How to identify parts of electric chain hoist is qualified

You can be detected under the following conditions you buy electric wire rope hoist  whether the target:
1 hook mechanical testing shall comply with state regulations
(2) should be the next hook device prominently labeled with electric chain hoist rated capacity, due to avoid accidental slippage rigging locking device. Under universal hook to be able to rotate 360 degrees and flexible steering.
   3 electric chain hoist lifting chain shall not be less than GB/T10051. 1 requirements.
4 lifting chain guide should be installed on the chain and sprockets and cruises normal lifting engagement play a supporting role. Lifting chain from one end of the force shall be provided to prevent the crane from the lifting chain sprocket overwinding limiting device.
5 electric chain  lift hoist  motors to AC induction motor. Thermal insulation of the motor mechanism is not less than B grade classification. Motor protection, not less than GB/T4942. 1 IP rating of the provisions (other than the fan).
6 electric chain hoist motor winding on the metal casing shall withstand withstand voltage test 1 minute without the risk of insulation breakdown.
7 For rated power less than 1. 1KW motor, leakage current during the test should not exceed 10 mA, for the rated power is greater than 1. 1KW motor, leakage current during the test shall not exceed 20 mA.
8 at the rated voltage,Rope hoist rated frequency and no-load state, the three-phase motor phase current in any one phase and three phase deviation should be less than the average of the three-phase average.