Saudi engineers work across two standards universes daily. SEC, NEOM, RSG, MoH = IEC. Aramco, SABIC, Maaden = often NEMA-influenced. A consultant who can't translate between them costs the project weeks of clarification. Here's the cheat sheet.
Four ideas to carry into the next specification conversation you have.
IEC 60364, 61439, 60529, etc. Developed by national committees voting. Adopted as SBC base by KSA. Default for commercial Saudi work.
Often more permissive on sizing, different test methods (NEMA 250 enclosures vs IEC 60529). Aramco's legacy specs incorporate many NEMA conventions.
IP65 ≈ NEMA 4 but not identical. IP66 ≈ NEMA 4X partially. Always check the actual test method, wet location, sandstorm, washdown, not just the badge.
IEC tables (IEC 60364-5-52) and NEC tables (NFPA 70 Table 310.16) give different ampacities for the same conductor. Don't mix tables, pick a system and stay in it for the whole project.
Approximate equivalents. Always verify with the actual test report.
| Topic | IEC | NEMA equivalent |
|---|---|---|
| Enclosure (dust-tight + water jets) | IP65 | NEMA 4 / Type 4 |
| Enclosure (dust-tight + immersion) | IP67/IP68 | NEMA 6 / Type 6 |
| Enclosure (corrosion-resistant) | IP66 + corrosion grade | NEMA 4X / Type 4X |
| Cable conductor (1.5 mm² Cu) | ≈ 16 AWG | AWG |
| Cable conductor (2.5 mm² Cu) | ≈ 14 AWG | AWG |
| Cable conductor (4 mm² Cu) | ≈ 12 AWG | AWG |
| Cable conductor (6 mm² Cu) | ≈ 10 AWG | AWG |
| Cable conductor (10 mm² Cu) | ≈ 8 AWG | AWG |
| Motor protection | IEC 60947-4-1 (Class 10) | NEMA ICS 2 (Class 10/20) |
| Standard voltage (LV) | 400V / 230V (50 Hz) | 480V / 277V (60 Hz) |
Five practical differences that bite Saudi engineers on multi-standard projects.
IP65 (IEC 60529) tests a 6.3 mm-nozzle water jet for 3 min from 3 m distance. NEMA 4 (NEMA 250) tests with a 25.4 mm hose at 200 kPa. The pass criteria look similar; the actual conditions differ. For a Saudi outdoor project with both Aramco and SEC stakeholders, you may need both badges.
An IEC frame motor (IEC 60072) uses metric dimensions (e.g., 132M). A NEMA frame (NEMA MG-1) uses inches (e.g., 215T). They are not interchangeable. Spare motors purchased to the wrong standard don't fit. Always specify which frame.
For 2.5 mm² Cu cable at 30 °C ambient, IEC 60364-5-52 (B2 method) gives ~24 A. NFPA 70 Table 310.16 for #14 AWG gives 20 A at 30 °C. Mixing tables on the same project = cable too small somewhere, too big somewhere else.
Saudi grid: 400V / 230V at 50 Hz. North American grid: 480V / 277V at 60 Hz. Motors, drivers, transformers must match. Importing NEMA-rated equipment to Saudi often requires verifying 50 Hz operation, many North American devices are 60 Hz-only.
SBC pulls from both IEC and select NEMA conventions. NEOM, RSG, and Diriyah Gate spec IEC throughout. Aramco upstream still has NEMA-flavoured specs. Identify your client's parent standard system at kick-off and document it in the project execution plan.
We deliver projects to either standard system, with formal translation documents for clients straddling both, common on industrial cities, refineries, and SABIC sites.
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