Short answer: order one custom enclosure with every 1/16 DIN cutout machined at the factory. Twelve controllers fit a 20 x 16 x 8 in [508 x 406 x 203 mm] stainless box in two rows of six on a 70 mm [2.75 in] pitch, delivered in 10 business days counted from your approval of the drawing. Nobody catalogs a twelve-hole 1/16 DIN box, and the punch-and-jigsaw route costs you a day and usually the seal. The layout is arithmetic, not art: a 45 mm [1.77 in] square opening, 25 mm [1 in] between holes, 8 in of depth for the bodies. Here are the numbers, the layout, and what to send for a quote.
What size enclosure do 8 to 12 1/16 DIN controllers need?
A 20 x 16 x 8 in [508 x 406 x 203 mm] enclosure holds twelve controllers in two rows of six with 25 mm [1 in] gaps, wiring gutters top and bottom, and a 24 V supply on the backplate; ten controllers fit a 16 x 12 x 8 in [406 x 305 x 203 mm] box.
Work from the pattern outward:
| Controllers | Layout | Pattern width | Working enclosure |
|---|---|---|---|
| 8 | 2 rows of 4 | 4 x 45 + 3 x 25 = 255 mm [10.0 in] | 16 x 12 x 8 in |
| 10 | 2 rows of 5 | 5 x 45 + 4 x 25 = 325 mm [12.8 in] | 16 x 12 x 8 in |
| 12 | 2 rows of 6 | 6 x 45 + 5 x 25 = 395 mm [15.6 in] | 20 x 16 x 8 in |
Six openings plus five gaps take 395 mm of the door, and a 20 in [508 mm] door gives you about 480 mm of flat plate, so the block sits with 42 mm [1.7 in] to spare at each edge. Height is easier: two rows take 2 x 45 + 25 = 115 mm [4.5 in], leaving over 250 mm of a 16 in [406 mm] door for gutters and labels.
Material follows the room. Indoor panels in 304 stainless take the wiping and splash of a control room for years. A washdown line wants 316L and the Type 4X / IP66 build, rated by the manufacturer and not UL listed. Before you settle the size, read the enclosure sizing guide for working space and door clearance, and the multi-meter layout for the same grid logic on energy meters.
What is the 1/16 DIN panel cutout size?
Plan a 45 x 45 mm [1.77 x 1.77 in] square opening with a +0.6 mm [0.024 in] tolerance, under a 48 x 48 mm [1.89 x 1.89 in] bezel, then read the exact square, thickness band and depth off the installation sheet for the model you ordered.
The tolerance runs one way. At +0.6 mm the bezel gasket still compresses onto the plate and the clamp still grips; past it the gasket misses and the body rattles in the hole. Undersize simply stops the body, which is why a die that matches the model is safe.
The class does not pin the depth either. One dual-output 1/16 DIN PID unit lists a 48 x 48 mm panel opening and a 3.31 in [84 mm] body, while relay-heavy units run to 110 mm [4.3 in]. The same sheet prints the panel thickness band the clamp grips, so match your plate to it before the drawing goes out. For hole fundamentals across the whole panel, read the cutouts, glands and windows guide.
How far apart do you space the cutouts?
25 mm [1 in] of flat plate between openings, a 70 mm [2.75 in] pitch center to center, seats the mounting clamps, keeps one bezel gasket off the next, and leaves room for label strips.
The clamp on a 1/16 DIN body pushes on from behind and needs a thumb or a small driver beside the housing, and 25 mm gives you that. Double the gap to 50 mm [2 in] between rows when each row feeds from its own gutter, so the upper loom clears the lower bodies. Keep every opening at least 25 mm from a bend, a gasket line or the door edge. The front-panel layout for crowded controls works the same edge rules when you add pushbuttons and pilot lights.
How deep does the enclosure need to be?
8 in [203 mm] of depth covers the deepest common bodies: the door and frame take about 25 mm [1 in], the body 110 mm [4.3 in], and you keep roughly 65 mm [2.6 in] for terminals and the wire bend.
