What does the S mean in the description of the wire?

s is the cross-sectional area of the carrier conductor of the wire。The specification of the cable means that the cross-sectional area of the core of a single conductor is 2 5 square millimeters. It does not refer to the cross-sectional area of the entire wire.

If there are multiple cores, such as 4, it means that it is a 4-core cable, and the cross-sectional area of each core is 2 5 square millimeters.

The first group consists of one to two letter groups, indicating the type and purpose of the wire. The second group is a letter that indicates the material of the conductor material. The third group is a letter that indicates the insulation.

The fourth group is a letter that indicates the sheath. The fifth group is a letter that represents a feature.

Square refers to the cross-sectional area of the "core". Generally, a micrometer or caliper is used to measure the conversion method: knowing the square of the wire, calculating the radius of the wire is calculated using the formula of finding the area of a circle.

Number of wires squared (mm²) Pi (square of wire radius (mm) Knowing the square of the wire, the same is true for calculating the wire diameter.

S is the signal communication line, S1 refers to the alarm return route, K or C on the line refers to the direct start line, M in the box refers to the fire module box, and C in the box refers to the control module.

The fire protection drawings are roughly divided into 4 majors, and construction, electrical, water supply and drainage, and HVAC all have fire protection requirements. Generally speaking, to understand the drawings, we must first learn the basic drawings, this is the most basic, you can go to the book orange Boxiang store to buy a book of architectural drawings or search for some textbooks on the Internet, combined with the drawings of the simple silver rolling order to learn.

Fire in the s, means: double, should be twisted pair;

Other meanings: S: brush, filament, RF (use code), double, steel plastic sheath (stalpeth), LSZH flame retardant sheath.

s is the cross-sectional area of the carrier conductor of the wire

S - halogen-free flame retardant thermoplastic polyolefin sheath or lining;

Attached: Model number with letters and numeric meaning:

NH - passed the class fire resistance test;

zr - pass the quasi-bundled combustion test;

b - low halogen (last position of model);

c——halogen-free and low smoke (last of the model);

YJ - XLPE insulation;

v——Low halogen flame retardant PVC sheath or lining;

S - halogen-free flame retardant thermoplastic polyolefin sheath or lining;

22-steel belt armored low-halogen flame retardant polyvinyl chloride outer sheath;

24 - steel belt armor halogen-free flame retardant thermoplastic polyolefin outer sheath.