The four methods of selection of cable tray specifications

1. According to the specifications of cable tray go select the total cross section of the cable bridge, total power cable sectional area usually not more than 40% of the area of the bridge section, control and signal cable total cross-sectional area not more than 50% of the bridge cross section area.

2. The total load of cable tray G, cable bridge width B calculation;

Total = G n1q1 n2q1 n3q3...
B = n1 n2 (k1 d1) (d2 k2)... (power cable)
Sn = n1n (d1) 2/2 n2n (d2) 2/2 S = S/B = S/h = 40% 40% Sn/h) control cable,
Check the 04 dx101-1, no cable has its outer diameter size, all the cable diameter.
3. Choose specifications according to bridge allows filling rate.
4. Specific chosen point is high, wide according to the practical situation.