| Electrical equipment for flammable gases and dust | |||||||||||||||
| Symbol | Type of protection | Basic concept of protection | Suitable for Zones |
Typical EPL |
EN / IEC Standard | ||||||||||
| 0 | 1 | 2 | 20 | 21 | 22 | Ga | Gb | Gc | Da | Db | Dc | ||||
| e | Increased safety | No arcs, sparks or hot surfaces, enclosure IP54 or better | • | • | • | 60079-7 | |||||||||
| n | Type ‘n’ (non-sparking) | • | • | 60079-15 | |||||||||||
| Type ‘n’ (closed-break) | Containment of the explosion | • |
• |
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| Type ‘n’ (sealed and hermetically sealed) | Keep the flammable substances out | • |
• |
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| Type ‘n’ (restriced breathing) | • |
• |
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| d | Flameproof | Containment of the explosion | • |
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60079-1 | |||||||||
| q | Powder filled | Quenching of the flame | • |
• |
• |
60079-5 | |||||||||
| ia | Intrinsic safety | Limitation of spark energy and surface temperatures | • |
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60079-11 | ||||
| ib | • |
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| ic | • |
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| px | Pressurised enclosure | Keep the flammable substances out | • |
• |
• |
60079-2 | |||||||||
| py | • |
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• |
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| pz | • |
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| ma | Encapsulation | • |
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60079-18 | |||||
| mb | • |
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| mc | • |
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| o | Oil immersion | • |
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60079-6 | ||||||||||
| Op pr | Optical radiation | Inherently safe, protected by shutdown | • |
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• |
60079-28 | |||||||||
| Op sh | • |
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| Op is | • |
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| ta | Dust ignition protection by enclosure | Dust-tight enclosure | • |
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60079-31 | ||||||||
| tb | • |
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| tc | • |
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| pd | Pressurised enclosure | Keep the flammable substances out | • |
• |
• |
61241-4 | |||||||||
| • |
• |
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