The control of the metal protective housing of the transformers (IP23) should include, inter alia (e.g. groundings, stop lamps, etc.) and the operation of control of the controls (keys, key-changing boxes, latches, etc.) of the mechanical cross-locking system with: Keys (mechanical key-interlocking system) with the upper middle class 20KV panel equipment, according to the Application Study (SME) for each geographic location separately.<br>
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