NWE SL4
Contents
Overview
NWE SL4 is distribution tower series designed by Blaw Knox. Whether any other lines use this same tower type is not known.
General data
| Design contractor | Blaw Knox, Milliken Brothers branch |
|---|---|
| Height (straight line tower) | 68′–9″ (21.0 m) |
| Voltage | 66 kV |
| Dates back to | 1935 (drawings) |
| Known conductors | Single |
| Design conductor | ? |
| Circuit count | Double |
Design changes
The original line tower had 8′–6″ crossarm spacing and a pyramid peak; this design was cancelled in favour of a wedge-peak design with 10′–6″ crossarm spacing. A D3°L type with reduced crossarm spacing of 9′–0″ was also cancelled.
The D10 tower was originally designed as a suspension tower. It was redesigned as a tension tower, with the original design cancelled. The cancelled version had 8′–6″ crossarm spacing; the final design has 10′–6″ spacing. The original D30 likewise had 8′–6″ crossarm spacing; the final design has 10′–6″ spacing.
Can be confused with
- Baby PL16 (66 kV?)
- ca. 1945 standard 66 kV
- Blaw Knox K9906
Tower forms
The following diagrams are shown to scale at 12 pixels per metre:
Examples
Out of range.
Tower details
| Type | Source | Height | Base width | Overall width |
|---|---|---|---|---|
| D3 | XM1266-23A | 68′–9″ (21.0 m) | 8′–6″ (2.6 m) | 18′–0″ (5.5 m) |
| D10 | XM1266-24A | 68′–0″ (20.7 m) | 10′–0″ (3.0 m) | 19′–0″ (5.8 m) |
| D30 | XM1266-26 | 68′–0″ (20.7 m) | 14′–3″ (4.3 m) | 19′–6″ (5.9 m) |
| D60 | XM1266-25 | 68′–0″ (20.7 m) | 16′–3″ (5.0 m) | 21′–6″ (6.6 m) |
| Tower type | Peak to top crossarm | Top to middle crossarm | Middle to bottom crossarm | Bottom crossarm to ground |
|---|---|---|---|---|
| Line | 4′–0″ | 10′–6″ | 10′–6″ | 43′–9″ |
| Angle | 7′–0″ | 10′–6″ | 10′–6″ | 40′–0″ |