Cable Tray Size Calculation

December 2 2014 at 3 38 pm.

Cable tray size calculation.

Distance enter the one way length of the wires in the circuit in feet. This is typically in a raceway cable tray or conduit in a cable burried in the earth or in open air. Download cable tray and conduit sizing excel sheet free calculator for electrical design engineers to determine the size of cable tray and the wire conduits. Ignore the neutral and earth conductor in three phase cables.

Cable raceway tray support calculations. The number of cores in the cable. Distance between each cable is 10mm. Number of cable per trench is 1 number of run of cable is 1 run.

Cable tray should be perforated and 20 spare capacity. A 50 fill ratio should equal the maximum number of cables pulled in a given cross section. 7 once the calculate button has been selected the program will take you to the output page where the tray size needed will be displayed as well as the article of the nec that it falls under. What is cable tray used for.

Cable are laying in single layer in cable tray. Per the national electrical code article nema 392 9 b cable tray fill calculations and cable tray sizing calculations will be computed as follows. 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. 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. Cable trays may be filled 50 when using control or signal wiring. 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.

6 once all cable information is entered hit calculate. Select a cable size or select auto. The sum of the cross sectional areas of all cables cannot exceed 50 of the trays fill area. On tue dec 2 2014 at 7 52 pm electrical notes articles wrote.

It is recommended not to exceed a voltage drop of 5. 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. Cable tray is a bridge that allows safe transport of wires across open areas and gives protection against the overheating and fire problems.