ENGLISH
7.3 - Using tools in an explosive atmosphere
The operating managers for the installations and processes which include explosive atmospheres must provide all persons working
on a site with information relating to using manual tools in complete safety. There are two different types to be taken into consideration:
-
Type A: Tools liable to only produce single sparks when used, such as screwdrivers, spanners or impacts wrenches, for example;
-
Type B: Tools that generate a plume of sparks, which may be used during grinding or sawing operations.
In zones 1 and 2, only type A tools are permitted; use of type B tools can only be authorised if no dangerous explosive atmosphere is
present within the working area.
In zone 1, and in the presence of substances belonging to group IIC (acetylene, carbon disulphide, hydrogen) and hydrogen sulphide,
ethylene oxide, carbon monoxide, if there is a risk of explosion due to the presence of these substances, the use of steel tools is
prohibited unless it can be assured that no dangerous explosive atmosphere remains in the place of work whilst these tools are being
used.
The use of tools in zones 1 and 2 must be subject to the "work permit" system.
All other types of tools or equipment required for maintenance operations (vacuum cleaners, etc) must be compatible with use in the
ATEX zone in question. Otherwise, it must be ensured that, prior to and for the duration of any maintenance operation, the place of
work is sufficiently ventilated to prevent the presence or formation of an explosive atmosphere.
7.4 - Appendix
Control sheet.
Date
Check or
Test performed
Initial values
Number of
hours
of service
Type of
operation
Comments
Approved Failed
Vibration speed on the
motor bearing, impeller
side. (According to
standard ISO 14694)
Equipotential bonding
between the motor and
the impeller (properly
tightened).
-
Equipotential bonding
between the user ground
and the unit.
-
Impeller inspection.
-
Motor current check.
Room temperature.
Accumulation of dust
on the fan.
-
Ground continuity check.
Reference resistance in
Ohms
7 - SPECIAL INFORMATION FOR ATEX AREAS
27
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