Protective clothing with electrostatic properties. Here, you can read about protective clothing with electrostatic properties. The EN 1149-5 (testing method EN 1149-3) certification is for your safety. EN 1149-3:2004 – electrical discharge. This standard describes the breakdown of electrostatic charges from the surface of the clothing materials. EN 1149-5:2008 – materials performance and design This standard describes the requirements for the materials and design of electrostatic dissipative protective clothing which is used as part of a grounded system to prevent incendiary discharges.