LLT ENGINEERING · Application analysis
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IP67 Connector Installation Sealing: What the Rating Covers
IP67 on a connector is a test-condition statement, not a blanket promise. It holds when the pair is correctly mated and locked, seals are intact, cable jacket diameter matches the sealing range, and entry sealing is finished. Unmated ports, long immersion, and washdown all need separate verification.
Scope and boundaries
Applies to outdoor-equipment connections built on IP67-rated circular connectors, such as LLT M-series panel-mount or in-line configurations exposed to rain, splash, and brief immersion. Excluded pending separate verification: unmated-state protection, long-term submersion, high-pressure or high-temperature washdown, explosive dust atmospheres, live mating, and corrosion, oil, or UV aging.
What the IP67 rating actually states
IEC 60529 defines IP67 as a degree of protection: the 6 covers dust ingress, the 7 covers temporary immersion, both under specified test conditions. Neither digit describes months outdoors, a pressure washer, or an unmated state. The standard defines the test; it does not certify that a particular orderable configuration passed it. That link has to come from the model's own specification.
For an installed outdoor connection, treat the rating as conditional. An IP67 rating stays valid only when the connector is correctly mated and locked, the seals are intact, the cable jacket diameter falls inside the sealing range of the chosen configuration, and the panel or cable-entry sealing is completed as specified. Remove any one condition and you no longer have an IP67 interface; you have a connector whose datasheet says IP67.
Sources: IEC 60529 — Degrees of protection provided by enclosures · Technical applicability
Installation checks that keep the seal valid
Unless the configuration is explicitly rated for live mating, work de-energized; LLT's stated condition is that connectors without clear load-mating support are operated power-off. Confirm the counterpart first: a shared series name such as M8, M12, or M16 does not establish compatibility. Interface dimensions, thread or locking structure, coding, pin count, and pin assignment all have to match the drawings on both sides.
- Keep end faces, seal rings, and locking features clean; sand trapped in the interface degrades mating and sealing.
- Confirm every seal is seated before locking, then lock fully with the structure the model provides, whether threaded, push-lock, or self-locking.
- Strip and terminate per the model drawing; torque and strip lengths are model-file values, not field estimates.
- After locking, recheck wiring, clamping, and assembly state per the project process.
Sources: LLT selection guide · Technical applicability · Connection and wiring methods
Cable jacket diameter is a sealing dimension
The cable entry seals on the jacket, so jacket outside diameter in millimeters is a sealing condition, while conductor cross-section in mm², or the AWG gauge number, is an electrical one. They are checked separately against separate model data. A cable whose jacket diameter is merely below the product maximum is not confirmed for sealing; the jacket OD must fall inside the sealing adaptation range of the selected configuration. Two cables with identical conductors can differ in OD because of core count, insulation, or jacket build, so the electrical choice never settles the sealing choice on its own.
Sources: Technical applicability · LLT selection guide
Where the protection boundary actually sits
The rating covers the mated interface under its test conditions; it does not extend to everything attached to it. Unmated ports are confirmed separately. The far end of the cable and the equipment's own openings sit outside the connector's rating. On panel-mount versions, the panel seal depends on cutout, panel thickness, and locking per the part-number drawing. An in-line cable pair has no panel seal at all, so panel data is irrelevant there, but both cable entries still have to be clamped and sealed.
If water can reach an unmated port, an out-of-range cable jacket, or an unfinished panel opening, stop and treat the interface as unprotected; if every sealing condition in the model drawing is met, the IP67 statement applies to that mated configuration under its stated test conditions.
Sources: Technical applicability · LLT selection guide
Conditions IP67 does not cover
Brief immersion, long-term underwater service, and high-pressure or high-temperature washdown are different tests. An IP67 statement answers only the first. If the duty involves spray cleaning or extended submersion, give the engineering team water depth, duration, temperature, medium, and cleaning method, then select a configuration with matching verification data. The available material defines IP67 conditions and LLT configuration checks, but it does not provide immersion depth, duration, or IP69K washdown evidence for a specific orderable part number, so those limits remain to be confirmed against the model datasheet.
Passing the IP6X dust requirement does not qualify a connector for explosive dust atmospheres. UV and salt-fog figures, such as the company-provided values of UV at least 1,000 hours and salt fog at least 480 hours, apply to specific material grades, colors, platings, and test records; accelerated hours do not convert into outdoor years. Oil, chemicals, and aging each need their own evaluation.
Sources: LLT selection guide · Technical applicability
Rating, test condition, certificate, configuration
Purchasing discussions conflate these four. The rating is a claim tied to test conditions. The test condition is the state under which that claim was demonstrated; for LLT models it sits in the product specification. A certificate, whether UL 2238, UL 1977, TÜV, or SAA, covers only the models, ratings, and structure versions named in it, while valid; CE follows the applicable regulations and the declaration of conformity. A configuration is the exact orderable setup of contacts, plating, seals, and cable range that any of these documents refers to. UL 94 V-0 on a plastic material does not mean the finished connector holds a UL product certification. When a project requires certified hardware, request the document for the specific SKU rather than relying on a series-level statement.
Sources: Technical applicability · LLT selection guide
Before you close the installation
If the duty stays within brief immersion and the installation meets the drawing, IP67 is a defensible choice. Anything harsher starts with the datasheet request, not with the two digits on the housing.
- Model datasheet: the IP rating and its test conditions for the exact configuration, not the series headline.
- Cable: conductor cross-section per core and jacket OD against the sealing adaptation range.
- Mounting: panel cutout and thickness for panel versions; clamping and independent cable support for in-line versions.
- Environment: immersion, washdown, UV, salt, and oils matched to verification data, not to the IP digit alone.
- For duties beyond current data, such as IP68 depth and duration or IP69K washdown, submit the duty conditions and request the corresponding test records.
Sources: LLT selection guide · Technical applicability · LLT public connector catalog
Frequently asked questions
Is an IP67 connector still protected when it is unplugged?
Assume not until confirmed. The rating normally applies to the correctly mated and locked pair with the specified cable; unmated-state protection is a separate check against the model documentation. Do not leave an unmated interface exposed outdoors on the strength of the IP mark.
Can an IP67 connector run permanently underwater?
Not on the IP67 statement alone. Long-term submersion is a different test condition from brief immersion. Provide water depth, duration, temperature, and medium, and choose a configuration whose verification data covers that duty; IP68 claims, where present, still need their stated depth, duration, and mating state.
Does IP67 mean the connector survives pressure washing?
No. High-pressure, high-temperature washdown is a separate test with its own water temperature, pressure, spray distance, and connection state. The currently checked LLT material contains no model-matched washdown evidence, so treat washdown duty as unconfirmed until matching test data is supplied.
The cable OD is below the connector's maximum, so is the seal fine?
Not necessarily. The jacket OD must fall inside the sealing adaptation range of the selected configuration; being under a maximum does not confirm the seal. Check conductor cross-section and jacket OD separately against the model data.