strain relief 测试 UL1017

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广东安规检测
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IEC60335试验指甲

5.14  Strain-relief
5.14.1     When tested as described in Clause 5.14.2 the strain-relief means provided on the power-supply cord shall withstand for 1 minute, without displacement, a force of 35 pounds (156 N) applied to the cord, with the connections within the appliance disconnected. The strain relief is not acceptable if, at the point of disconnection of the conductors, there is such movement of the cord as to indicate that stress would have resulted on the connections.
( ]( i; _5 Q7 y; r5.14.2     A 35 pound (15.9 kg) weight is to be suspended from the cord and supported by the appliance so that the strain-relief means will be stressed from any angle that the construction of the appliance permits.  
5.14.3     For the investigation mentioned in the Exception to Clause 4.4.3.2, four samples of the clamp that have been applied to the cord in the intended manner are to be used. One sample is to be subjected to the dielectric voltage-withstand and strain-relief tests in the as-received condition. The other three samples are to be placed in an air oven for 168 hours. The oven temperature is to be 10EC (18EF) higher than the maximum temperature measured on the cord at the strain-relief device under normal operating conditions, but not less than 70EC (158EF) in any case. The samples, after being conditioned in the oven, are to be subjected to the dielectric voltage-withstand and strain-relief tests. The value of the applied potential is to be as indicated in Clause 5.11. The potential is to be applied between the conductors and, if the clamp is metal, the potential is to be applied between the conductors and the clamp. After cooling to room temperature, the conditioned samples are to comply with the strain-relief test requirements in Clause 5.14.1 and the dielectric voltagewithstand requirements in Clause 5.11.
求助各位大侠，这个测试怎么做，用什么方法或设备能做了