Page 156 - Petzl-catalog-pro-2018

Environments and standards
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Hazardous environments

There is a risk of explosion when six conditions are simultaneously met:
- presence of an oxidant: the oxygen in air, for example
- presence of a combustible: gas, vapor, dust or powder
Combustible
Oxygen in the air (gas or flammable - presence of an ignition source
vapor, dust) - suspended materials (gas, dust, aerosol...), propagation factors
- confined space: for example a vehicle, work space...
- an explosive mixture, which means having attained a concentration
of the combustible in the air sufficient to make an explosion possible
If an explosion hazard is identified in an environment, the hazardous
Source of locations are classified as areas at risk. All of the materials used in these
Explosive mixture combustion (flame, zones must conform with current regulations for this type of zone
spark, hot spot)
(ATEX and/or HAZLOC).

Suspended
Confined space
materials

How to choose a lamp suitable for an area with an explosion hazard?

It is possible to apply different regulations:
- ATEX regulations: European directive
- HAZLOC regulations: North American directive
Both aim to control the risks related to the explosion of certain environments. For this, they define:
- types of hazardous locations depending on the type of combustible and the presence of the hazard (permanent, occasional, accidental)
- equipment categories to be used depending on the type of location
- tests to be done for evaluating the equipment category
- product markings. These markings contain all the information necessary to determine the locations in which the product may be used
- security procedures to implement in hazardous locations (defining location boundaries, staff training, inspection visit...)
Thus, lamp choice is determined by the type of location where the lamp is to be used.

Classification of ATEX / HAZLOC locations

Gas type combustible Dust type combustible
Hazardous environments
ATEX HAZLOC ATEX HAZLOC
Permanent or long-term ZONE 0 Class I Div 1 ZONE 20 Class II Div 1

Occasional ZONE 1 Class I Div 1 ZONE 21 Class II Div 1
Accidental ZONE 2 Class I Div 2 ZONE 22 Class II Div 2

Example of ATEX location (gas type combustible)

ZONE 2
ZONE 0 ZONE 1

For more information on ATEX
ZONE 1
and HAZLOC regulations,
see Petzl.com
ZONE 0

Tetragon Distributors Inc.
sales@tetragon.ca www.tetragon.ca
905-828-9803