You can cover a scattered cluster of through-wall cable holes with one sealed enclosure and no special product. The box you want is a gasketed wall-mount enclosure with a solid back: mount the back flat over the holes, bring the cables through one rear opening, and let them exit through cable glands on the side or bottom. No terminations live inside; it is purely a cable pass-through and cover.
A few ground rules before you order. A box like this is rated by its manufacturer, not tested by NEMA; ours are rated NEMA 4X / IP66 by the manufacturer and are not UL listed. That rating applies to the enclosure as built. Every hole you add in the field is a chance to lose it, so order the cutouts made at the factory. The cutouts, glands and HMI windows guide covers how to specify openings so the seals hold.
Consolidate the wall holes first
If you already have eight ragged holes, the cheapest fix is to reduce them to one. Pick the most central hole, open it into a single round opening with a hole saw sized for the whole bundle, and fill the rest with sealant. Everything you abandon sits hidden behind the box forever. This one step turns a messy wall into a clean single penetration, and it means the enclosure needs only one rear opening instead of a swiss-cheese back.
For a bundle of eight Cat 6 cables, a 1.5 in (38 mm) rear opening is a practical starting size: it passes the bundle with room to seal around it. Measure your actual bundle diameter and add margin before you commit.
Pick the enclosure
A wall-mount stainless enclosure is the right family here: hinged gasketed door, solid back, and a body that seals against the wall. Size it to cover the hole cluster with at least 1 in (25 mm) of flat wall beyond every old hole, so the sealant bead lands on sound material. Then add room for the bundle to bend and converge toward the exit side. A tight bend on shielded data cable degrades performance; keep bends gentle.
For eight cables and a modest hole spread, a 10 x 8 x 4 in 316L wall-mount enclosure covers a small cluster. If the holes scatter wider, or you want spare glands for future cameras, step up to a 12 x 12 x 6 in 316L wall-mount enclosure. Browse the full range of stainless wall-mount enclosures for other sizes; both 304 and 316L grades are available, and 316L is worth it within a few miles of salt water.
Order the cutouts with the box
This is the step that decides whether the result stays sealed. Three openings do all the work:
- One rear opening over the wall penetration, sized to the bundle with sealing room.
- Side or bottom holes for cable glands, typically one gland per cable for a real seal. The cable gland clamping range guide explains why each gland must match the cable diameter.
- Nothing else. Every unused hole is a future leak.
Use the cutout designer to place these holes on the exact faces you want, check clearances, and send the layout with the order. Custom work is delivered in 10 business days from your approval of the drawing. If your wall layout is unusual, the custom stainless enclosure page walks through what a drawing-based order needs.
Install it
- Open the wall into one penetration at the position you chose, and seal the abandoned holes from outside with sealant. Let it cure.
- Pass the cable bundle through the rear opening and set the box against the wall. Level it, and mark the mounting feet.
- Fasten the box to the wall with anchors suited to the substrate: stainless screws into masonry anchors for brick or concrete, into studs or structural fasteners for siding. At least four points.
- Seal around the rear opening where the bundle passes: a gasketed cable bushing or a sealed gland plate beats a blob of sealant, but a tooled sealant bead around a single opening is acceptable for low-voltage cable.
- Run a continuous bead of exterior-grade sealant around the back edge of the box where it meets the wall, then tool it smooth so water sheds off.
- Route each cable through its gland on the exit side, torque the gland nuts, and confirm each seal grips its cable. Compression-style glands seal better outdoors than set-screw types.
- Close the door and check the door gasket is fully seated all the way around.
Checks when done
Spray the wall above the box with a hose for a minute and open the door: the interior should be dry. Give every gland a gentle tug; none should slide. After the first heavy rain, look again inside and at the sealant bead. If cables run down the wall before entering the trench, form a drip loop below each gland so water drips off the cable, not into it. The article on sealing an outdoor junction box collects these habits in one place.
Mistakes that cost the seal
Field-drilled holes are the big one: a hole saw through a gasketed door or body leaves burrs and a seal surface the gland was never tested on. Order cutouts made at the factory instead. The second is pointing glands upward; read why upward-facing glands leak before you lay out the exit side. The third is skipping the wall seal behind the box: the enclosure can be perfectly dry while the wall rots behind it. Seal the penetration itself, then the box edge.
One related trap: if the box sits where the wall runs with water, like under a dripping eave, follow the advice in sealing a junction box to a brick wall against running water and deal with the water path, not just the box.
Enclosures in this article
| Enclosure | Material | Outside H x W x D / display | Rating |
|---|---|---|---|
| 10 × 8 × 4 in | 316L stainless | 10 x 8 x 4 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
| 12 × 12 × 6 in | 316L stainless | 12 x 12 x 6 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
Questions
What is the box called that covers wall holes and passes cables through?
There is no special product category. The usual answer is a sealed wall-mount enclosure, sometimes called a cable-entry or pull box when it holds no terminations. Any gasketed enclosure with the right cutouts works: one rear opening over the wall holes and side holes for cable glands. Order it with factory cutouts so the seals match the rating.
Does a box with a removable rear cover meet code?
You do not need a removable rear. Use a standard enclosure with a hinged front door, mount the solid back flat against the wall, and work from the front. For low-voltage data cabling, electrical code concerns are minimal, but check with your local authority having jurisdiction. Sealing the wall penetration itself matters more than the box style.
Should the cables exit through the bottom or the side?
Bottom is better when you can route that way, because water runs off the gland bodies instead of pooling at the seal. Side exits work if the glands point slightly downward and each cable has a drip loop. Never point glands straight up; the article on mounting cable glands facing up explains why that leaks.
Can I seal the box to the wall with silicone alone?
Silicone or a compatible polyurethane sealant around the back edge is fine as a water seal on a sound, clean surface. It is not a structural fix. Prime porous masonry first, tool the bead, and inspect it yearly. If the wall cracks or the wall penetration leaks behind the box, reseal the penetrations too, not just the box edge.
