A:Verband der Elektrotechnik, Elektronik und Informationstechnik – more commonly known as VDE – is the Association for Electrical, Electronic and Information Technologies and their related sciences, technologies and applications.
A:Under no circumstances should cable and wire act as fuses enabling a fire to spread. They must not act as fuel for a fire, and should not release any dangerous substances. That is exactly what happens with materials whose flame retardation is based on halogens – i.e. fluorine, chlorine, bromine or iodine. Halogens are present in polymers like PVC, FEP, and PTFE. PUR, PP, P and TPE materials are often added as flame retardants. They can escape in case of a fire, and smother the surrounding flames. Later, however, they combine with water vapour to form acids that cause irritation to the eyes, skin and respiratory system, as well as attacking metal and glass.
A:Fire alarm cables are placed into three broad categories: plenum, non-plenum, and riser. Each of these corresponds to another standardized category. Plenum cable, to be used in ducts or other enclosed air spaces, is called FPLP; non-plenum cable, to be used in applications such as surface wiring, is FPL; and riser cable, which can be used in applications that go vertically from floor to floor, is FPLR. All of these names reflect where the fire alarm cable can be installed safely. Once you know where you will install the cable, you know in which category to start looking.
A:There are many safety precautions like voltage, abrasion resistance, chemical resistance, etc., that should be considered in choosing any kind of electrical cable, including that for fire alarms. However, there are some notable fire-related safety precautions to consider as well.
A:Firstly, it is important to isolate the installation from the mains supply before attempting to check or repair flooded cables. For obvious reasons, the sooner the flood recedes and action is taken the more likely it is that the cables will not be adversely affected. Find out what to do when the water subsides.
A:•Corrosive and acid gas
•Mass of zinc coating for galvanised wire armour
•Smoke emission
•Flame propagation test for multiple cables
•Shrinkage test on insulation
•Abrasion test
