升降机用电量较大，它是大型施工电梯械设备，所以它的电源安全防护措施必须是安全可靠。

1、升降机电源一般采用普通308V、50Hz的三相五线交换电源供电，施工工地供电应当要做到“三级配电，两级维护”的用电标准要求。施工电梯须设置专用的开关箱，电压稳定应当不能超过±10%的额外值，供电容量应能满足设备的最低供电容量，绝缘电阻应大于0.5M。
Lift the power generally use ordinary 308V, 50Hz three-phase five-wire switching power supply, power supply construction sites should be to achieve the "three-tier distribution, two maintenance"power standards. Construction elevator shall be provided with a dedicated switch boxes, voltage stability should not exceed ± 10% of the additional value, the power supply capacity should be able to meet the minimum power capacity of the equipment, the insulation resistance should be greater than 0.5M.
2、升降机按划定应设置好过流、短路、欠压、过压及零位掩护、失压保护、电源错相和断相保护等措施；设备的专用开关箱应设有门锁，且设备的防护等级应高于P44，应当设有升降机紧急停止按钮完善的设施。
Lifts should be set according to delineate better flow, short circuit, undervoltage, overvoltage and zero cover, voltage protection, power-phase and phase failure protection and other measures;special switch box equipment shall be provided with locks, and equipment protection rating should be higher than P44, should lift the emergency stop button has excellent facilities.