The metal parts of electrical equipment shall be under the protection of zero or protection grounding measures.
(1) motors, transformers, electrical appliances, lighting appliances, portable and mobile electric appliances such as the base and the shell;
(2) electrical equipment transmission device;
(3) the voltage and current transformer secondary winding;
(4) distribution panel and the framework of the control panel;
(5) of the indoor and outdoor distribution equipment metal frame, primary reinforcement of reinforced concrete and metal fence;
(6) threading of steel pipe, metal connector, and cable head, box shell;
(7) equipped with a ground wire of electric power line tower and ideally on the distribution circuit pole switch equipment and shell of the capacitor.
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