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WhatAretheVariousMarkingsonExplosion-ProofElectricalEquipment|TechnicalSpecifications

Technical Specifications

What Are the Various Markings on Explosion-Proof Electrical Equipment

Explosion-proof markings on electrical equipment represent the specific explosion-proof construction employed in these devices.

Explosion Proof TypeGas Explosion-proof SymbolDust Explosion-proof Symbol
Intrinsically Safe Typeia,ib,icia,ib,ic,iD
Exmma,mb,mcma,mb,mc,mD
Barotropic Typepx,py,pz,pxb,pyb,pZcp;pb,pc,pD
Increased Safety Typee,eb/
Flameproof Typed,db/
Oil Immersed Typeo/
Sand Filled Moldq,qb/
N-typenA,nC,nL,nR,nAc,nCc,nLc.,nRc/
Special TypeS/
Shell Protection Type/ta,tb,tc,tD

These identifiers encompass a range of types, such as flameproof “d”, increased safety “e”, intrinsic safety “i”, oil-immersed “o”, sand-filled “q”, encapsulated “m”, type “n”, special type “s”, and designs for dust explosion-proofing, among others.

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