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Why grounding mat is important near ground switch operating handle and disconnecting switch operating handle? |
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Answer» Equipment operating handles deserve special attention because of the higher probability for co-incidence of adverse factors. For example, a. Hand operation equipment such as grounding switches and disconnecting switches requires the presence of operator near a grounded structure at a point where opening of an energised circuit can some times result in an arc to the structure or perhaps mechanical failure and electrical break down of a switch insulator. A large percentage of fatal accidents from voltage gradients are in fact associated with operating handles. Hence in order to avoid above problems following should be an additional safety factors: 1. Use closer mesh in the vicinity of operating handle area (150-mm approx.) and operating handle shall be directly connected to the earthing mat. 2. Use higher resistance surfacing such as crushed rock or both in order to bring down the values of touch potential and step potential. |
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