防爆電氣設備嘅防護等級係幾多

設備防護等級 (英超聯賽) 根據潛在故障和預防措施評估特定類型設備嘅防爆可靠性, 作為防爆電氣設備嘅關鍵安全指示器.

呢啲級別被分類為, b, 和c:

1. Level a ensures consistent explosion-proof safety performance under normal operations and during both anticipated and rare faults.

2. Level b guarantees the retention of explosion-proof safety performance during normal operations and foreseeable faults.

3. Level c assures the maintenance of explosion-proof safety performance in both normal operations and specific abnormal situations.

通常, an explosion-proof device is expected to meet Level 3 保護. In certain cases, 然而, Levels 2 或 1 may be permissible for specific explosion-proof types.

Marking methods include:

1. Based on the explosion-proof type symbol:

The combination of the 防爆型 and equipment protection level symbols denotes the protection level. 例如, basic safety devices are marked as ia, IB, 或IC.

2. Based on the equipment type symbol:

Merging the equipment type and protection level symbols indicates the protection level. 例如, I類 (採礦) equipment is marked as Ma or Mb (M representing mine); III類 (廠, 氣) equipment is marked as Ga, 國標, or Ge (G for gas).

It’s crucial to understand that equipment protection levels and explosion-proof levels are distinct concepts often confused in application. The protection level indicates “可靠性,” while the explosion-proof level reflects “可燃氣體 properties and equipment structural features.” 例如, in an industrial setting with a constant hydrogen explosion risk (區 0), required intrinsic safety equipment would be Level ia, Explosion-Proof Level IIC. In a less frequent 氫 risk setting (區 1), Level ib, IIC intrinsic safety equipment would meet the needs, though Level ia, IIC equipment could also be suitable.