Cable Duct Size

Title/Description:

Fill Factor ( decimal):

Cable 1 diameter (mm):

Cable 2 diameter (mm):

Cable 3 diameter (mm):

Cable 4 diameter (mm):

Cable 5 diameter (mm):

Minimum duct diameter (mm):

Tip: registered users can save calculations.

Calculate

Calculation

1. Required fill factor k

2. Cable diameter Cd, giving cable area, a:

$«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»a«/mi»«mo»=«/mo»«mfrac»«mi»$#960;«/mi»«mn»4«/mn»«/mfrac»«msup»«mi»d«/mi»«mn»2«/mn»«/msup»«/math»$

3. Cable total area Ca = sum of area for all cables

4. Minimum duct diameter Cc:

$«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»Cc«/mi»«mo»=«/mo»«msqrt»«mfrac»«mrow»«mn»4«/mn»«mi»a«/mi»«/mrow»«mi»$#960;k«/mi»«/mfrac»«/msqrt»«/math»$

Typical Cable Diameters

Following outside diameters are for reference only and will vary depending on cable manufacturer.

600/1000V XLPE Armoured

Overall Diameter (mm)
mm²	1core	2 core	3 core	4 core
1.5		12.3	12.8	13.5
2.5		13.6	14.1	15.0
4		14.7	15.3	16.4
6		16.9	16.6	18.7
10		18.0	19.5	21.1
16		20.0	21.2	22.9
25		24.1	26.7	28.9
35		27.9	29.6	32.1
50*	17.5	25.8	28.5	32.0
70	20.2	29.0	32.2	37.7
95	22.3	33.1	37.0	41.7
120	24.2	36.1	40.0	47.7
150	27.4	39.3	45.5	51.4
185	30.0	44.7	49.8	56.6
240	32.8	49.0	55.1	63.0
300	35.6	53.5	60.2	68.8
400	40.4	59.0	66.6	78.1
500	44.2
630	48.8
800	55.4
1000	60.6