Short answer: no sticker of its own. A cabinet built into your machine is not a product you sell separately, so it carries no UL file and no IP label of its own. The machine, or the control panel housed in it, is the evaluated product. In North America that means a listed panel build, with the enclosure Type number on the nameplate under NEC 409.110, or an NRTL field evaluation of the installed machine. In Europe you declare the IP code yourself: IP66 is the washdown value, and the IEC 60529 test evidence stays in your file. A standalone box is the exception, because it sells as a product — ours are rated NEMA 4X / IP66 by the manufacturer; not UL listed. Put the Type on the drawing and each market's paperwork follows from it.
Which product gets the evaluation
Compliance attaches to a product, so name the product your cabinet belongs to. A catalog enclosure is its own product. The maker declares its NEMA Type under NEMA 250, an ANSI standard written for exactly this self-declaration; an IP code under IEC 60529 can sit beside it. A third-party listing to UL 50E is available on top, and our guide to UL 50E, NEMA 250 and listing separates what each layer adds. An industrial control panel is a different product. NEC 409.2 defines it as two or more power circuit components, control circuit components, or both, and UL 508A is the standard for listing one. The enclosure goes into that evaluation as a component. A machine with the cabinet welded into the frame is the third case: the machine is the product, and the enclosure rides inside its approval.
| What you sell | Product that gets evaluated | Marking the inspector sees |
|---|---|---|
| A catalog enclosure | The enclosure itself | Type number, IP code; UL 50E mark when listed |
| A panel you build for a customer | The industrial control panel (listed to UL 508A) | The shop's mark plus the Type number on the nameplate (NEC 409.110) |
| A machine with the cabinet built in | The machine | The CE mark on the machine, or a field-evaluation label at the site |
US workplaces put one rule around all three rows. OSHA 29 CFR 1910.303(a) requires electrical equipment to be approved. 1910.399 counts equipment as acceptable when it is listed, labeled or otherwise determined to be safe by a nationally recognized testing laboratory. That last phrase is the door a one-off machine walks through.
What Type and IP ratings actually test
NEMA 250 works by self-declaration: you build to the standard and state the Type. Its tests reach past water. Type 4X carries corrosion work — 200 hours of salt spray, judged against an AISI 304 stainless test specimen under NEMA 250's Table 5-1D. A UL listed enclosure is the same idea with a third party behind it: UL has evaluated that design to UL 50E.
IEC 60529 grades ingress only, digit by digit. First digit 6 means dust-tight. Water digit 6 means powerful jets: a 12.5 mm nozzle at 100 L/min, played over the cabinet from 2.5 to 3 m for at least 3 min. That is at least 300 L of water against the enclosure (100 L/min x 3 min). Water digit 7 is temporary immersion, 1 m deep for 30 min. No digit tests corrosion, UV or impact, so an IP code on its own says nothing about how walls age in a dairy. The IP rating chart tabulates every digit, and the NEMA enclosure types guide carries the Type definitions side by side.
NEC 110.28 settles the pairing for US installations: IP ratings are not a substitute for enclosure Type ratings, and its Table 110.28 lists which Type fits which location. The working habit is simple. Write the Type for North America and the IP code for the EU file, both from the same drawing.
What the inspector reads on a built-in cabinet
A panel built by a listed shop carries the shop's certification mark and a nameplate. NEC 409.110 requires the enclosure type number on the panel, and the listing standard folds that into its own marking list, which reaches further than the NEC minimums. For a washdown machine the line reads Type 4X, and that Type is what the inspector works from. How much of an enclosure's own rating survives inside a certified assembly is mapped in what carries over from an enclosure certificate to a certified assembly.
An in-house panel has no shop mark, so approval has to come from somewhere else. OSHA 1910.303(a) still requires approved equipment, and the working answer for a one-off machine is an NRTL field evaluation after installation. The field engineer reads the machine as found: bonding across the cabinet and its door, conductor protection, gasket condition, component markings, and the space around the equipment. NEC 110.26(A) asks for 3 ft [900 mm] of clear depth in front for 0 to 150 V to ground in Condition 1, and more at higher voltage (Table 110.26(A)(1)). The door also needs to swing a full 90 degrees. Whether an in-house control panel needs a UL label sorts the label question before the visit.
Field evaluation: what it covers, what it does not
Will a custom cabinet pass a field evaluation? Yes — that is what the program exists for. A field evaluation is site-specific: an NRTL engineer examines the installed product, and the result supports approval of the installation with the authority that raised the question.
The label attaches to the evaluated unit at that site. Machine two on a new line takes a listed panel build or a fresh evaluation; the paper does not travel with the design. A field label is also not a Type rating: it carries no IP code and no corrosion result. The cabinet still needs its declared environment rating on the drawing and the nameplate. Buyers read marks with the same suspicion you would, whether the product is a machine tool or a cabinet: judging a machine listing before you buy lists the questions that separate a real mark from a bare claim.
