Ingress protection ratings get treated like a property of the camera. In practice the rating describes the assembled product as tested: the housing, the lens window, the gasket — and the cable entry. The cable gland, the junction box behind it and the field-terminated connector are parts the installer chooses, and a camera that tests IP66 in the factory can let water in through a gland that was never rated for anything.
What the rating actually certifies
An IP66 rating means the tested unit, as assembled, withstood dust ingress and powerful water jets. It does not mean every camera of that model remains IP66 after an installer substitutes the gland, re-terminates the cable with a different connector, or routes the tail through a junction box with an unsealed knock-out. The most common water ingress in the field is not through the housing at all; it runs down the cable, collects at a poorly sealed gland, and enters the camera from behind.
That failure mode has a signature: corrosion on the connector and a camera that fails weeks after heavy rain, long after installation day, when nobody connects the weather to the part.
The gland is a specification item
Glands differ in more than diameter. Nylon versus brass bodies, NBR versus silicone seals, clamping ranges matched to the actual cable jacket, and whether the seal is on the jacket or on an inner core — each choice changes where the seal holds. A cable with a moulded connector at the camera end cannot pass through a sealing gland at all, which is why factory-terminated tails need a different sealing strategy than field-cut cable.
The practical request to a manufacturer is a stated gland specification with the camera: body material, seal material, clamping range, and torque. And a note in the installation sheet that field re-termination requires a gland re-seal, not just a hand-tight fit.
Junction boxes inherit the problem
Where the camera uses a separate mounting box — standard on bullet and PTZ installs — the ingress chain continues past the gland. A box with an unsealed knock-out, a lid gasket compressed unevenly, or a cable entering from the top without a drip loop turns the box into a water trap pointed at the camera's own cable entry. Drip loops and bottom-entry routing are installer habits, but a supplier can influence them with the mounting template and the manual, which cost nothing to change and prevent a whole category of tickets.
What this means for buyers
Wholesale buyers usually verify the rating on the datasheet and stop there. Two additions close the gap. First, ask whether the camera was tested as an assembly with the supplied gland, and whether alternative glands were considered. Second, ask what the installation documentation says about cable entry, drip loops and re-termination, because the manual is part of the product's real-world ingress rating whether or not the certificate mentions it.
A manufacturer who has fielded water-ingress complaints knows exactly which gland and which routing habits caused them, and will have opinions. A manufacturer who only quotes the number from the test report is telling you the report is the extent of their weather experience.
XingLiao manufactures security cameras with the gland, mounting box and cable-entry details specified and documented as part of the assembly, not left to the installer. Buyers can request the sealing specification for any model before ordering.
The short version
The IP number describes the tested assembly, and the weakest link is usually the cable entry, not the housing. Specify the gland, require a drip loop and bottom-entry routing in the manual, and ask the factory what their field failures taught them. Water finds the part nobody wrote down.
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