Question for help: Intrinsically safe cables and flame-retardant cables

This post was last edited by MapleLeafSpy on 2020-4-23 at 20:42. Cables have different functions. The main functions of intrinsically safe cables are as follows: 1. The energy stored within them must not pose any danger; therefore, there are specific requirements regarding parameters such as capacitance and inductance of these cables. 2. Prevent other electrical devices from causing the energy transmitted by the cable itself to exceed dangerous levels. Therefore, requirements are placed on shielding, etc. Other requirements such as protection against mechanical damage and fire resistance are the same for cables used in explosion-proof applications as those for intrinsically safe cables. Intrinsic safety cables must not be laid together with flameproof cables, as the energy from flameproof cables can be transmitted to the intrinsic safety cables, causing the energy stored in them to exceed dangerous levels.

Intrinsic safety cables feature low capacitance and low inductance. When used in conjunction with safety barriers, they help to limit current flow and prevent the generation of sparks that could lead to explosions. They also offer good shielding capabilities and resistance to interference. Intrinsic safety cables and non-intrinsic safety cables should be installed separately

The specifications require separate laying, but it is difficult to achieve complete separation in actual projects. There is no such thing as an explosion-proof cable; only intrinsically safe and non-intrinsically safe cables exist.

Intrinsic safety cables are generally blue, while flameproof cables should be armored cables and should be installed separately. Explosion-proof cables are divided into intrinsically safe cables and flame-retardant cables.

I’m idle, so I’m answering here. Cables are divided into intrinsically safe and non-intrinsically safe types. In fact, there is no such thing as an \"intrinsically safe cable\" in terms of manufacturing standards; the only standards that apply are those related to cables themselves. However, industry standards do specify requirements for the installation of intrinsically safe cables, which creates a contradiction. In theory, any cable that can pass the verification required for intrinsically safe circuits meets the requirements; there is no such thing as an exclusively \"intrinsically safe cable.\" But since the standards require it, manufacturers are happy to produce an intrinsically safe cable. The so-called intrinsically safe cable is actually a cable with relatively low impedance and capacitive reactance; in most cases, using an intrinsically safe cable is sufficient to meet the energy limitation requirements of an intrinsically safe circuit (though this is not absolute, so calculations are necessary). Furthermore, there is no such thing as an explosion-proof cable; a cable is simply a cable, and there is only one type of it. Intrinsic safety cables are products developed by various manufacturers, following their own standards, and can be considered a special type of cable that is recognized as such.