Zone 21 - Siemens SIMOTICS SD Operating Instructions Manual

8.5.6

Zone 21

158
① ②
① ②
①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩
⑪
⑫
Low-voltage motors
Operating Instructions, 05/2014, 5 610 00000 02 000
II 2
③ ④ ⑤
Ex
③ ⑦
CE - or EAC marking
Identification number or name of nominated testing agency
Code for prevention of explosions
Device group: II not for mining, but other hazardous zones
Device category: 2 for occasional danger
Atmosphere: D for dust
Explosion protection: International
Type of protection: "tb" for protection by enclosure
Explosion group: IIIC for conductive dust
Maximum surface temperature: T 125° C
Device protection level: Db for a high level of protection level in flammable dust
atmospheres
"X" special conditions
D Ex tb
⑥ ⑦ ⑧
tb IIIC
⑧ ⑨
IIIC T125°C
⑨ ⑩
T125°C Db
⑩ ⑪
Operation
8.5 Class
Db
⑪
X
⑫
85