MH-817894 UL插头绝缘电阻试验装置|铅珠绝缘电阻测试盒

MH-817894 UL插头绝缘电阻试验装置|铅珠绝缘电阻测试盒

技术参数

符合UL817第89.4条标准要求，配合7#铅珠（OD 0.10 inch (2.5 mm)）测试，适用于UL插头两插和三插测试绝缘电阻用。与绝缘电阻测试机配合才能使用。

说明：市场上不少用钢珠当铅珠销售，价格相差几十倍，易生锈，满足UL817标准。除非客户指定要钢珠本司才销售。

试验方法

1. 所有试样在室温下至少保持48h;

2. 试验前，将钢珠盒测试座上的零线、火线、地线脚用铜线相连短路(出厂前已短路)；

3. 将试样插入钢珠盒相应测试座内，对调隔板（插孔朝内），直至钢珠能够完全将连接件（插头）埋没，钢珠便可作为与被试表面接触的电极进行测试，如下图；

4、使用DC500V开路输出电压的电磁式兆欧表或类似绝缘电阻测试仪，其中电阻表一极接入钢珠盒内钢珠中的电极，另一极与相连短路的导线（或测试脚）相连。测试1min稳定后读取示值，绝缘电阻应不小于100MΩ；

5.判定：测量值均不得小于100MΩ。

更多知识

绝缘电阻测量方法与要求，应测量下列3项的绝缘电阻:

1．相对极性带电部件之间的;

2．带电件与暴露在外可被人接触到的或可能用于接地的非带电金属之间的;

3．带电件与暴露在外可被人接触到的或可能与接地接触的任何绝缘材料表面之间的（本试验装置用于此项）;

注意：在测试中预防触电，身体任何部分不可与导电部件接触，包括导电极，铅（钢）珠等。

89 Insulation Resistance Test

89.1 The insulation resistance of a fitting shall not be less than 100 megohms between:

a) Live parts of opposite polarity,

b) Live parts and dead metal parts that are exposed to contact by persons or that may be grounded in service, and

c) Live parts and any surface of insulating material that is exposed to contact by persons or that may be in contact with ground in service.

89.2 To determine compliance with 89.1, the insulation resistance is to be measured by a magneto megohmmeter which has an open-circuit output of 500 V or by equivalent equipment.

89.3 The use of a megohmmeter between live parts requires no special clarification or instruction.

However, in measuring insulation resistance to the surface of an insulating material, it is necessary to apply the electrode to the insulating material as described in 89.4.

89.4 A quantity of No. 7 lead drop shot [approximate diameter 0.10 inch (2.5 mm)] is to be placed in a container which is open at the top. After cord holes or other openings through which the shot can enter have been plugged carefully with a high-resistance insulating material, the fitting is to be immersed in the shot so that the shot serves as an electrode in contact with the surface to which the test is to be applied.

89.5 All rubber parts are to be kept for at least 48 hours at room temperature before being subjected to the test mentioned in 89.1 – 89.4.