drives up warranty claims).
- 1Environment review: exposure type, temperature, chemicals, UV, vibration, and service access requirements
- 2Connector and sealing method selection: O-ring, overmold, potting, or combination based on IP target and budget
- 3Material specification: cable jacket, conductor plating, strain relief, and hardware materials matched to environment
- 4Prototype build and IP test: immersion or pressure wash per IEC 60529, plus 100% electrical verification
- 5Production with incoming material verification, in-process seal checks, and final IP + electrical test
Why OEMs Choose Us for Sealed Assemblies
- Every waterproof harness is immersion or pressure tested before shipment — not sampled, tested 100%
- We document IP test conditions, duration, and results in each shipment's CoC (Certificate of Conformance)
- Custom overmold tooling in-house: AU$800-2,500 one-time, with 10-15 day turnaround for first samples
- Material selection support: we match jacket, conductor, and seal materials to your specific chemical and thermal exposure
- Scalable from 1-unit prototypes to 10,000+/month production with consistent sealing quality
- Combined capability: we build the harness, seal it, test it, and can integrate into a complete box build assembly
Related Resources
Automotive Wire Harness
Engine bay and underbody harnesses with IP67 sealing for road spray and temperature cycling
Overmolded Cable Assembly
Custom overmolded terminations for IP68 protection without mechanical sealing joints
Custom Wire Harness
Full custom design from schematic review through production, with waterproof options
Marine Cable Assembly
Tinned copper, LSZH jackets, and IP68 sealed connections for vessels and offshore platforms
Harsh Environment Cable Solutions
Material, sealing, strain relief, and test planning for moisture, vibration, UV, oil, and wash-down exposure
From the Case Bank
A US marine OEM sought a new supplier for custom wire harnesses and audio systems, initiating a rigorous multi-month evaluation process involving multiple business units.
The customer issued 6 separate RFQs over two months and engaged in a 64-email deep-dive technical thread, demanding strict weekly delivery, tariff mitigation, and cost competitiveness compared to incumbent suppliers.
Maintained rapid response times (1-2 days), proactively proposed a buffer stock strategy (advance ordering) to meet weekly delivery needs and mitigate tariff risks, and transparently presented alternative material options with cost benefits.
Successfully navigated the extensive qualification process, secured the tooling order, and transitioned into the prototyping phase for mass production.
- 6 separate RFQs
- 64-email technical thread
- 1-2 day response time
- weekly delivery requirement
Waterproof Harness FAQ
The right IP rating depends on actual exposure conditions: IP65 handles spray from any direction, IP67 survives temporary immersion to 1m for 30 minutes, IP68 covers continuous submersion at a specified depth (we test to 3m for 72 hours), and IP69K withstands high-pressure 80°C wash-down at 100 bar. We recommend describing your real operating environment rather than picking a rating number, so we can engineer the most cost-effective sealing solution.
We use five primary sealing approaches depending on application requirements: O-ring sealed connectors from TE Deutsch, Amphenol, or Molex; custom overmolded terminations in PUR/TPE/silicone; epoxy or polyurethane potting for permanent installations; adhesive-lined dual-wall heat shrink for transitions and repairs; and custom silicone sealing boots for extreme temperature ranges. Most IP68 assemblies combine two or more methods to achieve redundant sealing.
Yes. We regularly overmold or pot standard connectors to achieve IP67 or IP68 protection when sealed variants are unavailable or too expensive. This requires custom tooling (typically AU$800-2,500 one-time cost) but eliminates the need to redesign your mating interface. We verify seal integrity with immersion testing per IEC 60529.
Every waterproof harness is tested per IEC 60529 for its specified IP rating. IP67 assemblies undergo 1m immersion for 30 minutes, IP68 assemblies are tested at 3m depth for up to 72 hours, and IP69K assemblies face 80°C water at 100 bar per DIN 40050 Part 9. We also perform 100% electrical continuity and insulation resistance testing (minimum 100MΩ at 500V DC) before and after IP testing to confirm no degradation.
Prototype lead time is typically 10-15 working days for assemblies using off-the-shelf sealed connectors, or 3-4 weeks if custom overmold tooling is required. Production lead time is 2-4 weeks depending on volume and connector procurement. Unit cost varies widely by sealing method: O-ring sealed connectors add AU$2-15 per connection point, overmolding adds AU$3-8 per termination, and potting adds AU$5-20 per assembly depending on volume.
For outdoor UV exposure, we recommend PUR (polyurethane) or UV-stabilised TPE jackets, which resist degradation for 3,000+ hours under accelerated UV testing. For continuous submersion, silicone and cross-linked polyethylene (XLPE) offer the best long-term water resistance. Marine applications often require tinned copper conductors and LSZH (Low Smoke Zero Halogen) jackets to meet maritime safety standards. We select materials based on your specific chemical, thermal, and mechanical requirements.
Need Waterproof Cable Assemblies?
Send us your environment details, connector requirements, and target IP rating. We will recommend the most cost-effective sealing approach and provide a quote within 48 hours.