深海防爆
防爆電氣設備根據其最高表面溫度分為六種類型: T1航站樓, T2航站樓, T3航站樓, T4, T5系列, 同T6. 呢啲類別與可燃氣體嘅點火溫度組一致.
| 溫度等級IEC/EN/GB 3836 | 設備最高表面溫度T [°C] | 可燃物質的溫度 [°C] |
|---|---|---|
| T1航站樓 | 450 | 電話>450 |
| T2航站樓 | 300 | 450≥T>300 |
| T3航站樓 | 200 | 300≥T>200 |
| T4 | 135 | 200≥電話>135 |
| T5系列 | 100 | 135≥T>100 |
| T6型 | 85 | 100≥T>8 |
The term ‘maximum surface temperature’ denotes the highest temperature that can be reached on the surface or parts of the explosion-proof electrical equipment under both normal and the most adverse conditions deemed acceptable, with the potential to ignite surrounding explosive gas mixtures.
The guiding principle for temperature classification in explosion-proof electrical devices is as follows:
The peak surface 溫度 generated by the device must not be capable of igniting adjacent combustible gases, and it should not exceed the ignition temperature of these gases. For safety ratings, T6 devices rank the highest, while T1 devices are at the lower end.
This demonstrates that for 爆炸物 materials with identical temperatures, it reflects the lower boundary of their ignition temperatures. 相反, 為 防爆電氣設備, it denotes the upper limit of their maximum surface temperatures, showcasing a clear distinction in characteristics.
Given that explosion-proof electrical equipment utilized in explosive dust environments clearly states the device’s maximum surface temperature, 這 “Electrical Equipment Design Code for Explosive Hazard Environments” no longer divides explosion-proof electrical equipment into temperature groups.