SINO Testing Services| 2019-12-13|Return
We know that the explosion-proof system in North America is very different from that in China/IEC/EU regions. Not only do they implement different standards, but their explosion-proof signs also differ greatly.
1. The National Electrical Code standard is widely adopted in North America. The identification of NEC explosion-proof electrical equipment differs significantly from the representation method specified by IEC. Generally, the explosion-proof type is not indicated, only the applicable category, zone, level, and temperature group are indicated. The current explosion-proof standards mainly include UL913 and TIA4950
2. The IEC and Chinese GB standards indicate their explosion-proof labels, explosion-proof structures, categories and levels of electrical equipment, and temperature groups.
The above two types of explosion-proof labels have their own advantages and disadvantages, but according to Chinese standards and regulations, the NEC label is not suitable for China's national conditions.
The characteristics of this symbol: For users, they do not need to know the explosion-proof structure type of the electrical equipment, but only need to confirm the environment used, the level of explosive hazardous media, and the ignition temperature group.
IEC and Chinese standards indicate: Ex+explosion-proof structure+category+level+group
Exe II T2
Indicating: Temperature group T2 for increased safety factories (allowing equipment to generate heat at temperatures below 300 ℃).
Exedia [ia] Ⅱ CT6
Indications: For increased safety, explosion-proof, and intrinsic safety (including safety barriers) factory use Class C temperature group T6 (allowing equipment heating temperature to be below 85 ℃). Generally, electrical equipment with this explosion-proof symbol is an explosion-proof electrical system.