QPS - Explosion Research Ltd

Hazardous Location Certification for Canada and the USA

 

 

Zone System nomenclature

 

Group /

Environment

 

Explosion Risk

MPL (Minimum Protection Level)

Zone

Ex code

 

Minimum protection technique

Base Standard used

I  (mines)

Energized

Ma

 

 

 

 

I  (mines)

Not Energized

Mb

 

 

 

 

II  (gas)

Explosive gas > 1000 hrs/yr

Ga

0

Ex ia

Ex ma

Intrinsic safety

encapsulation

60079-11

60079-18

II  (gas)

Explosive gas 10 to 1000 hrs/yr

Gb

1

Ex ib

Ex mb

Ex px

Ex e

Ex o

Ex q

Ex d

Ex s

Intrinsic safety

Encapsulation

Pressurized

Increased safety

Oil filled

Powder filled

Explosion Proof

special

60079-11

60079-18

60079-2

60079-7

60079-6

60079-5

60079-1

--

II  (gas)

Explosive gas 1 to  10 hrs/yr

Gc

2

Ex n

Ex ic

Ex pz

Ex py

Non-arcing

Limited energy

Pressurized

Pressurized

60079-15

60079-15

60079-2

60079-2

III  (dust)

Explosive Dust 1 >  1000 hrs/yr

Da

20

 

 

 

III  (dust)

Explosive Dust 10 to  10000 hrs/yr

Db

21

 

 

 

III  (dust)

Explosive Dust 1 to  10 hrs/yr

Dc

22

 

 

 

 

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