This standard specifies protective clothing intended for use in explosive environments (ATEX zones) where there is a risk that garments could generate sparks capable of igniting flammable substances.

To achieve CE marking with this symbol, the fabric’s antistatic performance must be tested according to:

• EN 1149-1 (Surface Resistance), or
• EN 1149-3 (Charge Decay).

Garment design is also a critical parameter for CE marking of antistatic/ATEX clothing.

How does EN 1149-5 work?

Electrostatic protective clothing prevents the build-up of static electricity on the body. The fabric contains conductive fibres that allow charges to dissipate safely into the ground, rather than discharging suddenly as a spark. In explosive atmospheres, even a very small spark can ignite gas, vapour or dust. By ensuring that the wearer is part of a fully earthed system, EN 1149-5 garments minimize the risk of accidental ignition and contribute to overall ATEX safety.

The effectiveness of EN 1149-5 garments depends on permanent earthing. The wearer must be in continuous conductive contact with the ground to dissipate electrostatic charges. This is typically achieved by combining conductive fabrics with footwear that complies with EN ISO 20344. The resistance between wearer and earth must remain below 10⁸ Ω.

Why Antistatic Properties Matter

With proper antistatic properties and correct garment design, the risk of spark generation is eliminated. ATEX environments are divided into zones based on the level of explosion risk. Antistatic garments certified to EN 1149-5 are suitable for use in ATEX Zones 1, 2, 20, 21, and 22.

In environments with elevated oxygen levels or in Zone 0, these garments must not be used without approval from a responsible safety officer. This is because wear and tear can affect antistatic performance. It is also essential that garments are worn correctly in ATEX environments.