A compact 84 mm body leaves you 90 mm [3.5 in] and more behind it, enough for a shallow DIN rail row on the backplate. Leave a 100 mm [4 in] service loop on every controller so a body pulls forward out of the front without dragging its neighbors.
Depth stops being about controllers the moment you land a feed in the same box. A 100 A disconnect fed in 2 AWG copper, rated 115 A at 75 C, needs 2.5 in [64 mm] of wire bending space at the terminal under NEC 312.6, Table 312.6(A). NEC 312.8 also caps how much of a cabinet holding overcurrent devices you may fill with conductors. That panel wants the 10 in [254 mm] deep box.
How do you lay out the pattern and order it?
Lay the grid out in seven steps and send it as a drawing: two rows of six at a 70 mm [2.75 in] pitch, one datum, two blanked spares, and every opening tagged with its controller model.
You need the installation sheet for each exact model, your panel schedule, and a layout tool. Then:
- List one line per position: model, cutout with its tolerance, body depth, clamp type, terminal type.
- Fix the grid, rows of six at a 70 mm pitch, and center the block on the door.
- Run the arithmetic: width 6 x 45 + 5 x 25 = 395 mm [15.6 in]; height 2 x 45 + 25 = 115 mm [4.5 in].
- Dimension every opening from one datum, the left bent edge of the door. Chained hole-to-hole dimensions drift by the tolerance times the number of holes.
- Draw the rear view: bodies at their depth, gutters, the 24 V supply, and a 100 mm [4 in] loop per controller.
- Add two spare openings in the bottom row and blank them with snap-in plates rated IP65.
- Lay it out in the cutout designer, or the enclosure builder for the whole box, and send it for a quote. Your 10 business days start when you approve the drawing that comes back.
Will twelve controllers overheat in a sealed box?
Not at typical dissipation: 12 controllers at 2 W each plus a 24 V supply losing about 4 W is 28 W, and a 20 x 16 x 8 in stainless box sheds 28 W for a 9.7 K rise, which puts the inside near 45 C [113 F] at 35 C [95 F] ambient.
The arithmetic, shown:
- Controllers: 12 x 2 W = 24 W. A supply feeding that load at 85 % efficiency loses about 4 W. Total 28 W.
- Box surface: 2 x (0.508 x 0.406) + 2 x (0.508 x 0.203) + 2 x (0.406 x 0.203) = 0.78 m² [8.4 sq ft].
- Stainless walls pass about k = 3.7 W/m²K, the value our sizing guide uses. Rise = 28 / (3.7 x 0.78) = 9.7 K.
Most 1/16 DIN controllers carry a 0 to 50 C ambient rating on their datasheets, so 45 C inside leaves you 5 K of margin. Hold anything rated only 40 C, the default for electronics without a hotter datasheet, to a stricter budget: at 35 C ambient this box holds a 5 K rise with about 14 W inside, and at 30 C [86 F] ambient with 29 W. Your 28 W example sits at 40 C on the line at 30 C ambient, so at 35 C ambient either use 50 C-rated gear inside or move the supply out of the box. Controllers also dump some heat into the plate through their bezels; treat that as margin, not budget.
Should you cut the holes yourself or have the factory cut them?
Have the factory cut them: twelve squares at a +0.6 mm tolerance, deburred, with the finish intact, arriving ready for your clamps; a hand-punched or jigsawed plate costs you half a day of filing and still leaks at the gasket.
| Route | Tooling | Result |
|---|---|---|
| Factory-machined front plate | Punch or mill set to your drawing | Clean squares, tolerance held, rating kept |
| Panel-shop punch | Square die matched to your model's opening | Clean holes, one die per cutout size |
| Jigsaw and file at the bench | Jigsaw, files, tape | Oversize edges, wavy corners, finish burned at each cut |
The jigsaw is the route to pass up on a stainless door: the stroke walks, corners crack the finish, and an oversize edge is exactly where water gets past a bezel gasket. A panel shop with the right square die does clean work when you already own the enclosure. For repeat panels, factory cutouts for repeat work beats re-fixturing every batch, and the trade between the two routes is laid out in factory versus shop machining.
