| North America Temp. Codes (NEC-500) & CSA | IE / CENELEC / US (NEC 505) T-CODES | Maximum Temperature | |
|---|---|---|---|
| ° C | ° F | ||
| T1 | T1 | 450 | 842 |
| T2 | T2 | 300 | 572 |
| T2A | 280 | 536 | |
| T2B | 260 | 500 | |
| T2C | 230 | 446 | |
| T2D | 215 | 419 | |
| T3 | T3 | 200 | 392 |
| T3A | 180 | 356 | |
| T3B | 165 | 329 | |
| T3C | 160 | 320 | |
| T4 | T4 | 135 | 275 |
| T4A | 120 | 248 | |
| T5 | T5 | 100 | 212 |
| T6 | T6 | 85 | 185 |
| NFPA | C Ignition | F Ignition | Hydrostatic | Zone | |
|---|---|---|---|---|---|
| Class I | Group | Temperature | Temperature | Pressure * | Gas Groups |
| Acetylene | A | 305 | 581 | 6,000 PSI | IIC |
| Hydrogen | B | 520 | 968 | 6,000 PSI | IIC |
| Ethylene | C | 450 | 842 | 1,200 PSI | IIB |
| Gasoline | D | 280 | 536 | 600 PSI | IIA |
* Typical tested hydrostatic pressure required for electrical fittings such as unions, elbows, seals, etc.
| North America Temp. Codes | IE / CENELEC / US | Maximum Temperature | |
|---|---|---|---|
| (NEC-500) & CSA | (NEC 505) T-CODES | ° C | ° F |
| T1 | T1 | 450 | 842 |
| T2 | T2 | 300 | 572 |
| T2A | 280 | 536 | |
| T2B | 260 | 500 | |
| T2C | 230 | 446 | |
| T2D | 215 | 419 | |
| T3 | T3 | 200 | 392 |
| T3A | 180 | 356 | |
| T3B | 165 | 329 | |
| T3C | 160 | 320 | |
| T4 | T4 | 135 | 275 |
| T4A | 120 | 248 | |
| T5 | T5 | 100 | 212 |
| T6 | T6 | 85 | 185 |
| Task Area | Footcandles |
|---|---|
| Paint Booths | 100 – 150 |
| Corridors/Stairways/Restrooms | 10 – 20 |
| Storage Rooms | 10 – 50 |
| Conference Rooms | 20 – 50 |
| General Offices | 50 – 100 |
| Drafting/Accounting | 100 – 200 |
| Areas with VDTs | 75 |
| Classrooms | 50 – 75 |
| Cafeterias | 50 |
| Gymnasiums | 30 – 50 |
| Merchandising | 30 – 150 |
| Manufacturing Assembly | 50 – 500 |
| Parking Areas (uncovered) | 1 – 2 |