Short answer: yes. An indoor LoRaWAN gateway runs outdoors inside a sealed stainless box rated NEMA 4X-type / IP66 by the manufacturer, with every antenna carried through the wall on a bulkhead connector — at 868/915 MHz no signal leaves a steel box on its own. Rain needs only the IPX5 jet test, a 6.3 mm nozzle at 12.5 L/min, so you pay for IP67 (1 m under water, 30 min) only where the box can actually be submerged. Plan 2-3 in [50-75 mm] of clearance around the board, then let the heat load set the size: at 35 C ambient an 8 W gateway needs about 0.43 m² of stainless surface to stay under 40 C.
What the box has to beat
Outdoors throws four things at a sealed box, and each maps to a test in IEC 60529:
| Threat | Where it comes from | What the test delivers |
|---|---|---|
| Rain, splashing, wind-driven spray | A wall-mounted box above grade | Digit 5: jets from a 6.3 mm nozzle at 12.5 L/min |
| Hose-down, storm spray | Wash areas, driving storms | Digit 6: 12.5 mm nozzle at 100 L/min |
| Standing or flood water | Grade-level mounting, flood plain, pit | Digit 7: 1 m deep for 30 min |
| Dust and grit | Roads, agriculture, dry sites | First digit 6: dust-tight (5 is dust-protected) |
Two more act over months rather than minutes. Sun heats the shell well above the passing air — an outdoor enclosure running hotter than ambient shows how to count that gain. The day-night temperature swing pushes the trapped air across the dew point, and condensation in a sealed project box shows why the cable entry, not the door gasket, decides whether you get water.
The rating to order
Wall-mount the box with its base at least 12 in [300 mm] above grade and you face rain only. IP65 covers that; its jet test already pushes water harder than rain arrives on a wall. Order the Type 4X / IP66 box anyway, and the same enclosure also takes wash-down hoses and storm spray, whose test is a 12.5 mm nozzle at 100 L/min.
IP66 is a jet rating, not an immersion rating. Where water can stand — grade level, a flood plain, a pit — step up to the submersion types: Type 6 is built for temporary dips, the NEMA type nearest IP67, and Type 6P for prolonged submersion, nearest IP68, which we build to order as a custom enclosure.
In US installations, NEC 110.28 treats an IP code as no replacement for an enclosure type rating, and Table 110.28 lists the types against locations. Write Type 4X / IP66 on the spec, not the IP code alone. The enclosures on this site are rated NEMA 4X-type / IP66 by the manufacturer; they are not UL listed, and NEMA itself tests nothing — the maker rates the design against the published type definitions.
Whatever you pick, the assembly takes the rating of its weakest part. An IP68 box with an IP54 gland is an IP54 box, so order the glands, breathers and bulkhead connectors at the body's level. The full digit meanings sit in the IP rating chart; the outdoor enclosures guide covers the weather side of the same choice.
The material
Order 304 stainless for a general outdoor wall, and 316L wherever chlorides reach the box: sea coast, brine mist, de-icing spray, or wash-down with chloride sanitizers. The molybdenum in 316L raises pitting and crevice resistance; 304 can pit under chloride deposits even at room temperature, so coastal sites default to 316L. Stainless also wraps the board in an EMC shield, one more reason your antennas go through bulkheads. A polycarbonate box would let an antenna radiate from inside, but it sheds heat slightly worse, k = 3.5 W/m²K against 3.7 for stainless, and needs a UV-stable grade — whether an antenna works inside a plastic or steel box carries the numbers for both walls.
Size: fit first, heat decides
The fit rule first. Measure the gateway and add 2-3 in [50-75 mm] on every side — for the mounting hardware, the bulkhead nuts behind the wall, the gland, and your hands at commissioning. A board about 8 x 6 x 2 in [203 x 152 x 51 mm] sets a layout floor of 14 x 12 x 8 in [356 x 305 x 203 mm].
Then heat decides. Take the input power as the heat load: a PoE gateway drawing 8 W turns nearly all of it into heat, because the radio radiates well under 1 W. Most electronics are rated to 40 C ambient unless their datasheet allows more, so hold the air inside at 40 C. Stainless sheds heat at k = 3.7 W/m²K, this site's working figure (5.5 for painted steel, 3.5 for plastic). Design the wall site at 35 C ambient and your allowed rise is 5 C:
- Surface needed: A = P / (k x ΔT) = 8 / (3.7 x 5) = 0.43 m²
- A 16 x 12 x 8 in [406 x 305 x 203 mm] box (H x W x D) has 2 x (0.406 x 0.305 + 0.406 x 0.203 + 0.305 x 0.203) = 0.54 m²
- Rise = 8 / (3.7 x 0.54) = 4.0 C, so inside air sits at 35 + 4 = 39 C, one degree under the limit
In full sun the shell runs hotter than the air around it, so add the solar gain from cooling a dark outdoor enclosure in full sun or fix the box in shade before you trust that 39 C.
Antennas go through the wall
A stainless box is a Faraday cage. At 868 MHz the wavelength is 34.6 cm [13.6 in] — far larger than any seam or gasket gap — so plan on zero LoRa signal through the metal, then pick a route:
- Bulkhead antennas: fit an N-type female bulkhead into a cutout on the top face, O-ring under the flange, and screw the outdoor antenna on outside.
