Should a single layer of paper or plastic film insulate the aluminum foil from the screen?
2. when the cable is double insulated and shielded, the outermost shield is grounded at both ends, and the inner layer is shielded at one end with equipotential grounding.
3. when the cable is used for frequent and serious interference, rodent lightning protection, explosion-proof requirements of the place, should adopt the armored shielded twisted pair cable (patent number: 201020559128.9, beware of fake) ASTP-120 (for RS485 & CAN) one pair 18 AWG 12.3mm, the outer diameter of the cable around. When the utility model is used, both ends of the armour layer are grounded, and the innermost layer shields the earth at one end! The grounding resistance shall not be greater than 4 ohms! "GB 50217-2007 cable design specification" also has a similar expression
It depends on how you locate a single screen or double screenThe cable shielding grounding cable only 1. common single shielding, shielding layer is equipotential earthing.
