Different shielding structures: full shield, split shield, split shield+full shield.
The shielding materials are different: bare copper wire braided shield, tinned copper wire braided shield, tinned copper wire wrapped shield, tinned copper wire braided shield+aluminum-plastic composite tape shield, aluminum foil/aluminum-plastic composite tape shield+drainage line, copper tape/copper foil+drainage line.
The steel belt is actually a shield, so you can refer to the grounding below.
1. When the cable is only shielded by a single layer, one end of the shielding layer is equipotentially grounded.
2. When the cable adopts double insulation shield, both ends of the outermost shield are grounded, and one end of the inner shield is equipotentially grounded.
3. When cables are used in places with serious interference, frequent rodent damage and lightning protection and explosion protection requirements, it is recommended to use a pair of armored twisted-pair shielded cables (patent number: 201020559128.9)-astp-120Ω (for RS485 & CAN)1.
Grounding resistance should not be greater than 4Ω!