Cable Tray Size Calculation

The sum of the cross sectional areas of all cables cannot exceed 50 of the trays fill area.

Cable tray size calculation.

It is recommended not to exceed a voltage drop of 5. Auto will automatically select the smallest cable that meets the three criteria for current rating voltage drop and fault current rating. 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.

December 2 2014 at 3 38 pm. Distance enter the one way length of the wires in the circuit in feet. Chart is based on 50 fill of 4 utp category 6 cable o d 21 033lbs ft not maximum loading weight for the tray. 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.

On tue dec 2 2014 at 7 52 pm electrical notes articles wrote. What is cable tray used for. The number of cores in the cable. Distance between each cable is 10mm.

An example how to calculate voltage drop and size of electrical cable photo credit. Cable raceway tray support calculations. Cable trays may be filled 50 when using control or signal wiring. 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.

6 once all cable information is entered hit calculate. Cable is directed buried in ground in trench at the depth of 1 meter ground temperature is approximate 35 deg. This is typically in a raceway cable tray or conduit in a cable burried in the earth or in open air. Select a cable size or select auto.

13 responses to calculate size of cable tray excel sheet atta khan says. Per the national electrical code article nema 392 9 b cable tray fill calculations and cable tray sizing calculations will be computed as follows. Calculate size of cable tray for following cable schedule. Number of cable per trench is 1 number of run of cable is 1 run.

Voltage drop choose the maximum percentage of the source voltage drop. Ignore the neutral and earth conductor in three phase cables. Cable tray is sized based on the number and type of cables required for the current and future need. Cable tray is a bridge that allows safe transport of wires across open areas and gives protection against the overheating and fire problems.