ET 105: National Rules for Electrical Installations in Potentially Explosive Atmospheres

These Rules apply to the design of electrical installations, the selection of apparatus and the installation of apparatus and conductors (live, protective and bonding), and the inspection and testing of these installations in areas where potentially explosive atmospheres may exist due to flammable gases, vapours, mists, fibres or dusts.
These Rules shall be observed in addition to the National Rules for Electrical Installations, Third Edition, ET101:2000. They apply to all electrical installations in potentially explosive atmospheres whether permanent, temporary or transportable. They apply to installations at Low Voltage and Extra Low Voltage.

These Rules do not apply to the following:

• electrical installations in mines susceptible to firedamp;

• inherently explosive situations, for example explosives manufacturing and processing;

• rooms used for medical purposes;

• installations such as those found in railway trains, aircraft, road transport vehicles, boats or ships;

• domestic installations;

• normal use of appliances burning gaseous fuels as defined in Directive 90/396/EEC.