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Catalogue BW Technical Catalogue

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'Innovators in Gas detection-

INFORMATION LIBRARY

Technologies

Hazardous Locations


Area Classification - Division versus Zone
	NEC & CEC (North American)	IEC
Continuous Hazard	Division 1 or Zone 0	Zone 0
Intermittent Hazard	Division 1 or Zone 1	Zone 1
Hazard Under Abnormal Conditions	Division 2 or Zone 2	Zone 2

Definitions and Comparisons

Class I Locations in which ammable gases or vapors are or may be present in the air in quantities suf cient to produce explosive atmospheres.

Comparisons of Classification Systems Between Division Codes (North America) and IEC Zone Codes (Worldwide)


	North American Division Codes	IEC and North American Zone Codes
	*Class I, Division 1:* Where ignitable concentrations can exist under normal operating conditions; may exist frequently because of repair, maintenance or leakage; or may exist due to breakdown of equipment in conjunction with an electrical failure.	*Class I, Zone 0:* Where ignitable concentrations are present continuously or for long periods of time. *Class I, Zone 1:* Where ignitable concentrations are likely to exist under normal operations; may exist frequently because of repair, maintenance or leakage; may exist due to breakdown of equipment in conjunction with an electrical failure; or adjacent to Class I, Zone 1 locations.
	*Class I, Division 2:* Where volatile ammable liquids are stored, etc., in closed industrial containers; where ignitable concentrations are normally prevented by positive pressure ventilation; or adjacent to Class I, Division 1 locations.	*Class I, Zone 2:* Where ignitable concentrations are not likely to exist in normal operations or may exist for a short time only; where volatile liquids are stored, etc., in closed containers; where ignitable concentrations are normally prevented by positive pressure ventilation; or adjacent to Class I, Zone 1 locations.

Approval Agencies and Regulatory Bodies

ACGIH: American Conference of Government Industrial Hygienists

ABS: American Bureau of Shipping

ASHRAE: American Society of Heating, Refrigeration and Air Conditioning Engineers

BAM: Federal Institute for Materials Research

and Testing (Germany)

CE: European Conformity

CEC: Canadian Electrical Code

CENELEC: European Committee for

Electrotechnical Standardization

CSA: CSA - International

FM: Factory Mutual Research Corporation

IEC: International Electrotechnical Commission

MSHA: Mine Safety and Health Administration

NEC: U.S. National Electrical Code

NIOSH: National Institute for Occupational Safety and Health

NRTL: National Recognized Testing Laboratory pointed by OSHA

OSHA: Occupational Safety and Health Administration

SABS: South African Bureau of Standards

SAA: Standards Association Australia

UL: Underwriters Laboratory

WHMIS: Workplace Hazardous Materials


Gases and Vapors Classification
Gas	CEC/NEC Code	IEC Code
Acetylene	Group A	Group IIC
Hydrogen	Group B	Group IIB + H₂
Ethylene	Group C	Group IIB
Propane	Group D	Group IIA
Coal Mines	Gaseous Mines	Group I