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Guide for hazardous areas

Protection concepts North America and Canada

The tables below list the types of protection methods and basic concepts of protection according to US and Canadian standards for electrical equipment that is to be operated or installed in hazardous areas. The matrix is constructed to enable the fast cross referencing of protection concepts for classes and divisions, or classes and zones including the applicable US and Canadian standards. 

For definitions of hazardous zones, please see Hazardous areas according to ATEX, IECEx zones and North American Classes and Divisions section.

Electrical equipment for flammable gases, vapours and mist
US code CAN code Type of protection Basic concept of protection Class I Div Class I Zone
 US Standard CA Standard
1 2 0 1 2
AEx e Ex e Increased safety No arcs, sparks or hot surfaces 


•
 •
 ISA 60079-7 CSA E60079-7
(NI) (NI) Non-incendive 

•

ISA 12.12.01 / FM 3611 C22.2 No. 213
AEx nA Ex nA Non-sparking
•


ISA 60079-15 CSA E60079-15
(XP) (XP) Explosion proof Contain the explosion and
extinguish the flame		 •
 •


UL 1203 / FM 3615 C22.2 No. 30
AEx d Ex d Flame proof


•
 •
 ISA 60079-1 / UL 1203 / FM 3615 CSA 60079-1
AEx q Ex q Powder filled


•
 •
 ISA 60079-5 CSA E60079-5
AEx nC Ex nC Enclosed break



•
 ISA 60079-15 CSA E60079-15
(IS) (IS) Intrinsic safety Limit energy of sparks and surface temperature •
 •


UL 913 / FM 3610 22.3 No. 157
AEx ia EX ia

•
 •
 •
 ISA 60079-11 / FM 3616 CSA E60079-11
AEx ib EX ib


•
 •
 ISA 60079-15 CSA E60079-15
AEx nL EX nL Limited energy



•
 ISA 60079-15 CSA E60079-11
Type X Type X Pressurised Keep flammable gas out •
 •


NFPA 496 (FM 3620) NFPA 496
Type Y Type Y •
 •


Type Z Type Z
•


AEx px Ex px


•
•
 ISA 60079-2CSA E60079-2
AEx py Ex py


•
 •
AEx pz Ex pz



•
AEx nR Ex nR Restricted breathing



•
 ISA 60079-15CSA E60079-15
AEx m Ex m Encapsulated


•
•
ISA 60079-18CSA E60079-18
AEx ma N/A

•
•
•
N/A
AEx mb


•
•
AEx oEx oOil immersion


•
•
ISA 60079-6CSA E60079-6



Electrical equipment for combustible dust
US code CAN code Type of protection Basic concept of
protection		 Class II Div Class III
Div 1&2
 Class II Zone US Standard CA Standard
1 2 0 20 21 22
(DIP) (DIP) Dust ignition protection Keep combustible dust out •
 •
 •


UL 1203 / FM 3616 CSA C22.2 No. 25
(NI) (NI) Dust protected
•
•



 ISA 12.12.01 / FM 3611 CSA C22.2 No. 25
AEx ta Ex ta Protection by enclosure


•
•
• ISA 60079-31 CSA C22.2 No. 60079-31
AEx tb Ex tb



•
•
AEx tc Ex tc



•
N/A N/A Fibre & flying protection

•



 UL 1203 / ISA 12.12.01 CSA C22.2 No. 25
AEx maD N/A Encapsulation


•
•
• ISA 60079-18 N/A
AEx mbD



•
•
(PX) (PX) Pressurisation •
•
•



 NFPA 496 (FM 3620) NFPA 496
(PY) (PY) •
•
•
(PZ) (PZ)
•
•
AEx pD N/A


•


 ISA 61241-2 N/A
(IS) (IS) Intrinsic safety Limit energy of sparks
and surface temperature		 •
•
•



 UL 913 / FM 3610 CSA C22.2 No. 157
AEx iaD N/A

•
•
•
ISA 60079-11 N/A
AEx ibD



•
•
Guide for Hazardous Areas 

E2S offers an extensive range of intrinsically safe, explosion & flameproof and non-sparking audible and visual signals, PA loudspeakers and manual call points for hazardous areas.

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