Design Requirements
Electrostatic dissipative protective clothing must permanently cover all non-complying materials during normal use (including bending and movements)
If electrostatic dissipative protective clothing comprises several layers (e.g. lining, insulation and outer layer), the outermost material must comply with the material requirements.
Electrostatic dissipative protective clothing must be in suitable sizes complying with the specifications of EN 340 and enable complete freedom of movement of the body with all closures fastened according to the manufacturer´s instructions.
Non-dissipative inserts such as labels, reflective stripes, etc. which are essential for safety reasons are allowed if permanently attached in such a way as to prevent significant separations between the insert and the electrostatic dissipative garment.
Conductive parts (zippers, buttons, etc.) are allowed if properly covered by an outer material when the garment is worn in flammable or explosive atmospheres.
Design requirements (standard 1149:1995)
Electrostatic dissipative protective clothing consisting of a one-piece or two-piece garment must always cover the body, arms and legs.
The clothing must be designed to permit the dissipation of charges through the garment and direct contact between the skin and the conductive component of the garment, for example at the neck and wrists.
The folds at the extremities of garments, e.g. sleeves, trouser ends and collar must increase the ability of the electrostatic dissipative material to come into contact with the skin.
The width of the exposed surface of closure accessories such as zippers must be less than 10 mm.
Note 1 Dangerous discharges from clothing underlayers are avoided by ensuring that such underlayers are completely covered by the outer garment. Therefore, the jacket of a two-piece garment must be sufficiently long to cover the top of the trousers even when the wearer is bent forward.
Note 2 Example of folds – Surface of a conductive garment folded from the outside toward the inside of the sleeves.
Note 3 If the conductive component of the garment cannot come into contact with the skin, it should be directly earthed.
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