LeMotech Junction Box, Electrical Box IP65 Water Resistant Dustproof ABS Plastic Project Enclosure for Electronics White, External Size 3.9 x 3.9 x 2.8 inch

Why I reached for this box

I picked up the LeMotech junction box (3.9 x 3.9 x 2.8 in) to clean up a small outdoor POE camera install and hide the excess cable. I needed something compact, genuinely weather-resistant, easy to work with, and not an eyesore on a white soffit. After living with it, drilling it, and mounting it, I came away impressed by the value and the practicality—with a few caveats around cable glands and long-term UV exposure that are worth noting.

Build quality and weatherproofing

The enclosure is ABS plastic with an IP65 rating, and it feels solid for its size. The lid mates into a molded seal that compresses evenly when the stainless steel corner screws are snugged down. I tested the box under a sustained hose spray from different angles (not submersion) and didn’t see any ingress. Dust sealing has also been excellent; interior terminals and splices stayed clean during a couple of windy weeks while I iterated on the install.

ABS isn’t bulletproof in full sun over many seasons, but for shaded or partially sheltered locations it’s a good balance of weight, durability, and price. The white finish blends neatly against painted trim and doesn’t telegraph “industrial” the way gray utility boxes can.

A couple of small but welcome touches:
- Stainless lid screws don’t strip easily and thread smoothly into the inserts.
- The included rubber stoppers plug unused penetrations tightly.
- The inside surfaces cut cleanly without chipping when drilled at the right speed.

If you need something for high-UV, south-facing exposure, I’d still favor polycarbonate or fiberglass-reinforced enclosures. For under-eave, porch, garage, or fence-mounted applications, this ABS box is perfectly adequate.

Size and internal layout

External dimensions are 3.9 x 3.9 x 2.8 in; the usable internal space is about 3 x 3 x 2.08 in. That’s just enough for:
- A small terminal strip and a couple of wire nuts, or
- A compact DC buck converter, or
- RJ45 coupler and slack management for a camera.

It’s not large enough for bulky wall warts or deep receptacles, but it’s a great size to tidy up connections and hide service loops. If you’re planning to mount devices inside, check the thickness and footprint carefully—space is tight once you add glands and bend radii for stiffer cables.

Installation experience

Mounting is straightforward. The kit includes:
- 2 x NPT 1/2-inch cable glands
- 2 x rubber sealing plugs
- 4 x stainless steel lid screws
- 4 x self-tapping screws and 4 x expansion anchors for surface mounting

I mounted the box under a soffit using the provided hardware; it held tight and sealed well. The back wall feels sufficiently stiff for surface mounting without distortion when you tighten the fasteners.

Drilling is where this enclosure shines. ABS drills cleanly if you go slow and use sharp bits. For larger penetrations I used a step bit and a hole saw, keeping the speed low to avoid melting. Edges were clean, and the threads on the cable glands bit nicely.

A note on knockouts: some units/variants have light mold marks indicating where to open holes. Treat those as guides rather than true knockouts. The included 1/2-inch NPT glands require a specific hole size (check your gland’s datasheet; typically around 22 mm/7⁄8 inch). If you fully punch out a larger “knockout” outline, you may end up with a hole that’s too big for the supplied glands. Drilling to the proper size yields a snug, watertight fit.

Cable glands and the RJ45 reality check

The supplied glands are serviceable for typical round cables. For my POE setup, an RJ45 plug would not pass through the cap without modification. That’s normal for many 1/2-inch glands; they’re sized for cable diameter, not for pre-terminated connectors.

You have a few options:
- Terminate the RJ45 inside the box. Pull the bare cable through the gland, crimp your connector inside, and keep the gland’s seal intact.
- Use a larger, RJ45-friendly pass-through gland designed for pre-terminated Ethernet (often labeled for CAT5e/CAT6 with removable inserts).
- Enlarge the cap opening carefully with a step bit. This works, but if you oversize it, the compression seal may not grip the cable tightly, which compromises water resistance.

For low-exposure locations, enlarging the cap can be acceptable. For true outdoor installs, I’d recommend proper pass-through glands or terminating inside.

In use: sealing, strain relief, and serviceability

Once buttoned up, the lid compresses the gasket evenly and the box stays square—no warping or uneven gaps. The threaded glands provide adequate strain relief for moderate cable loads. If you expect frequent service, the four corner screws make access easy without stripping, and the gasket hasn’t stretched after a few open/close cycles.

I ran a quick condensation test by moving the box from a cool garage to a warm, humid exterior. No visible moisture formed inside; the ABS wall thickness seems to help buffer rapid temperature swings.

Compliance and safety

The enclosure is listed as IP65 and compliant with CE and RoHS. It’s suitable for low-voltage DC and general junction work. If you’re running mains voltage, use proper bushings, maintain conductor separation, and observe local code. The small interior volume leaves limited room for large wire bends or splices—plan your layout and strain relief carefully.

Where it fits—and where it doesn’t

Best fits:
- Outdoor camera junctions and slack management
- Low-voltage lighting and sensor hubs
- Small DC converter or distribution nodes
- Clean, discrete surface-mount enclosures on light-colored trim

Think twice if:
- You need to pass pre-terminated RJ45 connectors through stock glands
- The box will live in intense, full-sun locations year-round
- You require space for bulky modules or multiple large splices

Tips for a clean install

• Drill slow. Use a sharp step bit or holesaw and let the tool cut—don’t melt the ABS.
• Measure your glands. Match drill size to the gland, not to any molded knockout outlines.
• Plan RJ45 strategy. Either crimp inside the box or use a purpose-built pass-through gland.
• Mind the seal. Keep chips out of the gasket channel and don’t overtighten lid screws.
• Shade helps. If mounting in sun, consider a UV-resistant topcoat or choose polycarbonate.

Durability and long-term notes

After a stretch outdoors under a soffit, the enclosure shows no warping, no leaks, and no chalking. That said, ABS can discolor and embrittle with prolonged UV exposure. If your installation can’t avoid direct sun, you’ll extend the life of the box with:
- A UV-stable paint or clear coat
- A small shade or positioning under eaves
- Selecting a polycarbonate alternative for extreme exposures

The gasket has remained supple; keep it clean and lightly compressed when stored to preserve elasticity.

The bottom line

The LeMotech junction box hits a sweet spot for small outdoor electronics and cable management: compact, easy to work with, and genuinely weather-resistant when installed correctly. The included hardware is thoughtful, the seal is reliable, and the ABS is forgiving to drill and cut. The main limitations are typical of boxes this size—tight interior space, standard glands that aren’t ideal for pre-terminated Ethernet, and ABS’s medium-term UV resilience.

Recommendation: I recommend this box for low-voltage and light-duty mains junctions in shaded or partially sheltered outdoor locations, especially when you value a neat, compact footprint and quick, clean modifications. Pair it with the right cable glands (or terminate inside) and mount it out of direct, harsh sun, and it will serve you well. If your project demands frequent RJ45 pass-throughs or lives in full UV exposure, consider upgrading the glands and, if necessary, stepping up to a polycarbonate enclosure.