- Resources
- Tabulated Guide to Hazardous Area Info
HAZARDOUS AREA / CLASSIFIED LOCATION DETERMINATION
| Jurisdiction | Source of Hazard | Continuous Hazard | Continuous Hazard | Accidental Hazard | Standard |
|---|---|---|---|---|---|
|
IEC / EC |
Gas |
Zone 0 |
Zone 1 |
Zone 2 |
IEC 60079 |
|
USA – NEC 505 |
Gas |
Zone 0 |
Zone 1 |
Zone 3 |
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.
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 |
Yes |
Yes |
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 |
Yes |
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 |
Yes |
Yes |
Yes |
|
Enclosed Break |
nC |
Contain the explosion, quench the flame |
60079-15 |
No |
No |
Yes |
|
Sand Filling |
q |
Quench the flame |
60079-5 |
Yes |
Yes |
Yes |
|
Pressurization |
px |
Exclude the flammable gas |
60079-2 |
No |
Yes |
Yes |
|
Pressurization |
py |
Exclude the flammable gas |
60079-2 |
Yes |
Yes |
Yes |
|
Pressurization |
pz |
Exclude the flammable gas |
60079-2 |
No |
No |
Yes |
|
Simple Pressurization |
nZ |
Exclude the flammable gas |
60079-15 |
Yes |
Yes |
Yes |
|
Sealing |
nC |
Exclude the flammable gas |
60079-15 |
No |
No |
Yes |
|
Restricted Breathing |
nR |
Exclude the flammable gas |
60079-15 |
Yes |
Yes |
Yes |
|
Encapsulation |
ma |
Exclude the flammable gas |
60079-18 |
Yes |
Yes |
Yes |
|
Encapsulation |
mb |
Exclude the flammable gas |
60079-18 |
Yes |
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 Objects >Vertically dripping water |
|
2 Objects >Objects >12.5mm diameter, e.g. finger |
2 Objects >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 |