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NEMA vs IP Ratings: How They Compare and Which to Use
Teguar Editorial Team · May 19, 2026
Spec sheets quote enclosure protection two different ways — IP (international) and NEMA (North American) — and buyers often need to compare across them. They overlap heavily but aren't interchangeable: NEMA considers things IP doesn't. This guide maps the two systems and shows which to specify.
If you've ever tried to compare a device rated "IP66" against one rated "NEMA 4X," you've hit the core problem: they measure similar things on different scales, and one includes factors the other ignores. Knowing how they relate lets you compare vendors fairly and specify the right protection.
Key takeaways
- IP (IEC 60529) rates dust and water ingress with two digits; NEMA rates enclosures with types like 4, 4X and 12.
- NEMA additionally considers corrosion, gasket aging, and construction — factors IP does not.
- Rough map: NEMA 12 ≈ IP52/54, NEMA 4 ≈ IP66, NEMA 4X ≈ IP66 + corrosion resistance.
- You can infer IP from NEMA but not perfectly the reverse, because NEMA tests extras IP doesn't.
What each system measures
The international IP system (IEC 60529) is purely about ingress: a first digit for solids/dust (0-6) and a second for water (0-9K). It says nothing about corrosion or gasket durability — only what gets in.
NEMA enclosure types (e.g. 1, 3, 4, 4X, 12) bundle ingress with additional real-world factors: corrosion resistance, protection against icing, gasket aging and overall construction. NEMA 4X, for instance, means hose-down protection plus corrosion resistance — which is why stainless washdown units carry it.
You can translate NEMA to an approximate IP, but not exactly the reverse, because NEMA tests extras. Common approximations: NEMA 12 ≈ IP52/54, NEMA 4 ≈ IP66, NEMA 4X ≈ IP66 with corrosion resistance, NEMA 6 ≈ IP67.
The practical mapping
| NEMA type | Approx. IP | Meaning |
|---|---|---|
| NEMA 12 | IP52 / IP54 | Indoor, dust and dripping liquids |
| NEMA 4 | IP66 | Indoor/outdoor, hose-down, windblown dust |
| NEMA 4X | IP66 + corrosion | NEMA 4 plus corrosion resistance (stainless/washdown) |
| NEMA 6 / 6P | IP67 / IP68 | Occasional or prolonged submersion |
These are approximations, not legal equivalences. If a project mandates a specific NEMA type, don't substitute an IP-only rated product without confirming the extra NEMA factors (especially corrosion) are also met.
Which should you specify?
Follow your region and project: North American industrial and electrical specs usually call out NEMA; international and IT/OT specs use IP. When you need washdown and corrosion resistance, NEMA 4X plus IP69K together is the belt-and-braces choice, which is exactly what sealed stainless steel computers like the TS-7010-22 carry. If a datasheet lists only one system, ask the vendor for the other so you can compare like-for-like.
The bottom line
NEMA and IP describe the same idea — keeping the environment out — but NEMA folds in corrosion and construction that IP ignores, so treat cross-system maps as approximations. Specify to your region and project, and for washdown-plus-corrosion, look for both NEMA 4X and IP69K. See the IP scale in detail in our IP ratings guide.
Frequently asked questions
What is the difference between NEMA and IP ratings?
IP (IEC 60529) rates only dust and water ingress with two digits. NEMA rates enclosures with types (4, 4X, 12, etc.) and additionally considers corrosion resistance, icing and gasket durability — factors IP does not measure.
What IP rating is equivalent to NEMA 4X?
Approximately IP66 plus corrosion resistance. NEMA 4X adds the corrosion protection that a plain IP66 rating doesn't guarantee, which is why it's used for stainless and washdown enclosures.
Can I convert NEMA to IP?
You can approximate IP from a NEMA type (e.g. NEMA 4 ≈ IP66), but not perfectly the reverse, because NEMA tests extra factors like corrosion. Treat conversions as guidance, not legal equivalence.
Should I specify NEMA or IP?
Follow your region and project: North American industrial specs typically use NEMA, while international and IT specs use IP. For washdown with corrosion resistance, specify both NEMA 4X and IP69K.
Does IP account for corrosion?
No. IP only measures ingress of solids and water. Corrosion resistance is a separate consideration, captured by NEMA (e.g. 4X) or by specifying the enclosure material such as 316L stainless steel.