日本防爆等级分类

先看d2G4定義: |' C- |: x( _% P, l D2G4是日本系統的安全規格 規格如下

Protection methods:

d = flameproof (same concept as in IEC 60079-1, 1990)1 n! O7 ?- g5 ~. r, @ e = increased safety (same concept as in IEC 60079-7, 1990)

i = intrinsic safety (same concept as in IEC 60079-11, 1991)- z2 B& a& Q4 }1 t o = oil immersion (same concept as in IEC 60079-6, 1968)

p = pressurization (same concept as in IEC 60079-2, 1983)& Q6 ^. |- L2 v/ a\

Note - The protection methods: 'm', 'q', and 'n', have not yet been adopted by the MHLW, and therefore are not available as a certification option through TIIS. Explosion grades (Gas groups in IEC):

1 = propane (same as IIA in IEC)0 N# W4 n3 ]( @; f) @9 h 2 = ethylene (same as IIB in IEC)/ I$ q: j. u, W 3a = hydrogen (same as IIB + H2 in IEC) 3b = carbon disulfide (IIB + CS2 in IEC) 3c = acetylene (IIB + C2H2 in IEC)

3n = all the gases in grade 3 (same as IIC in IEC) 8 [\

Ignition categories (Temperature codes in IEC):

G1 = 450°C (same as T1 in IEC) × 0.8 - 40°C = 320°C rise5 W; z+ C& T9 }3 j# a9 u G2 = 300°C (same as T2 in IEC) × 0.8 - 40°C = 200°C rise\ G3 = 200°C (same as T3 in IEC) × 0.8 - 40°C = 120°C rise. U0 L; @- }. O G4 = 135°C (same as T4 in IEC) × 0.8 - 40°C = 68°C rise G5 = 100°C (same as T5 in IEC) × 0.8 - 40°C = 40°C rise

G6 = 85°C (same as T6 in IEC) × 0.8 - 40°C = 28°C rise 5 B2 e: `9 O% m

以下則是國標定義

dⅡBT44 \\' ^; l9 P5 r+ L. j* _

d代表隔爆型，此项代表爆炸性气体环境电气设备的选型，即在爆炸性气体区域（0区、1区、2区）不同电气设备使用安全级别的划分。如旋转电机选型分为隔爆型（代号d）、正压型（p）、增安型（e）、无火花型（n）；灯具类选型分为隔爆型（代号d）、增安型（e）；信号、报警装置选型分为本质安全型（ia、ib）、隔爆型（代号d）、增安型（e）。 , Z* u4 O; X4 h( O

ⅡB代表气体或蒸气爆炸性混合物等级的划分，分为ⅡA、ⅡB、ⅡC三种，其中ⅡA最低（如通常的烷烃甲烷乙烷；芳香烃苯、甲苯），ⅡB类主要有丙炔、乙烯、环丙烷、1，2-环氧丙烷、焦炉煤气等；ⅡC最高（主要有氢、乙炔、二硫化碳、硝酸乙酯、水煤气等。这些等级的划分主要是依照最大试验安全间隙（MESG）或最小点燃电流（MICR）来区分的。

T4代表135＜T≤200℃，它的定义是指能引燃某种介质的温度分组的划分。主要分为T1——450℃＜T、T2——300＜T≤450℃、T3——200＜T≤300℃、 T4——135＜T≤200℃、

T5——100＜T≤135 、 T6——85＜T≤100℃.

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