One machine, two markets: the numbers
Say you build a case packer with the cabinet welded into the frame: 36 x 30 x 12 in [900 x 750 x 300 mm], 304 stainless, continuous door gasket. One machine ships to a US dairy, its twin to a Dutch customer. The panel inside holds a 480 V feed, a 10 hp drive, a 24 V DC power supply and a PLC. Two or more power or control circuit components makes it an industrial control panel under NEC 409.2.
North American machine: a listed panel shop builds and marks it. The nameplate carries the shop's mark, the supply voltage and Type 4X as the enclosure type number under NEC 409.110. The dairy's inspector reads Type 4X and signs off on the environment; no IP sticker appears anywhere in the job file.
European machine: same cabinet, and you declare IP66 in the CE file. The evidence is the jet test described above: at least 300 L of water played over the cabinet over the full 3 min. Keep the build matched to the claim: a rated gland on every entry and every field-cut hole sealed. One open 12 mm hole drops the whole cabinet to that hole's rating. Field-cut entries can keep the rating when gasketed: field-drilled conduit entries that keep a Type 4X rating sets out the method. Once the gear is mounted, what a panel keeps after you cut it and mount devices tracks the rest.
Corrosion sits outside the EU declaration, because IEC 60529 never tests it. The defense there is the material itself — 316L where chlorides ride the washdown water. The 200-hour salt-spray result belongs to Type 4X and appears only on the North American side of the job.
What goes on the drawing and the order
- The Type, written on the drawing: Type 4X for washdown, Type 12 for a dry indoor cabinet, Type 6P where submersion is part of the cycle.
- The IP code beside it for the EU file: IP66 for the washdown machine above.
- Material by environment: 304 stainless for most washdown plants, 316L for salt air, brine or chloride-bearing spray.
- Every opening closed by a rated part: gasketed glands, a rated window kit, plugged spares — the weakest part sets the rating of the whole assembly.
- The compliance path in the job file: listed panel build, field evaluation after install, or CE self-declaration.
Our custom work takes your material, width, height, depth and every cutout and builds them as one piece, delivered in 10 business days from your approval of the drawing. The rating on that drawing is ours as the manufacturer, for the design you specified, and it is not UL listed. When a job demands a listed enclosure, the gap closes with a listed panel build or the unlisted-enclosure path for a listed control panel. Order the cabinet from custom enclosures and lay out the openings with the custom stainless cutout page. Then the Type you need is on the drawing before fabrication starts.
Catalog dimensions to compare
Compare these catalog dimensions with your component layout. Open each enclosure for its rating, material and usable space, then check those specifications against your application.
| Enclosure | Material | Outside H x W x D / display | Rating |
|---|---|---|---|
| 36 × 30 × 12 in | 304 stainless | 36 x 30 x 12 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
| 60 × 36 × 16 in | 304 stainless | 60 x 36 x 16 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
| 48 × 36 × 16 in | 304 stainless | 48 x 36 x 16 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
| 60 × 36 × 12 in | 304 stainless | 60 x 36 x 12 in | Rated NEMA 4X / IP66 by the manufacturer; not UL listed |
Questions
Does a custom enclosure welded into a machine need its own UL listing?
No. The machine, or the listed industrial control panel inside it, is the evaluated product. The panel listing covers the enclosure as a component and carries the enclosure Type number on the nameplate under NEC 409.110. Without a panel listing, OSHA 1910.303(a) still calls for approved equipment, and 1910.399 accepts what an NRTL has determined safe — exactly what a field evaluation delivers.
Do I need an IP sticker on a CE-marked machine?
You need the declaration and the file behind it; the sticker question disappears. Declare IP66 for a washdown machine and keep the IEC 60529 basis on record: powerful jets from a 12.5 mm nozzle at 100 L/min, from 2.5 to 3 m, for at least 3 min. CE marking is your self-declaration, so the built cabinet has to survive the code you wrote.
What rating belongs on the drawing for a washdown cabinet?
Type 4X for the North American build and IP66 beside it for the EU file. They are not the same test: Type 4X adds 200 hours of salt spray against a 304 stainless specimen, while IP66 proves only ingress under jets. NEC 110.28 states that an IP code cannot replace the enclosure Type in US installations, so the Type number is what the nameplate carries.
Will a UL field evaluation cover the next machine on the line?
The field label attaches to the evaluated unit at that site, so the next serial number takes a listed panel build or a fresh evaluation. The visit goes best against a finished install: bonding complete, gaskets seated, nameplates marked, and 3 ft [900 mm] of clear working depth in front of the equipment. Expect the engineer to read the cabinet against the rating you declared.
Are your custom enclosures sold as UL listed boxes?
No. We rate them to the NEMA Type on your drawing — Types 1, 3R, 4, 4X, 6P, 12 and 13 — as the manufacturer, and they are not UL listed. Hazardous-location Types 7 and 9 are not offered. Where a job demands a listed enclosure, the gap closes with a listed panel build or an NRTL field evaluation of the finished machine.
