One、The ratio of the cable diameter to the cross-sectional area of the cable.
When running cables through conduit, the inner diameter of the conduit shall not be less than the following values:
When the length of cable protection pipes is less than 30m, the internal diameter should not be less than 1.5 times the outer diameter of the cable.
When the length of cable protection pipes exceeds 30m, the inner diameter should not be less than 2.5 times the outer diameter of the cable.
Two. Why is it necessary to leave space inside the conduit when installing cables?
Due to the heat generated during the use of electrical wires, there is a need for effective heat dissipation. Electrical conduits are embedded within the wall, while the wires are housed within the conduits. The purpose of placing wires within conduits is to provide a space for heat dissipation, rather than directly sealing the wires within the wall. If electrical wires are tightly packed within the conduit, the conduit loses its functionality. When electrical wires overheat due to poor heat dissipation, this can lead to short circuits, which can be dangerous and even cause fires.
Three, Key points for selecting electrical conduits and wires for home use.
1、Excellent fire resistance and compressive strength are required.
Selecting flame-retardant and pressure-resistant cable conduits can effectively prevent damage to electrical wiring caused by external pressure or open flames, providing greater peace of mind during use.
2、The strength of the conduits must be differentiated.
There's also a small detail: power and data cables must be kept separate. In typical residential installations, red conduits are for power cables, and blue conduits are for data cables. It's important to distinguish between the two.