Cable Tray Size Calculation

What is cable tray used for.

Cable tray size calculation.

An example how to calculate voltage drop and size of electrical cable photo credit. 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. 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. Select a cable size or select auto.

Calculate size of cable tray for following cable schedule. A 50 fill ratio should equal the maximum number of cables pulled in a given cross section. Cable raceway tray support calculations. Ignore the neutral and earth conductor in three phase cables.

6 once all cable information is entered hit calculate. On tue dec 2 2014 at 7 52 pm electrical notes articles wrote. This is typically in a raceway cable tray or conduit in a cable burried in the earth or in open air. Per the national electrical code article nema 392 9 b cable tray fill calculations and cable tray sizing calculations will be computed as follows.

13 responses to calculate size of cable tray excel sheet atta khan says. Cable tray is sized based on the number and type of cables required for the current and future need. Voltage drop choose the maximum percentage of the source voltage drop. The number of cores in the cable.

Cable is directed buried in ground in trench at the depth of 1 meter ground temperature is approximate 35 deg. It is recommended not to exceed a voltage drop of 5. Cable trays may be filled 50 when using control or signal wiring. Chart is based on 50 fill of 4 utp category 6 cable o d 21 033lbs ft not maximum loading weight for the tray.

December 2 2014 at 3 38 pm. Number of cable per trench is 1 number of run of cable is 1 run. Auto will automatically select the smallest cable that meets the three criteria for current rating voltage drop and fault current rating. Practical guide on the amount of cable weight that can be installed tested in accordance with nema ve 1 csa e222 2 126 1.

Distance enter the one way length of the wires in the circuit in feet. The sum of the cross sectional areas of all cables cannot exceed 50 of the trays fill area. Cable tray is a bridge that allows safe transport of wires across open areas and gives protection against the overheating and fire problems. Cable tray should be perforated and 20 spare capacity.