Cable Duct Size Calculator

Here is the online cable duct size calculator to calculate the minimum duct diameter using the duct diameters and fill factor in percentage. The fill factor or the conduit fill is the percentage of area inside the conduit, occupied by the cables. Minimum duct diameter calculation is done based on the diameters and fill factor. The duct is a conduit or a passage used for air flow. The air flow in ducts vary according to the diameter, fill factor, etc.

Minimum Duct Diameter Calculation

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Here is the online cable duct size calculator to calculate the minimum duct diameter using the duct diameters and fill factor in percentage. The fill factor or the conduit fill is the percentage of area inside the conduit, occupied by the cables. Minimum duct diameter calculation is done based on the diameters and fill factor. The duct is a conduit or a passage used for air flow. The air flow in ducts vary according to the diameter, fill factor, etc.

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Formula:

Minimum Duct Diameter = √((4 × ((π/4)*(d1²+d2²+d3²+d4²+d5²))) / (π × k/100)) Where, d1= Diameter of Cable 1 d2=Diameter of Cable 2 d3= Diameter of Cable 3 d4= Diameter of Cable 4 d5= Diameter of Cable 5 k = Fill Factor

Example:

Find minimum duct diameter for combination of 5 cables.Its diameter are 3 mm,2 mm,4 mm,5mm and 1 mm respectively and fill factor is 3%.

Solution:

Minimum Duct Diameter=√((4 × ((π/4) × (32+22+42+52+12)))/(π × 3/100))
=√((4 × ((π/4) × (9+4+16+25+1)))/(π × 0.03))
=√((4 × ((π/4) × (55)))/(π × 0.03))
= 42.8174 mm

In this cable duct size calculator, enter values for diameter 1 through diameter 5 and fill factor to find the minimum duct diameter. You can find the result in different measurements such as mm, cm, m and so on as you wish.


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