Hebei plateau voltage fuse when rw12-10 / 200 is operated by two people. (A guardianship, an operation), but must be qualified by the trial wearing insulated gloves, wear insulated boots, wearing goggles, use a voltage rating matches qualified insulation rod operation, lightning or heavy rain weather inhibit operation. (2) When wind up operations, the general provisions of the first to pull off the intermediate phase, and then pull the leeward side of the phase, the final phase pull off the windward side. This is because the three-phase distribution transformers run into two-phase operation, pull off the arc sparks generated intermediate phase minimum, without causing phase short circuit. Second is to pull off the leeward side of the phase, because intermediate phase has been opened, the leeward side of the phase to phase windward edge distance doubling, even with over-voltage generated, resulting in the possibility of short circuits is small. Finally, with time to pull off the windward side, only to ground capacitance current, already very slight spark generated. (3) when closing sequence wind up the operation contrary, the first phase close windward side, and then close the leeward side of the phase, and finally close the intermediate phase. (4) Operating melting tube is a frequent project, not notice contact will result in burns cause poor contact, the contacts overheating, spring annealing, prompting more bad contacts the contact, creating a vicious cycle. So, pull, when combined melting tube to force moderate, after Hao, to double-check the duckbill tongue can closely link more than two-thirds the length of the tongue, can wind up hooked on the lever few downward pressure duckbill, then gently pull test to check for Hao. Closing time failed to put in place or close securely, insufficient contact pressure on the fuse quiet, can easily cause contact burns or fuse tube drop on their own.