BNBC 2020 · Part 8 — Building Services
Appendix B — Useful Tables Relating to Conductor Sizes
Gazette pages 4954–4958 · Official gazette pages (PDF, 108 KB) — use for exact tables and figures.
Table 8.B.1: Number of Single-core Wire of Different Sizes for Various Sizes of
Metal Conduits
Conductor Cross- Conduit Diameter
sectional Area (mm2)
19 mm 25.4 31.8 38 mm 51 mm 63.5
mm mm mm
1.5 5 10 14 - - - 2.5 5 8 12 - - - 4.0 3 6 10 - - - 6.0 2 5 8 - - - 10.0 - 3 5 6 - - 16.0 - - 3 6 - - 25.0 - - 2 4 6 7 35.0 - - - 3 5 6 50.0 - - - - 4 5
Table 8.B.2: Number of Single-core Wires of Different Sizes for Various Sizes of PVC Conduits
Conductor Cross- Conduit Diameter
sectional Area (mm2) 19 mm 25 mm 32 mm 38 mm 51 mm
1.5 6 10 14 - -
2.5 5 10 14 - -
4.0 3 6 10 14 -
6.0 2 5 8 11 -
10.0 - 4 7 9 -
16.0 - 2 4 5 12
25.0 - - 2 2 6
35.0 - - 2 2 5
50.0 - - - 2 3
Table 8.B.3: Cross-sectional Area and Weight of Wire Gauges
Cross-
Weight of Weight of
Gauge System Diameter sectional
Copper Aluminium
Area
AWG SWG (mm) (mm2) (kg/km) (kg/km)
6/0 - 14.73 170.46 1515.4 460.4
5/0 - 13.11 134.92 1199.4 365.0
- 7/0 12.70 126.68 1126.2 342.1
- 6/0 11.79 109.09 969.8 294.6
4/0 - 11.68 107.22 953.2 289.4
- 5/0 10.97 94.56 840.7 255.4
3/0 - 10.41 85.16 757.2 229.6
- 4/0 10.16 81.70 720.7 219.6
- 3/0 9.449 70.12 623.4 189.4
2/0 - 9.271 67.51 600.1 182.1
- 2/0 8.839 61.36 545.5 165.7
0 - 8.255 53.52 475.8 144.4
- 0 8.230 53.19 472.9 143.6
- 1 7.620 45.60 405.4 123.1
1 - 7.341 42.22 376.2 114.5
- 2 7.010 38.60 343.1 104.2
2 - 6.553 33.94 299.8 90.80
- 3 6.401 32.18 286.1 86.89
- 4 5.893 27.27 242.5 73.63
3 - 5.817 26.57 236.2 72.01
4 - 5.182 21.09 187.5 57.11
- 6 4.877 18.68 166.1 50.44
5 - 4.623 16.78 149.2 45.25
Cross-
Weight of Weight of
Gauge System Diameter sectional
Copper Aluminium
Area
AWG SWG (mm) (mm2) (kg/km) (kg/km)
- 7 4.470 15.70 139.5 42.39
6 - 4.115 13.30 118.2 35.91
- 8 4.065 12.97 115.3 35.02
7 9 3.658 10.507 93.41 28.49
8 10 3.251 8.302 73.80 22.59
- 11 2.948 6.818 60.61 18.41
9 - 2.896 6.585 58.54 17.91
- 12 2.642 5.480 48.72 14.80
10 - 2.591 5.272 46.87 14.21
- 13 2.337 4.284 38.08 11.58
11 - 2.311 4.196 37.30 11.26
12 - 2.057 3.325 29.55 8.934
- 14 2.032 3.243 28.83 8.756
13 15 1.828 2.627 23.35 7.093
14 16 1.626 2.075 18.45 5.621
15 - 1.448 1.646 14.64 4.460
- 17 1.422 1.589 14.13 4.290
16 - 1.295 1.318 11.72 3.532
- 18 1.291 1.168 10.38 3.154
17 - 1.143 1.026 9.122 2.808
18 19 1.016 0.8107 7.207 2.223
19 20 0.9144 0.6567 5.838 1.773
20 21 0.8128 0.5189 4.613 1.401
21 - 0.7239 0.4156 3.695 1.111
Cross-
Weight of Weight of
Gauge System Diameter sectional
Copper Aluminium
Area
AWG SWG (mm) (mm2) (kg/km) (kg/km)
- 22 0.7112 0.3973 3.532 1.073
22 - 0.6428 0.3243 2.883 0.8756
- 23 0.6096 0.2919 2.595 0.7881
23 - 0.5733 0.2588 2.301 0.6990
- 24 0.5588 0.2453 2.181 0.6620
24 - 0.5105 0.2047 1.820 0.5527
- 25 0.5086 0.2021 1.797 0.5473
Source: Bangladesh National Building Code 2020, S.R.O. No. 55-Law/2020, Bangladesh Gazette (Extraordinary), 11 February 2021. Tables, figures and equations: refer to the linked gazette pages.