电线电缆使用时间久了后，表面的电线会慢慢腐蚀，出现老化现象。老化的电线如何继续使用，会存在较大的安全隐患，这就要求我们掌握一些方法，能及时的判断出电线是否老化。
After
using wires and cables for a long time, the surface wires will
gradually corrode and age. How to continue using aging wires poses
significant safety hazards, which requires us to master some methods to
promptly determine whether the wires are aging.
1.是指顺着导线观察其绝缘层，若发现绝缘层出现颜色失去光泽、变暗、变硬、裂纹、部分脱落。用双手弯曲绝缘导线时导线僵硬，甚至绝缘层开裂、绝缘层脱落等，这说明该导线已经出现了不同程度的老化和严重老化。
1.
It refers to observing the insulation layer along the wire, and if it
is found that the insulation layer has lost its luster, darkened,
hardened, cracked, or partially detached. When bending the insulated
wire with both hands, the wire becomes stiff, and even the insulation
layer cracks or falls off, indicating that the wire has undergone
varying degrees of aging and severe aging.
2.比较准确的判断线路绝缘状况,可利用绝缘电阻表对电气线路进行绝缘测量。
2.
To accurately determine the insulation status of the circuit, an
insulation resistance meter can be used to measure the insulation of the
electrical circuit.
3.不同线路的绝缘有不同的最低容许值。例如，使用中的家庭220伏线路，绝缘电阻最低为0.22兆欧,雨天潮湿数值不应小于0.1兆欧，如果所测绝缘电阻数值小于上述数值，说明电气线路绝缘有问题。
3.
The insulation of different lines has different minimum allowable
values. For example, for a household 220V line in use, the minimum
insulation resistance should be 0.22 megaohms, and the value should not
be less than 0.1 megaohms in rainy and humid days. If the measured
insulation resistance value is less than the above value, it indicates
that there is a problem with the insulation of the electrical line.