Flame retardant Class B NH-JVVRP-42 fire-resistant armored signal cable

Flame retardant Class B NH-JVVRP-42 fire-resistant armored signal cable

Flame retardant Class B NH-JVVRP-42 fire-resistant armored signal cable

Category of wiring regulations for control system signal cables: Core business management level: Purpose: Reasonable cable laying can effectively reduce the impact of external interference on the system and reduce mutual interference between various cables. To improve the reliability of system operation, this regulation is established. Signal classification: Signal: Low level signals such as thermistor signals, thermocouple signals, millivolt signals, strain signals, etc. Level type switch input signal; Contact type switch input signal; Pulse input signal; General principle for signal cable layout: For a type of signal cable, shielded cables must be used, and shielded twisted pair cables should be used when conditions permit.

For Class II signals, shielded cables should be used as much as possible. Among them, shielded cables must be used for the input/output signals and input/output signals used for control and interlocking in Class II signals, and shielded twisted pair cables should be used if conditions permit. For Class III signals, it is strictly prohibited to bundle them with Class III signals for wiring. They should be treated as 200 volt power lines and wired together with power cables. If conditions permit, it is recommended to use shielded twisted pair cables.

For Class III signals, it is allowed to be wired together with a 200 volt power cord. Millivolt signals and strain signals in a certain type of signal should use shielded twisted pair cables, which can greatly reduce electromagnetic interference and electrostatic interference. If conditions permit, shielded cables should be used as much as possible for Class 1 to Class 4 signals, and it should be ensured that only one point of the shielding layer is grounded, and the grounding should be good,

It is prohibited to bundle high-power switch output signal lines, power lines, power lines, and other cables in parallel with Class I and Class II signal cables that directly enter the DCS system. It is prohibited to use some of the core wires in a multi-core cable for transmitting Class I or Class II signals.

Category of wiring regulations for control system signal cables: Core business management strictly prohibits the distribution of several core wires of the same signal in different cables.? In on-site cable laying, we must effectively separate cables that are prone to interference, such as third - and fourth class signal cables and power lines, and keep them at a certain safe distance from the cables of first - and second class signals laid on site. When using shielded twisted pair cables, the shielding layer is grounded at one end to prevent capacitive coupling, while twisted pair cables prevent inductive coupling. If tested