Zone 1_2 vs Zone 21_22_ Cable Gland Selection
                     Zone 1/2 vs Zone 21/22
Cable Gland Selection
Precise Technical Guidance for Chemical & Pharmaceutical Plants Coexisting Gas & Dust 
Hazards | Exgrip Engineering
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The Hazard Coexistence 
Why chemical andC phahrmaacelutliceal pnlangts reequire distinct hazard 
mapping for flammable gases and combustible dusts.
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Gas vs. Combustible Dust Classifications
Zone 1 & Zone 2 (Gas Hazards) Zone 21 & Zone 22 (Dust Hazards)
Zone 1: Explosive gas or vapour atmosphere likely during Zone 21: Combustible dust cloud likely during normal 
normal operation (solvent charging, reactor vents, tank operation (powder milling, sieving, pneumatic conveying 
farms). lines).
Zone 2: Atmosphere unlikely and brief during abnormal Zone 22: Dust cloud brief or abnormal (bagging and 
conditions, adjacent to Zone 1 boundaries. drum-filling lines where containment seals experience 
stress).
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Why Chemical Plants Face Both Hazards
Wet Process Bays Dry Powder Lines Shared Infrastructure
Solvent-based reactions, extractions, and Powder milling, micronizing, and Multi-product facilities running wet and 
liquid storage tanks generating flammable pneumatic transport generating dense dry processes side-by-side on common 
vapours under regular operating cycles. combustible dust clouds during batch electrical cable routes and junction boxes.
operations.
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Hazard Classification Reference Matrix
Zone Hazard Type Probability / Presence Typical Chemical Plant Location
Zone 1 Gas / Vapour Likely during normal operation Solvent charging points, reactor vents, pump seals
Zone 2 Gas / Vapour Unlikely, brief duration Areas adjacent to Zone 1 process equipment
Zone 21 Combustible Dust Likely during normal operation Powder milling, sieving, pneumatic lines, dryers
Zone 22 Combustible Dust Unlikely, brief duration Bagging stations, drum-filling lines, packaging
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Product Selection & 
Matching Exgrip'sE runggegd prionducet arechitrecitunre tgo extreme chemical 
and hazardous environments.
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Exgrip Cable Gland Ranges: DCAB vs A2F
DCAB Range (Armoured Double Compression): Built specifically for steel wire armoured (SWA) cables requiring secure 
armour clamping and positive earth continuity across heavy motor feeds and process lines in Zone 1/2 and 21/22. Available in 
IP66, IP67, and IP68 ratings.
A2F Range (Unarmoured Single Compression): Engineered for unarmoured or braided cables requiring reliable outer 
sheath sealing for instrumentation and control cabling across hazardous chemical process areas. Available in IP66 and IP68 
variants.
Material Choices: Manufactured in standard Brass for regular environments, Nickel-Plated Brass for moderate solvent vapor 
exposure, and 316 Stainless Steel for extreme aggressive chemical and coastal plant setups.
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Global Certifications & Protection Concepts
Certification Issuing Body Gas Protection Concept Dust Protection Concept
ATEX EU Notified Bodies (SIRA, TÜV, etc.) Ex db / Ex eb (II 2G) Ex ta (II 2D)
IECEx IECEx Accredited Test Labs Flameproof / Increased Safety Protection by Enclosure (Ex ta)
PESO / IS 2148 PESO India & BIS Approved Houses IS 2148 Aligned with IEC 60079-1 Dust Ignition Protection Confirmed
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Secure Your Plant 
Ensure foolproof compliance Tacrooss gdas aand ydust zones with Exgrip precision 
engineering.
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