As an important part of the power transmission of the fire protection system of construction engineering, mineral fire-proof cable has very high requirements for safety and reliability. It can be said to be the "lifeline" for rescue in case of fire. Today, let's learn how to select high-quality mineral fire-proof cable.

First of all, let's understand the characteristics of mineral fire-proof cable: with the improvement of everyone's safety awareness, mineral insulated cable is required in the fire protection design code of civil buildings. According to its structure, it can be divided into rigid mineral insulated copper sheathed cable and flexible mineral insulated copper sheathed cable, which we usually call fire-proof cable.

The continuous working temperature of mineral fireproof cable is 250 ℃. It can supply power continuously for 3 hours at 950 ℃ - 1000 ℃. It can work close to the melting point of copper at 1083 ℃ in a short time or in an extraordinary period. It is suitable for lines with rated voltage below 1000V. It is generally used in important electrical engineering fields, such as dangerous areas: airport, oil depot, liquefied gas station, chemical industry, coal mine, (nuclear) power station, steel smelting and shipbuilding; Advanced important public facilities: satellite ground station, railway wiring, alarm, fire control, etc; Places to ensure personal and property safety: historic buildings, hotels, high-rise buildings, museums, libraries, banks, hospitals, insurance, shopping malls, scientific research institutions, etc.

What are the details to pay attention to when purchasing?

Generally, 3C certification in the cable industry refers to the national compulsory certification of wires and cables below 450 / 750V voltage level. Since the rated voltage of mineral insulated cables is above 500 / 750V voltage level, it belongs to the scope of production license and does not belong to the scope of 3C certification. When purchasing, we can see whether there is a wire and cable production license project on the business license of the enterprise.

Mineral insulated cables have a special quality certification Department of the national wire and cable quality inspection center, which can require the manufacturer to produce a qualified inspection report during procurement.

In fact, among the current mineral cable models, only bttz and yttw have national standards, and the rest are only industry standards or enterprise standards. Judging from the cable structure, mineral cables require metal sheath, while bbtrz flexible mineral cables do not contain metal sheath.

Because of the high technical content of mineral insulated cable, copper tube drawing annealing technology is adopted. Not every enterprise has production capacity. When choosing, the strength and technical maturity of the manufacturer shall be considered. Boyi cable has advanced production technology, short supply period and support customization. Ng / a-btly / yttw and other cables adopt metal continuous forming process in the production process, so that the continuous production length of a single cable can meet the customer's requirements, so that the whole cable can be delivered in a reel without joints. You'd better visit the production line when purchasing