ENGINEERING TOOLS
Converters
The unit and standard conversions you need most, on a single page. Results compute live; mapping tables follow industry standards.
- 8Tools
- 4Categories
- IEC · NEC · ATEXStandards
Cable & Conductor
Convert AWG values from North American datasheets to the metric cross-section (mm²) used on field drawings, with reference ampacity in air.
AWG ↔ mm² Wire Gauge
Length, Thread & Torque
Convert drawing dimensions (mm ↔ inch), pneumatic thread types (NPT / BSP / Metric) and required assembly torque values (Nm ↔ lb·ft) in one place.
Metric ↔ Inch
Torque Nm ↔ lb·ft
NPT ↔ Metric Pipe Thread
| NPT | Metric / BSP | OD (mm) |
|---|---|---|
| 1/8" NPT | M10 × 1 | 10.3 |
| 1/4" NPT | M14 × 1.5 / G 1/4" | 13.7 |
| 3/8" NPT | M18 × 1.5 / G 3/8" | 17.1 |
| 1/2" NPT | M22 × 1.5 / G 1/2" | 21.3 |
| 3/4" NPT | M27 × 2 / G 3/4" | 26.7 |
| 1" NPT | M33 × 2 / G 1" | 33.4 |
NPT (tapered) and BSP/Metric (parallel or tapered) follow different standards; there are no direct equivalents — common pairings are shown.
Enclosure Ratings & Ex Certifications
Verify IP ↔ NEMA enclosure ratings for panel/field equipment and ATEX ↔ NEC/CEC hazardous area mappings for explosive atmospheres — an area where the wrong choice is a direct life-safety risk.
IP ↔ NEMA Enclosure Rating
| IP (IEC 60529) | NEMA 250 | Description |
|---|---|---|
| IP20 | 1 | Indoor, protected against contact |
| IP54 | 3R / 12 | Dust-protected, splash-resistant |
| IP55 | 3 | Outdoor, water-jet resistant |
| IP65 | 4 | Dust-tight, water-jet resistant |
| IP66 | 4X | Dust-tight, corrosion-resistant |
| IP67 | 6 | Temporary submersion |
| IP68 | 6P | Continuous submersion |
IP and NEMA do not map one-to-one: NEMA includes additional criteria (corrosion, ice, oil). Values shown are approximate equivalents per IEC and NEMA guidance.
ATEX ↔ NEC/CEC (Hazardous Area)
REFERENCE| ATEX (IEC 60079) | Zone | NEC 500 / CEC | Description |
|---|---|---|---|
| II 1G | Zone 0 | Class I, Div 1 (Group A–D) | Explosive gas/vapor continuously present |
| II 2G | Zone 1 | Class I, Div 1 (Group A–D) | Gas/vapor likely in normal operation |
| II 3G | Zone 2 | Class I, Div 2 (Group A–D) | Gas/vapor only in fault conditions |
| II 1D | Zone 20 | Class II, Div 1 (Group E–G) | Combustible dust cloud continuously present |
| II 2D | Zone 21 | Class II, Div 1 (Group E–G) | Dust cloud likely in normal operation |
| II 3D | Zone 22 | Class II, Div 2 (Group E–G) | Dust cloud only in fault conditions |
| — | — | Class III, Div 1/2 | Ignitable fibers/flyings (NEC-specific) |
Temperature Class (T-Code) — ATEX & NEC Side-by-Side
°C · °F| IEC / ATEX | NEC | Max °C | Max °F | Note |
|---|---|---|---|---|
| T1 | T1 | 450 °C | 842 °F | |
| T2 | T2 | 300 °C | 572 °F | |
| — | T2A | 280 °C | 536 °F | NEC sub-class |
| — | T2B | 260 °C | 500 °F | NEC sub-class |
| — | T2C | 230 °C | 446 °F | NEC sub-class |
| — | T2D | 215 °C | 419 °F | NEC sub-class |
| T3 | T3 | 200 °C | 392 °F | |
| — | T3A | 180 °C | 356 °F | NEC sub-class |
| — | T3B | 165 °C | 329 °F | NEC sub-class |
| — | T3C | 160 °C | 320 °F | NEC sub-class |
| T4 | T4 | 135 °C | 275 °F | |
| — | T4A | 120 °C | 248 °F | NEC sub-class |
| T5 | T5 | 100 °C | 212 °F | |
| T6 | T6 | 85 °C | 185 °F |
T-Code classifies the maximum surface temperature of the equipment; it must stay below the auto-ignition temperature of the surrounding gas/vapor. ATEX/IECEx uses only T1–T6, while NEC 500 adds intermediate sub-classes (T2A–T2D, T3A–T3C, T4A).
Temperature & Pressure
Quickly convert field instrument readings between metric (°C, bar) and imperial (°F, psi) units — for datasheet checks and commissioning.
Temperature °C ↔ °F
Pressure bar ↔ psi
Note: These tools are for reference only. For critical design decisions, refer to the relevant standard (NEC, IEC, ANSI/NEMA) and the manufacturer's original datasheet.