Tabulated Guide to Hazardous Area Info

HAZARDOUS AREA / CLASSIFIED LOCATION DETERMINATION

Jurisdiction	Source of Hazard	Continuous Hazard	Intermittent Hazard	Accidental Hazard	Standard
IEC / EC	Gas	Zone 0	Zone 1	Zone 2	IEC 60079
USA – NEC 505	Gas	Zone 0	Zone 1	Zone 2	NEC 505
Canada	Gas	Zone 0	Zone 1	Zone 2	CEC 18
IEC / EC	Dust	Zone 20	Zone 21	Zone 22	IEC 61241
USA – NEC 506	Dust	Zone 20	Zone 21	Zone 22	NEC 506
USA – NEC 500	Gas, Dust,	Division 1	Division 1	Division 2	NEC 500
Canada	Fibres & Flyings	Division 1	Division 1	Division 2	CEC 18

GAS HAZARD CLASSIFICATIONS

Representative Gas	IEC / EC	USA NEC 505 / Canada CEC 18	USA NEC 500 / Canada CEC Annex J
Acetylene	Group IIC	Group IIC	Class I, Group A
Hydrogen	Group IIB+H2	Group IIB+H2	Class I, Group B
Ethylene	Group IIB	Group IIB	Class I, Group C
Propane	Group IIA	Group IIA	Class I, Group D
Methane	Group I*	Mining*	Mining*
*Not within the scope of NEC 500 & 505—under jurisdiction of MSHA. Not within the scope of CEC 18.

DUST HAZARD CLASSIFICATIONS

Material	IEC / EC 60079	IEC / EC 61241	USA NEC 506	USA NEC 500 / Canda CEC 18
Metal Dusts	Group IIIC	Group D	–	Class II, Group E
Carbonaceous Dusts	Group IIIB	Group D	Group D	Class II, Group F
Non-Conductive Dusts	Group IIIB	Group D	Group D	Class II, Group G
Fibers & Flyings	Group IIIA	Group D	Group D	Class III

PROTECTION METHODS – USA UNDER NEC 500

Method	Basis	Standard	Division 1	Division 2
Intrinsic Safety	Energy limiting	FM 3610 / ISA12.02.01	Yes	Yes
Non-Incendive	Energy limiting, mechanical seal	FM 3611	No	Yes
Exlosion Proof	Containment	FM 3615	Yes	Yes
Pressurization ‘X’	Exclusion	FM3620	Yes	Yes
Pressurization ‘Y’	Exclusion	FM3620	Yes	Yes
Pressurization ‘Z’	Exclusion	FM3620	No	Yes

PROTECTION METHODS, GAS HAZARDS – USA UNDER NEC 505 / IEC / EU

Method	Symbol	Basis	Standard	Zone 0	Zone 1	Zone 2
Intrinsic Safety	ia	Limit spark energy and surface temperatures	60079-11	Yes	Yes	Yes
Intrinsic Safety	ib	Limit spark energy and surface temperatures	60079-11	No	Yes	Yes
Intrinsic Safety	ic	Limit spark energy and surface temperatures	60079-11	No	No	Yes
Energy Limitation	nL	Limit spark energy and surface temperatures	60079-15	No	No	Yes
Increased Safety	e	No arcs, sparks, or hot surfaces	60079-7	No	Yes	Yes
Non Sparking	nA	No arcs, sparks, or hot surfaces	60079-15	No	No	Yes
Flameproof	d	Contain the explosion, quench the flame	60079-1	No	Yes	Yes
Enclosed Break	nC	Contain the explosion, quench the flame	60079-15	No	No	Yes
Sand Filling	q	Quench the flame	60079-5	No	Yes	Yes
Pressurization	px	Exclude the flammable gas	60079-2	No	Yes	Yes
Pressurization	py	Exclude the flammable gas	60079-2	No	Yes	Yes
Pressurization	pz	Exclude the flammable gas	60079-2	No	No	Yes
Simple Pressurization	nZ	Exclude the flammable gas	60079-15	No	No	Yes
Sealing	nC	Exclude the flammable gas	60079-15	No	No	Yes
Restricted Breathing	nR	Exclude the flammable gas	60079-15	No	No	Yes
Encapsulation	ma	Exclude the flammable gas	60079-18	Yes	Yes	Yes
Encapsulation	mb	Exclude the flammable gas	60079-18	No	Yes	Yes
Oil Immersion	o	Exclude the flammable gas	60079-6	No	Yes	Yes

INGRESS PROTECTION CODES TO IEC 60529

First Numeral:		Second Numeral:
Protection against solid objects		Protection against liquids
0	No special protection	0	No special protection
1	Objects >50mm diameter, e.g. hand	1	Vertically dripping water
2	Objects >12.5mm diameter, e.g. finger	2	Dripping water when tilted up to 15°
3	Objects >2.5mm diameter, e.g. tool	3	Sprayed water up to 60° from vertical
4	Objects >1.0mm diameter, e.g. wire	4	Splashed water from any direction
5	Dust protected. Ingress insufficient to prevent satisfactory operation	5	Water projected by 6.3mm nozzle from any direction: 12.5 L/min, 100kPa, 3 min.
6	Dust tight, no ingress permitted	6	Water projected by 12.5mm nozzle from any direction: 100 L/min, 100kPa, 3 min.
		7	Temporary submersion up to 1 meter
		8	Continuous submersion to a stated depth