An enclosure with no IP code or NEMA type printed on it and no rating in the datasheet is, for specification purposes, unrated. That does not mean it will flood the first time it rains; many unrated boxes with a decent gasket shrug off years of weather. It means nobody tested it, so you cannot write a rating into a spec, and any water damage is your problem, not the supplier's. This page explains what an unrated box actually tells you, how to judge whether it will survive where you plan to mount it, and when to replace it with a rated enclosure.
What a missing rating does and does not tell you
An IP code from IEC 60529, or a NEMA type number from NEMA 250, is a documented result of a standardized test. IP66 means jets of water from a defined nozzle failed to get in. NEMA 4 adds rain, sleet and hose-down, and 4X adds the corrosion resistance of the material or finish. A box with neither has simply not been through those tests. It might pass them. You do not know, and neither does the seller.
That is why weather resistant on a store page means little. It is a marketing adjective, not a rating. The honest rule of thumb: if a published rating is not on the datasheet, the product does not have one you can claim. Note that our enclosures, like most, are rated by the manufacturer and not UL listed; a rating claim is only as good as the manufacturer behind it. A UL listed enclosure has been evaluated by UL to UL 50E, which is a different, third-party level of assurance. We explain the difference in the listing and type-rating guide: UL 50E vs NEMA 250 and what listing means.
What to look for on an unrated box
Since there is no test report, judge the construction. A box that will keep water out outdoors has a visible, continuous gasket in the door or lid, not bare metal-on-metal contact. It has sealed or back-entry cable provisions that can be closed around a cable, and somewhere for condensation or the odd drop of water to leave. Check for these:
- A real gasket, compressible and continuous around the lid or door, glued or retained so it cannot shift.
- A wall plate that sits flat against the mounting surface; a foam backer pad or a bead of sealant behind it closes that gap.
- Cable entries that point down, or can be re-drilled to point down, with a drip loop so water runs off the sheath before it reaches the gland.
- A drain path at the lowest point, or room to drill one.
- A lid that overlaps or shrouds its own fasteners, so water is not driven straight at the screws.
A bare extruded or molded box with no gasket and no weep hole has none of these. Mounted vertically under an eave it may still stay dry. Mounted flat against a wall in the rain, the wall itself becomes a wick and water sits in the mounting cavity. The mounting details matter as much as the box: glands, drip loops and sealant are covered in our guide to sealing an outdoor box, and gland orientation has its own article: mounting cable glands facing up on an outdoor junction box.
How to verify a box before you trust it
If you already own the boxes, test the weakest point instead of guessing. With the lid closed and one cable glanded, spray the seam and the wall interface with a garden hose for a couple of minutes at close range, the way rain-driven wind would hit it, then open it and look. Water at the lid seam means the gasket is missing or the lid is not flat. Water at the wall plate means the back entry or the mounting gap is the leak, which is the common failure on camera boxes with a camera bolted through the front plate.
Also check the lid fastener pattern. Screws that pass through the lid into the body without a gasket under the head are direct water paths. Sealant under each screw head, or a design that keeps screws outside the sealed volume, fixes it. If the box sits where temperatures swing overnight, condensation will form inside even a well-sealed box, so a drain or a breather is not optional. Our article on breather vents and drains covers which one a sealed box needs: breather vent vs drain for a sealed enclosure.
Field survival is not a rating
It is tempting to accept anecdote: dozens of boxes outdoors for years with no failures. Treat that as weak evidence. The same box in a rainier climate, mounted flatter to the wall, with a different cable entry, can behave completely differently. And when a box does leak into a building wall, the damage claim lands on whoever specified it. An unrated box gives you nothing to point to.
The practical compromise for existing installs is to make the box as sealed as you reasonably can and accept the residual risk. Gasket the lid, seal the wall plate leaving a low point open, fit small drain holes at the bottom interior, and route every cable with a drip loop. That is field-tuning an unrated box, not restoring a rating. For new work or anything behind finished walls, the cheaper decision is to spec a rated box from the start and skip the guesswork.
