1、检查起重机防爆的型式是否与现场环境相同起重机的工作制度是否与现场使用情况相符。 2、对防爆电气设备及其安装质量进行检查。检查起重机各主要部件（电机、控制按钮等电器） 外壳的明显处，是否设置有清晰的永久性的凸纹标志“Ex”和防爆型式、类别、级别。壳体 有无损伤、裂纹、锈蚀、螺栓应完整无缺无脱落。其次检查防爆型外壳密封间隙应不大于， 不允许密封间隙有划伤痕迹，更不允许用油漆黄油堵死，因为适当的间隙可保证火花在爆 炸时溢出压力，又不致使火花溢出壳外。最后还应检验外壳温升，其温升应低于规定值13摄氏度。 3、对电气配线进行防爆检查：应采用金属管配线。首先检查电缆或电线管的外观应无损伤，固定可靠，排列整齐。其次检查接线、分线盒的电缆引入口密封情况：是否设有橡胶封垫且不得变形、硬化或未加装，以隔绝火花，其密封间隙应不大于。电流引人器只能采用软电缆式引人器绝对禁止采用易产生火花的裸露带电金属体产生翅状滑动式电流引入器。 4、检査电气部件接地安装质量。首先检査接地线外观，应无损伤、腐蚀和松动。接地螺 栓必 须是钢螺丝，铜垫圈或镀锌弹簧垫圈，且无松动和损伤，然后检査接地电阻：为防止掉相产生火花，供电电源一般应采用中性点不接地的低压系统，其金属线管或槽壳、电动机、 配电箱等应接地，且应单独接地，接地电阻不大于。接地检查的主要目的是防止电器设备外壳带电或对地放电，以免引爆。 1. Check whether the type of crane explosion-proof is the same as the site environment. Is the crane working system consistent with the site usage? 2. Check the explosion-proof electrical equipment and its installation quality. Check the main parts of the crane (electric motor, control button and other electrical appliances), whether there is a clear and permanent mark "Ex" and explosion-proof type, category, level. The shell has no damage, cracks, rust, bolts should be intact without falling off. Secondly, check the seal gap of the explosion-proof shell should not be more than, do not allow the seal clearance to have scratch marks, and not allow the paint and butter to be blocked, because the proper clearance can guarantee the sparks spillover pressure in the explosion, and does not cause the spark to overflow the shell. Finally, the temperature rise of the shell should be tested. The temperature rise should be below 13 degrees Celsius. 3. Explosion-proof inspection of electrical wiring should adopt metal tube wiring. First, inspect the appearance of the cable or electric wire tube without damage, fixed, reliable and orderly. Secondly, check the sealing condition of the cable inlet of the wiring and dividing box: whether or not there is a rubber sealing mat and can not be deformed, hardened or not installed to cut off the spark, and its sealing gap should not be greater than. The current inducer can only use soft cable type inducers, and absolutely prohibit the use of bare charged metal which is easy to generate sparks. 4. The quality of grounding installation for inspection and inspection of electrical components. First, check the appearance of the grounding wire. It should be free from damage, corrosion and loosening. The grounding bolt must be steel screw, copper washer or galvanized spring washer without loosening and damage, and then checking the grounding resistance: in order to prevent the spark from falling out, the power supply should generally adopt a low voltage system with neutral point ungrounded, its wire pipe or tank, motor, distribution box, etc., and should be grounded, and should be grounded alone, The grounding resistance is not more than. The main purpose of grounding inspection is to prevent the electrical equipment shell from being electrified or to discharge to the ground, so as not to detonate.