Intrinsic Safety i2G4 or i3aG4

[kimseunghee]

I have seen 'i2G4 or i3aG4' on certificate. It looks like to be explosion protection in accordance with JIS.
Anybody tells me what means by each figure or charactor. I have only seen code marked by IEC or CSA.

 

[controlnovice]

I recently had these same questions and found these helpful tables here:

http://www.jicosh.gr.jp/english/guideline/ElectricalEquipment/1.html

2. Type of protection, explosion class and ignition group shall be indicated by the symbols shown in the following tables, respectively:

(1) Kind of type of protection

Kind of type of protection Symbol
Flameproof enclosure d
Pressurized enclosure f
Increased safety e
Oil-immersion o
Intrinsic safety i
Special s
Dust-explosion-protection Ordinary DP
Dust-explosion-protection Special SDP

(2) Explosion class

Limit of flame propagation (mm) Symbol
Over 0.6 1
Over 0.4 and not more than 0.6 2
Equal to or less than 0.4 3(3a 3b 3c 3n)
Note: 3a, 3b, 3c and 3n denote water gas, carbon disulfide, acetylene and all gases and vapours, respectively.

(3) Ignition group

Ignition point (degree) Symbol
Over 450 G1
Over 300 and not more than 450 G2
Over 200 and not more than 300 G3
Over 135 and not more than 200 G4
Over 100 and not more than 135 G5

So i2G4 would be: Intrinsically Safe, between 0.4 and 0.6mm flame propigation, and up to 200 degree C temperature rating.


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