Earthing devices


An earthing device defines a mechanical assembly used to achieve an electric circuit which perform an temporary connection of the conductors of the power networks with the ground. The mounting of the short-circuiting devices represents the main preventive measure to protect personnel against electric risk, in case of accidental occurrence of voltage at the working place. This working procedure must be carried out by two workers, in the following sequence of operations: a) Earthing the device, which is achieved by firm fixing of its earthing clamp to the artificial / natural earth grounding of the electrical installation or to the earthing rod, previously buried. b) Checking the absence of voltage on the conductors, using a voltage detector (eventually fixed on the coupling system of an appropriate insulating stick) c) Applying the phase clamps to the phase conductors, which assure a temporary electrical connection between the conductor and the earth. Depending on the type of the short-circuiting device and the voltage of the installation, this operation must be performed using appropriate insulating sticks or handles. The dismantling of the short-circuiting device should be performed in the reverse order. The earthing devices are manufactured in accordance with the standard SR EN 61230 and can be applied in indoor and outdoor electrical installations. The earthing devices can be single phase or poly phase (usually three phase) types. The earthing and short-circuiting cables are stranded type, made of copper, very flexible, class VI, according to the standard EN 60228:2005 and are protected with an insulating cover from transparent plastic material, directly extruded on the copper core strands, according SR EN 61138 standard. The phase and earthing clamps are specially designed and manufactured in a wide variety of structural forms in order to be easy and firm applied on various types of conductors of LV, MV or HV power networks.