Is there any Relationship Between the Thickness of the Sheath Layer and Wire Insulation Layer? In the eyes of senior electricians, if the thickness of the sheath layer of the sheathed wire is lower than the requirements of the national standard, it is considered unqualified.

How to Properly Install Low-voltage Cables?In the eyes of old electricians, when the joints of low-voltage cables have obvious damage, cracks and rust. So this means that the connector should not be used anymore. If the electroplating is uneven or there are bad situations such as missing needles, br