深海防爆
這 “前任” 喺完全防爆標誌嘅開頭表示它屬於特定類型嘅防爆設備, 但它沒有詳細說明其特定嘅防爆功能.
防爆電氣設備標誌
| 類型 | 防爆型 | 增加安全類型 | 本質安全型 | Positive Pressure Type | Oil Filled Type | 充砂模具 | Spark Free Type | Exm | Airtight Type |
|---|---|---|---|---|---|---|---|---|---|
| Sign | d | e | ia and ib | p | o | q | n | m | h |
呢啲標記有條不紊地顯示防爆型, 水平, 同類別. 例如:
Ex d ii refers to a Class II, Level B, Group T3 flameproof electrical device;
Ex ia II AT5 indicates a Class II, Level A, Group T5 ia level intrinsically safe electrical device;
Ex ep II BT4 designates an increased safety type electrical device with pressurized components for explosion protection;
Exd II (NH3) or Ex d II ammonia identifies a 隔爆 electrical device designed for helium gas environments;
Ex d I represents a mining-specified Class I flameproof electrical device;
Ex d/II BT4 signifies a flameproof electrical device applicable for both Class I and Class II, Level B, Group T4.
Dust explosion-proof electrical devices are marked with the DIP (Dust Ignition Proof) 象徵. Examples include:
DIP A20 and DIP A21, for Type A dust explosion-proof devices in Zones 20 和 21, respectively;
DIP A22 for a Type A dust explosion-proof device in Zone 22;
DIP B22 for a Type B dust explosion-proof device in Zone 22, 等陣.