Shenhai e fakamoʻoni fakaʻauha
ʻOku fakafaʻahinga ʻa e meʻangaue fakaʻuhila ki he ngaahi faʻahinga ʻe ono ʻo makatuʻunga ʻi he mafana ʻo e ʻea: T1, T2, T3, T4, T5, mo e T6. ʻOku fenapasi ʻa e ngaahi faʻahinga ko ʻeni mo e ngaahi kulupu mafana ignition ki combustible ngaahi kasa.
| Levolo ʻo e ʻea IEC/EN/GB 3836 | Ko e mafana maʻolunga taha ʻo e meʻangaue T [° C] | Lgnition e mafana ʻo e ngaahi meʻa combustible [° C] |
|---|---|---|
| T1 | 450 | T>450 |
| T2 | 300 | 450≥T>300 |
| T3 | 200 | 300≥T>200 |
| T4 | 135 | 200≥T>135 |
| T5 | 100 | 135≥T>100 |
| T6 | 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 mafana ʻo e ʻea 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 fakafepakiʻi materials with identical temperatures, it reflects the lower boundary of their ignition temperatures. ʻI he tafaʻaki ʻe taha, ki he meʻangaue fakaʻuhila ki he fakaʻauha, 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, ʻa e “Electrical Equipment Design Code for Explosive Hazard Environments” no longer divides explosion-proof electrical equipment into temperature groups.