NWE SL4

Contents

• Overview
  • General data
  • Design changes
• Can be confused with
• Tower forms
  • Examples
• Tower details

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 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:

A pair of GPO crossing towers can be found either side of Barras Brow road, Dalston, south of Carlisle. No drawings have yet been recovered for these or the terminal towers.

Examples

Out of range.

Tower details

See dimensions on the site guide page for a key to the tables.