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Protection Concepts

For Europe: CENELEC/ATEX Directive

INGRESS PROTECTION (IP) CODES

1st Digit No. Degree of Protection (Foreign Body) 2nd Digit No. Degree of Protection (Liquids)
0 No Protection 0 No Protection
1 Protection against ingress of large solid foreign bodies Ø 50mm 1 Protection against vertical dripping water
2 Protection against ingress of medium solid foreign bodies Ø 12.5mm 2 Protection against angled dripping water 75 to 90 degrees
3 Protection against ingress of medium solid foreign bodies Ø 2.5mm 3 Protection against sprayed water
4 Protection against ingress of medium solid foreign bodies Ø 1mm 4 Protection against liquid splashed from any direction
5 Protection against ingress of dust in any quantity sufficient to cause a malfunction 5 Protection against jets of water
6 Complete protection against ingress of dust 6 Protection against strong jets of water or heavy seas
    7 Protection against intermitent immersion in water
    8 Protection against strong indefinate immersion in water under a specific pressure
Colour Codes
Gas Group
Temp.
Class.
ATEX
CE Marketing Directive Basic Requirements
Low voltage Directive Electrical safety of equipment, voltage ranges 50-1,000 AC & 75-1500 DC 73/23/EEC
EMC Directive 89/336/EEC Electromagnetic emissions & immunity
Machinery Directive 89/336/EEC Mechanical & electrical safety
Atex Directive Hazardous Area Equipment (mandatory from 01/07/03). Currently accepted 94/9/EC
Category Group Equipment Groups
1 (mining) M1(methane/dust)
1 (mining) M2(methane/dust)
II (surface indust.) IIA (propane)
II (surface indust.) IIB (ethylene)
II (surface indust.) IIC (acetylene)
All Groups >D & G
Max. surface temperature Equipment Groups
450° C T1
300° C T2
200° C T3
135° C T4
100° C T5
85° C T6
Protection Concepts Symbol Zone Standard How it works Category
Increased Safety Ex e 1 & 2 EN 50019 No arcs, sparks or hot surfaces 2
Non-sparking Ex nA 2 EN 50021 3
Flameproof Ex d 1 & 2 EN 50018 Contain the explosion and quench flames 2
Hermetically Sealed Ex nC 2 EN 50021 3
Quartz / Sand Filled Ex q 1 & 2 EN 50017 Limit energy of sparks; limit the temperature 1
Intrinsic safely Ex ia 0, 1 & 2 EN 50020 2
Ex ib 1 & 2 EN 50039
Energy Limitation Ex nL 2 EN 50021 3
Pressurised Ex p 1 & 2 EN 50016 2
Simplified Pressurisation Ex nP 2 EN 50021 Keep the flammable gas away from any hot surfaces and ignition capable equipment 3
Encapsulation Ex m 1 & 2 EN 50028 2
Oil Emmersion Ex o 1 & 2 1 & 2 2
Restricted Breathing Ex nR 2 EN 50021 3
Special Ex s 0*, 1 & 2 EHSR (ATEX) Any proven method 1,2 & 3
    *= Label must indicate Zone 0    
Classification Criteria ATEX Marking
Zone 0 Flammable atmosphere present continuously (>1000 hrs/year) G Category 1 Equipment
Zone 20 D
Zone 1 Flammable atmosphere present intermittently (>10 <1000 hrs/year) G Category 2 Equipment
Zone 21 D
Zone 2 Flammable atmosphere present abnormally (<10 hrs/year) G Category 3 Equipment
Zone 22 D
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