When to re-specify a rated enclosure
Re-specify when any of these apply: the box feeds cable into a building interior; the camera or the box is on an exposed wall or pole; the site has washdown, salt air or dust that exceeds plain rain; or the installation has to pass an inspection where a rating is written into the specification. In the US, NEC 110.28 lists which enclosure types suit which conditions, and IP ratings are not a substitute for enclosure type ratings there, so a NEMA type is what the specification needs.
For outdoor camera and signal wiring, a manufacturer-rated NEMA 4X / IP66 stainless box in a small size covers the case: rain, hose splash and corrosion resistance, with a gasketed lid, a flat back and room for proper glands. Our 6 x 6 x 4 in 304 stainless wall-mount enclosure and its 316L version, the 6 x 6 x 4 in 316L enclosure, are built for exactly this: rated by the manufacturer, not UL listed, with a gasketed door and a removable panel. If the mount needs a bit more depth for connectors, the 8 x 6 x 4 in 304 stainless enclosure is the next step up. We build these to order with your cutouts, delivered in 10 business days, so the glands land where your cable does.
What to put on the order
- Material: 304 stainless for general outdoor duty, 316L near salt, sanitizer or coastal air.
- Size: from the junction box sizes up, with 20 to 30 percent spare depth for glands, loops and connectors.
- Cutouts: specify gland positions on the bottom face, never the top, and give the gland thread sizes so the holes arrive right. If you are unsure what a rating survives once the box is cut and devices are mounted, see what NEMA rating a panel keeps after you cut it and mount devices.
- Orientation: vertical, lid up, hinge side chosen so the door does not shed water into the open box during service. Our hose-down mounting guide covers orientation and drainage: hose-down mounting: drain, sloped top, hinge side.
An unrated box can be made to work, but it can never be made to be rated. When the installation matters, order the box that arrives with the number already on it.
Enclosures for this job
Catalog sizes that suit the job this article answers, picked from its subject; open one for its full specifications.
| Enclosure | Material | Outside H x W x D / display | Rating |
|---|---|---|---|
| 6 × 6 × 4 in | 304 stainless | 6 x 6 x 4 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
| 6 × 6 × 4 in | 316L stainless | 6 x 6 x 4 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
| 8 × 6 × 4 in | 304 stainless | 8 x 6 x 4 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
| 16 × 12 × 8 in | 304 stainless | 16 x 12 x 8 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
Questions
Can I use a box with no IP rating outdoors?
Physically you can, but you are taking the risk yourself. An unrated box has no documented proof of water or dust resistance, so an inspector, insurer or customer can reject it. If the box has a gasket, sealed back entry and drains, it may work in a sheltered spot. For exposed equipment, spec a manufacturer-rated enclosure instead.
Does weather resistant mean the same as waterproof?
No. Weather resistant is a marketing phrase, not a tested rating. Waterproof suggests temporary submersion, which is IP67 territory. A tested rating such as IP66 or NEMA 4X tells you exactly what the enclosure survived in a standardized test. An unrated box only promises whatever its construction suggests.
How do I add a drain to an unrated box?
Drill small holes in the lowest part of the box interior, about 3 to 6 mm (1/8 to 1/4 in) diameter, and deburr them. Fit them so water running down the wall cannot wick straight in, and keep them clear of the equipment. Point glands downward and leave a drip loop in every cable so water runs off the outside.
What rating should a camera junction box have?
For an exposed outdoor camera, spec at least NEMA 4X / IP66, manufacturer-rated and not UL listed unless the project requires a listing. The 4X stainless version also handles washdown and coastal air. The rating must apply to the finished, glanded box: a rating on the empty enclosure does not survive careless cutouts.
Why would a manufacturer leave the rating off?
Testing and certification cost money and time, so a generic box aimed at indoor use often skips them. That does not prove the box leaks; it proves nothing at all. The absence of a published rating means you cannot put a number in your specification or defend the installation in an audit.
