The current ratings are selected from tables 4 to 21 in as nzs 3008.
Cable tray sizes calculation.
Voltage drop choose the maximum percentage of the source voltage drop.
It is based on cable type insulation type and the cable installation method.
Cable tray should be perforated and 20 spare capacity.
Cable trays may be filled 50 when using control or signal wiring.
9 to begin a new calculation return to the input screen and select the clear button.
The cable sizing calculator considers solid or stranded copper conductors only.
If we select 2 runs than voltage drop is 2 8 which is within limit 5 but to use 2 runs of cable of 70 sq mm cable is not economical so it s necessary to use next higher size of cable.
Distance enter the one way length of the wires in the circuit in feet.
The sum of the diameters of all cables rated 2001 volts or over is not to exceed the cable tray width.
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.
Cable raceway tray support calculations.
2 fill in all pertinent project information.
Iii no of single conductor cables 2000 volts in the cable tray nec 392 12.
Solid bottom cable tray when using solid bottom cable tray the allowable cable area is reduced from 50 to 40.
This will clear both the input and output pages.
Calculate cable tray width calculate cable tray area calculate cable tray length calculate cable tray weight calculate remaining width of cable tray calculate remaining area of cable tray free download.
Calculate size of cable tray for following cable schedule.
It is recommended not to exceed a voltage drop of 5.
Conduit fill calculator conduit fill is the percent of area inside the conduit taken up by the cable s.
Distance between each cable is 10mm.
Cable tray is sized based on the number and type of cables required for the current and future need.
Lbs ft inside tray depth.
The sum of the cross sectional areas of all cables cannot exceed 50 of the trays fill area.
Cable id cable o d.
Per the national electrical code article nema 392 9 b cable tray fill calculations and cable tray sizing calculations will be computed as follows.
Ii no of cables more than 2100 v in the cable tray.
This is typically in a raceway cable tray or conduit in a cable burried in the earth or in open air.
Here voltage drop for 70 sq mm cable 5 8 is higher than define voltage drop 5 so either select higher size of cable or increase no of cable runs.
Cable are laying in single layer in cable tray.
Tables 4 to 21 are based on an ambient temperature of 40 c and a ground temperature of 25 c.
A 50 fill ratio should equal the maximum number of cables pulled in a given cross section.
Provides quick and easy results for the conduit fill percent per nec guidelines.
