Cable Tray Size Calculation

What is cable tray used for.

Cable tray size calculation.

Distance between each cable is 10mm. Cable are laying in single layer in cable tray. Cable trays may be filled 50 when using control or signal wiring. 1 2 no s of 3 5cx300 sq mm xlpe cable having 59 7mm outer diameter and 5 9 kg meter weight 2 2 no s of 3 5cx400 sq mm.

This is typically in a raceway cable tray or conduit in a cable burried in the earth or in open air. A 50 fill ratio should equal the maximum number of cables pulled in a given cross section. The number of cores in the cable. Select a cable size or select auto.

Cable raceway tray support calculations. Distance enter the one way length of the wires in the circuit in feet. Cable tray is a bridge that allows safe transport of wires across open areas and gives protection against the overheating and fire problems. Calculate size of cable tray for following cable schedule.

Auto will automatically select the smallest cable that meets the three criteria for current rating voltage drop and fault current rating. Number of cable per trench is 1 number of run of cable is 1 run. Cable tray should be perforated and 20 spare capacity. Cable is directed buried in ground in trench at the depth of 1 meter ground temperature is approximate 35 deg.

Cable tray is sized based on the number and type of cables required for the current and future need. On tue dec 2 2014 at 7 52 pm electrical notes articles wrote. Practical guide on the amount of cable weight that can be installed tested in accordance with nema ve 1 csa e222 2 126 1. Chart is based on 50 fill of 4 utp category 6 cable o d 21 033lbs ft not maximum loading weight for the tray.

Ignore the neutral and earth conductor in three phase cables. Per the national electrical code article nema 392 9 b cable tray fill calculations and cable tray sizing calculations will be computed as follows. Voltage drop choose the maximum percentage of the source voltage drop. It is recommended not to exceed a voltage drop of 5.

December 2 2014 at 3 38 pm. 6 once all cable information is entered hit calculate. 13 responses to calculate size of cable tray excel sheet atta khan says. An example how to calculate voltage drop and size of electrical cable photo credit.