Once, there was a tender for power cables in the company, and it specified intrinsically safe cables – I had no idea what that meant
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Once, there was a tender for power cables in the company, and it specified intrinsically safe cables. I had no idea – do cables even come in intrinsically safe versions? How exactly should it be said?
It is suitable for intrinsically safe equipment and systems in industries such as petroleum and chemicals; it can not only transmit weak analog and digital signals over a wired connection. Moreover, the cable has high anti-interference performance and stable electrical properties. It ensures the accuracy of the transmitted signal parameters and the safe operation of the control system.
So what’s the difference between it and ordinary cables?
Intrinsic safety cables and flameproof cables are both types of explosion-proof cables, with only different explosion-proof requirements. Intrinsic safety cables are used for connecting intrinsic safety instruments, usually to form an intrinsic safety circuit, especially when a Zener-type isolation barrier is used; flameproof cables are used for connecting flameproof instruments.
Intrinsic safety cables are blue in color, making them easy to identify. Intrinsic safety systems limit current and voltage, allowing the wiring boxes to be opened while the system is still powered on; LZ can first take a look at the basic information available online
The principle of intrinsically safe operation lies in limiting the energy of electric sparks and thermal effects, thereby keeping the voltage and current in the circuit within acceptable limits. This ensures that the energy generated by the instruments and circuits is not sufficient to ignite explosive gases, thus achieving intrinsic safety. Intrinsic safety cables are designed specifically for intrinsic safety electrical instruments and meters. Their distribution parameters must meet the requirements for intrinsic safety and explosion protection, with the following basic parameters: the maximum allowable distributed capacitance of the cable, Ci, is given by Cc = Ck * L; the maximum allowable distributed inductance of the cable, Lc, is given by Lc = Lk * L. Here, Ck represents the distributed capacitance per unit length of the cable, Lk represents the distributed inductance per unit length of the cable, and L represents the actual length of the wiring. In terms of material selection, such cables offer higher interference resistance compared to ordinary cables, enabling better control of circuit energy and ensuring the intrinsic safety of the circuit. Additionally, intrinsically safe cables all have a blue outer cover for identification.