What should the cutout drawing specify?
One datum, one line per opening, and the controller model against every hole: cutout with its +0.6 mm tolerance, body depth, clamp type, terminal type, and which openings get IP65 blanking plates instead of a controller.
Put on the sheet:
- Plate: material, finish and thickness, inside the clamp's band from the installation sheet.
- Grid: pitch, edge margins from the datum, pattern centered.
- Rear: body depths, 25 mm [1 in] of clear space behind the deepest body, gutter and loop sizes.
- Spares: position and blanking plate.
- Model per hole, so the 84 mm [3.31 in] unit lands where you drew it, not where the 110 mm body goes.
The full contents list for a quote-ready drawing is in the custom enclosure drawing package.
How do you check the finished panel, and what costs the rating?
Measure the first and last opening of each row from the datum, positions within ±0.5 mm [0.02 in] of the drawing, then seat every controller without force, clamp it, and swing the door through its full travel with the wires loomed.
Checks that prove the build:
- Caliper the datum-to-opening dimension on the two end holes of each row; ±0.5 mm is the pass line.
- Seat each body by hand: the clamp should need a firm push, and the bezel gasket should show an even ring of compression.
- Swing the door fully; NEC 110.26(A) wants at least a 90 degree opening where you service the panel, and the loom should not pull on a terminal.
- Run the panel two hours at load and read the inside air: under 50 C for 50 C-rated controllers, under 40 C if anything inside carries the 40 C rating.
Three mistakes cost the rating. Oversize holes, past the +0.6 mm limit, leave the gasket with nothing to press; the fix is a new plate, not sealant. A hole cut in the field after delivery is the weak link on the face, so cut your spares at order time and blank them. And a lower-rated part drags the assembly down: two IP65 blanks on a Type 4X / IP66 box put the front face at IP65, the worst part on it. The rating a panel keeps after you mount devices covers that weakest-link rule across the whole assembly.
Order the 20 x 16 x 8 in 304 box for twelve indoor controllers, the 16 x 12 x 8 for ten, 316L with the Type 4X / IP66 build for the washdown line, and every hole, controller or spare, cut at the factory.
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 |
|---|---|---|---|
| 20 × 16 × 8 in | 304 stainless | 20 x 16 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 |
| 12 × 10 × 6 in | 304 stainless | 12 x 10 x 6 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
| 16 × 14 × 8 in | 304 stainless | 16 x 14 x 8 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
Questions
How many 1/16 DIN controllers fit a 16 x 12 x 8 in enclosure?
Ten, in two rows of five: 5 x 45 mm plus 4 x 25 mm is 325 mm of pattern on roughly 380 mm of flat door, which leaves 27 mm at each edge. Twelve needs 395 mm of pattern, so step up to the 20 in [508 mm] wide enclosure.
Can you mix 1/16 DIN and 1/8 DIN controllers on one plate?
Yes, because both use openings 45 mm tall, so they share one row grid. A horizontal 1/8 DIN unit needs about 92 x 45 mm [3.62 x 1.77 in] instead of 45 x 45 mm on the usual installation sheets, with the same 25 mm side gaps. Tag every opening on the drawing with its own controller model.
Do spare cutouts weaken the enclosure rating?
Not when you blank them at order time: a snap-in plate rated IP65 seats in the same machined hole a controller would. The front face of a Type 4X / IP66 box assembled with IP65 controller gaskets and IP65 blanks sits at IP65, the worst part on the face. A hole cut in the field after delivery is the weak link.
How do you replace one controller without rewiring the row?
Release the side clamps and the body slides out through the front, leaving the opening intact. Order models with plug-in terminal blocks and leave a 100 mm [4 in] service loop per controller, and you swap a unit in minutes without touching a screw or its neighbors.