- Polycarbonate wall: where the site allows a plastic box, RF passes with a couple of decibels of loss instead of tens.
Space two antennas at least a quarter wavelength apart — about 3.5 in [90 mm] at 868-915 MHz — and the same distance clear of the metal edge. Any closer and they share one fade, so the second antenna buys you nothing. Keep coax runs short and dressed with a drip loop. For masts and poles, outdoor antenna layout and sealing covers spacing, height and the lightning-side practice.
Cable entry and the condensation fight
The Ethernet enters through the bottom wall in an IP68 gland whose clamp range spans your jacket — outdoor Cat6 runs 6-7 mm [0.24-0.28 in]. Torque the gland nut until the seal grips the jacket all round, then leave a drip loop below the box so water runs off the cable. Sealing an outdoor junction box has the full layout, and the cutouts and glands guide sets the hole sizes.
The air you trap at commissioning is the air the box keeps, so drop a desiccant pack in before closing the door on a humid day. If the site needs pressure equalization, use a membrane breather that carries its own IP66 rating. Never fit an open drain or louver to a Type 4X / IP66 box: you have built a Type 3R, and the rating claim left with the drill.
Grounding and surge
Bond the box to the equipment grounding conductor at a stud inside. NEC 250.96(A) asks enclosures and other metal parts to be bonded so they carry any fault current imposed on them, and under NEC 250.4(A)(5) the earth is no ground-fault path — a conductor does this job, and the four wall bolts do not. Land the lug on bare metal; where the contact sits on coated steel, NEC 250.12 has you strip the coating first.
Surge rides the same two wires your signal does. Land the Cat6 shield at the gland plate, fit a PoE-rated surge arrester inside bonded to the same stud, and bond any antenna mast. If a mains supply shares the box, size its grounding conductor from the overcurrent device ahead of it (NEC Table 250.122), and lock out and verify absence of voltage before you open the door. Enclosure grounding and bonding takes the subject further.
What to put on the order
The enclosure selector turns environment and inside size into a shortlist, and the size finder filters the wall-mount stainless range; when the cutouts matter, custom enclosures take all of them. For the worked example above, the order reads:
| Line | What to specify |
|---|---|
| Body | Wall-mount 304 stainless (316L coastal), 16 x 12 x 8 in [406 x 305 x 203 mm], rated NEMA 4X-type / IP66 by the manufacturer, not UL listed |
| Panel | Removable mounting panel; gateway bolted with 2-3 in [50-75 mm] clearance per side |
| Antennas | Two N-type bulkhead cutouts, top face, minimum 3.5 in [90 mm] apart |
| Cable entry | One M20 gland cutout, bottom face, for 6-7 mm [0.24-0.28 in] outdoor Cat6 |
| Vent | One breather cutout, optional, membrane type rated IP66 |
| Ground | M5 bonding stud inside, tied to the equipment grounding conductor |
| Delivery | Delivered in 10 business days, counted from your approval of the drawing |
The decision by site, one line each. Rain only, wall above grade: a Type 3R custom build carries it, and the 4X / IP66 wall-mount line covers it with hose margin. Wash-down plants: 4X / IP66, 304 for most cleaners and 316L for chloride chemistry. Standing water: Type 6P, built to order. Coastal and brine air: 316L on every one of them.
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 |
|---|---|---|---|
| 14 × 12 × 8 in | 304 stainless | 14 x 12 x 8 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 |
| 10 × 8 × 6 in | 304 stainless | 10 x 8 x 6 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
| 12 × 10 × 6 in | 304 stainless | 12 x 10 x 6 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
Questions
Can I put an indoor LoRaWAN gateway outside in a sealed enclosure?
Yes. Wall-mounted at least 12 in [300 mm] above grade, the box faces rain only, and IPX5 — a 6.3 mm nozzle at 12.5 L/min — already exceeds anything weather delivers to a wall. IP66 adds hose-down at 100 L/min. What turns an indoor unit into an outdoor one is the assembly: bulkhead antennas, an IP68 gland and a bonded box, because the weakest part sets the rating.
Will LoRa pass through a stainless steel enclosure?
For link planning, no. A steel box is a Faraday cage and costs tens of decibels at 868/915 MHz, far beyond a normal LoRa link budget. Carry each antenna on a bulkhead connector and space them at least a quarter wavelength apart, about 3.5 in [90 mm], clear of the metal edge so the box does not detune them.
Do I need IP67 for an outdoor gateway enclosure?
Only if the box can end up under water. IPX7 means 1 m deep for 30 minutes — grade-level mounting, a flood plain or a pit. IP66 is a jet rating, not immersion; for standing water order a Type 6P build, the NEMA type nearest IP68, which we make as a custom enclosure.
What happens to an 8 W gateway at 45 C ambient in the 16 x 12 x 8 in box?
About 49 C inside. The rise through 0.54 m² of stainless is 8 / (3.7 x 0.54) = 4 C, and a sealed box can only sit above the air around it. At 45 C ambient no passive sealed enclosure holds 40 C inside, so shade the wall, move the box, or choose a board rated 55 C or higher.
What size cable gland does outdoor Ethernet need?
An IP68 gland whose clamp range spans the jacket: outdoor Cat6 typically runs 6-7 mm [0.24-0.28 in]. Fit it in the bottom wall, torque the nut until the seal seats, and form a drip loop below so water runs off the cable instead of into the gland.
