Duct Pipe Systems
British Standerd Telephone Duct (B.P.O)
| Size |
Minimum |
Overall Length |
Effective Length |
| OD |
Wall |
| (mm) |
(mm) |
(mm) |
(m) |
(m) |
| Duct 56 |
53.90 |
1.55 |
6.07 |
6.00 |
| Duct 54D |
96.50 |
3.25 |
6.10 |
6.00 |
BS 3506
| Normal Size |
Outside Diameter |
wall Thickness |
| Class 0 (None Pressure) |
| Averaged Value |
Individual Value |
| (Inch) |
Min.(mm) |
Max. (mm) |
(mm) |
Min. (mm) |
Max. (mm) |
| 11/2 |
48.1 |
48.4 |
2.2 |
1.8 |
2.2 |
| 2 |
60.2 |
60.5 |
2.2 |
1.8 |
2.2 |
| 3 |
88.7 |
89.1 |
2.2 |
1.8 |
2.2 |
| 4 |
114.1 |
114.5 |
2.8 |
2.3 |
2.8 |
| 6 |
168.0 |
168.5 |
3.7 |
3.1 |
3.7 |
| 8 |
218.8 |
219.4 |
3.7 |
3.1 |
3.7 |
| 10 |
272.6 |
273.4 |
3.7 |
3.1 |
3.7 |
| 12 |
323.4 |
324.3 |
3.7 |
3.1 |
3.7 |
| 16 |
405.9 |
406.9 |
4.8 |
4.1 |
4.8 |
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