12089679 Rubber Seal Super Wire Seals For Auto Connector Plug

1.2 line protection design

For the current application of the engine line, the main guidance line of the line protection design, the application of the protection materials on the line, and the selection of the string of melting filaments on the line.

1) The selection of wire species is selected according to the standard of the vehicle application market. At present, most of the engine wire beams choose the German marking beam. The type is FLR9Y-B single core without shielding thin-wall polypropylene insulating low-voltage wires. The conductor is multi-stranded twitch Top soft copper wires, insulation use of halogen -free flame retardant materials, has excellent oil resistance and reliability.

2) After the selection of the cross -sectional area of the wire, after determining the wire species, the cross -sectional area of the wire should be determined according to factors such as the voltage drop, the load power and the heating of the wire.

The calculation formula of the cross -sectional area of the wire is:

A = i l / ud (1)

In the formula: A -wire cross -sectional area, mm2; i -current, A; ρ -copper wire resistivity; L -wire length, m; UD -wire allowable voltage drop, V.

In order to avoid excessive wire heating, the current density should be considered. The calculation formula is:

S = i / a (2)

Table 1 is the structure and current density of the German standard FLR9Y-B wire.

Of course, in the usual wiring beam design, you can directly select the cross -area of the wire according to the experience. Generally, the electrical equipment that usually works for a long time can choose a wire with a actual load of 60%, and the electrical equipment that works in a short time can choose the actual load of 60%~ 100%wire. That is, ordinary sensor signal cables, generally choose a wire with a cross -sectional area of 0.5 mm2; power cords or iron wires, generally choose a wire with a cross -sectional area of 2.5mm2.

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