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Conduit Factors and Cable Calculation with Bends

This article helps you for single core or stranded PVC insulated cables longer than 3 meter the correct factor can be found. This is an easy way to find out how many cables can be passed through a conduit pipe made of metal or PVC. The following are examples of how many cables can pass through a conduit longer than 3 meters made of metal or PVC.

Conduit Factors and Cable Calculation with Bends

Three bend conduit exceeding 3 m size calculation 

E.g. Total stranded cables is 2.5 Sq mm wire 3 Nos, 1.5 Sq mm wire 4 Nos and 1.0 Sq mm wire 4 Nos.

Stranded cable factor 
2.5 Sq mm factor - 30, 1.5 Sq mm factor - 22 and 1.0 Sq mm factor - 16. Click here to know more stranded cable factors

2.5 Sq mm wire 3 Nos = 30 x 3 = 90
1.5 Sq mm wire 3 Nos = 22 x 4 = 88
1.0 Sq mm wire 4 Nos = 16 x 4 = 64
                  Total Cable Factor = 242 

So, You will need to select a conduit factor that is larger than the total cable factor. Find from the below table of 5 m 3 bend conduit factor. we select 2 size conduit for above calculated total cable factor.

1, Three bend 5 meter 20 mm Factor = 141
2, Three bend 5 meter 25 mm Factor = 260 
 
Therefore, single 25 mm conduit or double number 20 mm conduit can be used for the above mentioned total cable factor.

i.e. 20 mm factor 141 x 2 = 282, it is greater than total cable factor (242).

PVC or Metal Conduit Exceeding 3 m Factors

The chart below can be used to find the cable factor for pipes of combined conduit sets with one or more bends. This chart is used in electrical engineering to find the exact PVC or metal conduit for conductor cable of any length or for straight runs. Look at the figure below for the wire factor of straight, one bend, two bend, three bend and four bend.

Straight Conduit Factors Exceeding 3 Meter. In the previous article, we explained about the conduit factors going in a straight up to 3 m with its calculated examples. 

Straight Conduit Factors up to 10 meter

STRAIGHT CONDUIT PIPE FACTOR EXCEEDING 3 MTR
CONDUIT 16 mm 20 mm 25 mm 32 mm
LENGTH (MTR)
1 - - - -
1.5 - - - -
2.0 - - - -
2.5 -- - -
3.0 - - - -
3.5 179 290 521 911
4.0 177 286 514 900
4.5 174 282 507 889
5.0 171 278 500 878
6.0 167 270 487 857
7.0 162 263 475 837
8.0 158 256 463 818
9.0 154 250 452 800
10 150 244 442 783

The chart above indicates a straight conduit factors greater than 3 m.


Conduit Factors with One Bend

ONE BEND CONDUIT FACTOR
CONDUIT 16 mm 20 mm 25 mm 32 mm
LENGTH (MTR)
1 188 303 543 947
1.5 182 294 528 923
2.0 177 286 514 900
2.5 171 278 500 878
3.0 167 270 487 857
3.5 162 263 475 837
4.0 158 256 463 818
4.5 154 250 452 800
5.0 150 244 442 783
6.0 143 233 422 750
7.0 136 222 404 720
8.0 130 213 388 692
9.0 125 204 373 667
10 120 196 385 643

The chart above mentions a curved conduit factors greater than 3 m.


Conduit Factors with Two Bends 

TWO BEND CONDUIT FACTOR
CONDUIT 16 mm 20 mm 25 mm 32 mm
LENGTH (MTR)
1 177 286 514 900
1.5 167 270 487 857
2.0 158 256 463 818
2.5 150 244 442 783
3.0 143 233 422 750
3.5 136 222 404 720
4.0 130 213 388 692
4.5 125 204 373 667
5.0 120 196 358 643
6.0 111 182 333 600
7.0 103 169 311 563
8.0 97 159 292 529
9.0 91 149 275 500
10 86 141 260 474

The chart above mentions the factors of conduit with two bend exceeding 3 m.


Conduit Factors with Three Bends 

THREE BEND CONDUIT FACTOR
CONDUIT 16 mm 20 mm 25 mm 32 mm
LENGTH (MTR)
1 158 256 463 818
1.5 143 233 422 750
2.0 130 213 388 692
2.5 120 196 358 643
3.0 111 182 333 600
3.5 103 169 311 563
4.0 97 159 292 529
4.5 91 149 275 500
5.0 86 141 260 474
6.0 - - - -
7.0 - - - -
8.0 - - - -
9.0 - - - -
10 - - - -

The chart above mentions the factors of conduit with three bend greater than 3 m.


Conduit Factors with Four Bends 

FOUR BEND CONDUIT FACTOR
CONDUIT 16 mm 20 mm 25 mm 32 mm
LENGTH (MTR)
1 130 213 388 692
1.5 111 182 333 600
2.0 97 159 292 529
2.5 86 141 260 474
3.0 - - - -
3.5 - - - -
4.0 - - - -
4.5 - - - -
5.0 - - - -
6.0 - - - -
7.0 - - - -
8.0 - - - -
9.0 - - - -
10 - - - -

The chart above mentions the factors of conduit with four bend up to 2.5 m.

Conclusion

I hope you have learned from this article what is the Conduit factor and cable calculation with bend exceeding 3 m. Thanks for reading this article to understand the conduit and cable capacity factor in electrical wiring. Follow us our website eeetechs4u.com for newly updated articles on electrical engineering and technology.

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