Pipe clamp for explosion hazard areas
October 2011
IS & Ex
DEHN’s pipe clamp is designed for use in potentially explosive atmosphere Ex zones 1 and 2 (gases, vapours, fogs) as well as Ex zones 21 and 22 (dusts). It contacts pipes electrically in explosion hazard areas, for implementing lightning equipotential bonding according to EN 62305-3 (VDE 0185-305-3).
Previously, the method of choice for installing equipotential bonding and lightning equipotential bonding terminals in explosion hazard areas was to use welding or threaded bushings. The use of pipe clamps was only permitted if there was proof of ignition spark immunity in the case of lightning current loading.
DEHN has now proved the absence of ignition spark in a pipe clamp at lightning current loading. This was done in a test sample with a lightning current carrying capability up to 50 kA (10/350 μs). By meeting the requirements of EN 50164-1 (VDE 0185-201) it is possible to apply the connection components (clamps and connectors) in a potentially explosive atmosphere.
The novel pipe clamp provides a safe electrical contact by means of two contact clips, while allowing mechanical fixing by an electrically insulated clamping body. By eliminating the need to deactivate the system for welding or drilling work it also saves on installation time.
For more information contact Paul van As, Surgetek, +27 (0)11 792 1303, [email protected], www.surgetek.co.za
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