Blaw Knox T1521

Contents

• Overview
  • General data
• Lines
• Tower forms
  • Examples
• Tower details

Overview

T1521 is a 275 kV UK electricity pylon (steel lattice transmission tower) type designed for the North of Scotland Hydro Electric Board (NoSHEB), the operator of the non-CEB/CEGB portion of Scotland. Only a single drawing has been recovered, the key erection diagram and drawing schedule for the line tower. It is likely that the D tower is the only new tower in this contract; the remaining towers are likely to be standard L3 but this remains to be confirmed. In 1968 it was added to the standard L3 tower suite as the “DS” type; the drawing register for L3 indicates that the DS tower is “Taken from T1521”.

T1521 D is contemporary with the equivalent J L Eve enhanced L3 line tower; the corresponding L2 type is T1648. In 1967 it was included in T2175, an enhanced version of L3.

Compared to L3 D, T1521 D has greater vertical phase clearances and extended middle crossarms.

General data

Designed for	North of Scotland Hydro-Electric Board (NoSHEB)
Design contractor	Blaw Knox
Found
Height (straight line tower)	125′–0″ (38.1 m)
Voltage	275 kV
Dates back to	1960 (drawings)
Conductors	Twin
Design conductor	Twin 0.175□″ SCA
Design earthwire	?
Drawing ranges	T1521 / XM3390

Lines

Not yet known.

Tower forms

The following diagram is shown to scale at 12 pixels per metre:

Examples

No lines known.

Tower details

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