What are the principles and types of fireproof cables

1、 Cables are mainly copper conductors:

Conductors can be divided into bare copper, copper plating, copper clad steel, copper alloy, copper foil wire, etc.

Bare copper - low conductor resistance, easy oxidation, copper plating - enhanced oxidation resistance

Tinned copper - enhanced oxidation resistance, easy for subsequent welding, silver plated copper - strong conductivity, high price, mostly used in RF cables and fluoroplastic high-temperature wires

Copper clad steel --- high strength, commonly used for overhead cables

Copper alloy --- high strength (a small amount of other metals are added to copper)

Copper foil wire --- strong bending resistance and high flexibility (copper is pressed into thin sheets and wrapped on elastic fibers)

In order to improve the strength of conductors, multiple copper wires are usually twisted

2、 Cable insulator:

Common insulating materials include PVC (polyvinyl chloride), sr-pvc (semi-rigid PVC), PP (polypropylene), PE (polyethylene), Foam PE, Foam PE + skin, as well as the latest magnesium oxide (MI) mineral insulator.

3、 Type of fireproof cable:

Yttw -- the outer surface of the fireproof cable is welded with copper strip, and the inner cable core insulation is wrapped with fire-resistant mica tape. Finally, the cable is made of glass fiber or other fire-resistant fillers.

Bbtrz -- the fireproof cable has the same structure as the above, that is, the fire-resistant mica tape is replaced by ceramic silicone rubber tape. I don't know which of the two cables with different insulation is better.

Ng-a -- the outer sheath of fire-proof cable is made of aluminum, that is, from copper strip longitudinal package welding rolling grain to aluminum strip longitudinal package welding rolling grain, and the inner cable core may be wound with several layers of fire-resistant insulating tape.

Btly - the external protection of the fireproof cable adopts continuous extrusion aluminum tube, and the protection of the inner cable core is also continuous extrusion coated aluminum tube. The aluminum tube protection inside and outside the cable is smooth rod without rolling grain. The bending performance of this cable must be a flexible fireproof cable without longitudinal package welding and rolling grain.

Bttz - mineral insulated cable, also known as magnesium oxide cable, this cable should be a cable with good fire resistance, but the production process is very complex, mainly because the filling of magnesium oxide powder is difficult to do, and the equipment for producing this cable can not be made in China, which mainly depends on the introduction of advanced technology and equipment.

In short, the principle of fire-proof cable is different according to the materials and manufacturing processes adopted, so the fire-proof effect is different. We specialize in the production of mineral insulated cable and branch cable. The mineral insulated copper sheathed flexible fire-proof cable independently developed and produced is the first exclusive patented product in China and master the core technology.