Page 449 - Acel Catalogue 2021-22
P. 449
Useful Information - Cable Spacing Factors
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Cable Spacing Factors No liability can be accepted for the data below which is given for guidance only
To determine the conduit size needed, multiply the quantities of each size of cable by the appropriate factor and compare the total with the conduit figures shown. Example: What size of conduit is required for 6 No. 4mm2 cables in a 3 metre run with no bends? 6 x 58 = 348. The nearest size of conduit with a factor greater
than 348 is 20mm.
CONDUIT FACTORS
Single core PVC insulated cables
in straight runs of conduit not exceeding 3m in length
CABLE FACTORS (Exceeding 3m in length)
Single core PVC insulated cables in straight runs of conduit exceeding 3m in length or in runs of any length incorporating bends or sets
CONDUIT CAPACITY FACTORS (Exceeding 3m in length)
CABLE FACTORS
Type
Conductor cross-sectional area (mm2)
Factor
Solid
1.0
22
1.5
27
2.5
39
Stranded
1.5
31
2.5
43
4.0
58
6.0
88
10.0
146
Conduit diameter (mm)
Capacity Factor
16
290
20
460
25
800
32
1400
Type of conductor
Conductor cross-sectional area (mm2)
Factor
Solid or stranded
1.0
16
1.5
22
2.5
30
4.0
43
6.0
58
10.0
105
Length of run (m)
Conduit diameter (mm)
16
20
25
32
16
20
25
32
16
20
25
32
16
20
25
32
16
20
25
32
Straight
One bend
Two bends
Three bends
Four bends
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 6.0 7.0 8.0 9.0 10.0
- - - - - 179 177 174 171 167 162 158 154 150
- - - - - 290 286 282 278 270 263 256 250 244
- - - - - 521 514 507 500 487 475 463 452 442
- - - - - 911 900 889 878 857 837 818 800 783
188 182 177 171 167 162 158 154 150 143 136 130 125 120
303 294 286 278 270 263 256 250 244 233 222 213 204 196
543 528 514 500 487 475 463 452 442 422 40438 8
373 385
947 923 900 878 857 837 818 800 783 750 720 692 667 643
177 167 158 150 143 136 130 125 120 111 103 97 91 86
286 270 256 244 233 222 213 204 196 182 169 159 149 141
514 487 463 442 422 404 388 373 358 333 311 292 275 260
900 857 818 783 750 720 692 667 643 600 563 529 500 474
158 143 130 120 111 103 97 91 86 -
- - - -
256 233 213 196 182 169 159 149 141 -
- - - -
464 422 388 358 333 311 292 275 260 -
- - - -
818 750 692 646 600 563 529 500 474 -
- - - -
130 111 97 86 - - - - - - - - - -
213 182 159 141 -
- - -
- - - - -
388 333 292 260 -
- - -
- - - - -
692 600 529 474 -
- - -
- - - - -
CABLE CAPACITIES OF TRUNKING
To determine the trunking size needed, multiply the quantities of each cable by the appropriate factor, and compare the total with the trunking capacity figures shown. Example: What size of standard trunking is needed for 10 No. 35mm2 cables and 16 No. 4mm2 cables? (No. of cables) 10 x 95 (Factor for 35mm2 cable) = 950 The nearest size of standard trunking with a capacity factor greater than 1239.6 is 75 x 50mm (No. of cables) 16 x 18.1 (Factor for 4mm2cable) = 289.6 Total cable factor = 1239.6
STANDARD TRUNKING CABLE FACTORS
Normal conductor size mm2
1.5 solid
1.5 stranded
2.5 solid
2.5 stranded
4
6
10
16
25
35
50
70
95
Factor copper or aluminium
8.6
9.6
11.9
13.9
18.1
22.9
36.3
50.3
75.4
95
133
177
227
STANDARD TRUNKING CAPACITY FACTORS
Trunk Size
Capacity Factor
Trunk Size
Capacity Factor
50mm x 50mm
1,037
150mm x 75mm
4,743
75mm x 50mm
1,555
150mm x 100mm
6,394
75mm x 75mm
2,371
150mm x 150mm
9,697
100mm x 50mm
2,091
200mm x 100mm
8,572
100mm x 75mm
3,189
225mm x 150mm
14,652
100mm x 100mm
4,252
300mm x 150mm
19,607
For more information visit www.electric-center.co.uk
449
Section 11 - Useful Information & Index
