Pylon schemes

Contents

• Overview
• Primary Lines
• Secondary Lines

Overview

This page is not a catalogue of all lines and schemes, just those schemes that have a name. Not sure what this page is for but it had to be split out from the series page as part of disentangling the confusion between scheme designations and tower suite designations. The entries are only in the vaguest hint of a meaningful order, as virtually nothing is known about any of these schemes.

See the regions page for a guide to the regions and their abbreviations.

Primary Lines

Original CEB/CEGB PL schemes, plus later schemes of 132 kV and above.

The Watshams SEE PL7 tower drawings are variously annotated with the identities of other schemes, but no other scheme appears on all of them. Thus, without inspecting each one individually it’s not clear to what extent they re-used the SEE PL7 towers. Hence “Watshams?” below. (There are other Watshams tower types but only one 132 kV type is known; the others were for secondary lines.)

The only known SWE PL1(a)&(b) drawings are for a Callender’s S2 tower and date to 1931. Extant lines use this S2 type in conjunction with revised Milliken (SS PL1) angle towers, as well as Milliken S10 standing in for S2. Whether this scheme used double circuit anywhere remains a mystery.

Secondary Lines

33 kV and 66 kV on lattice towers, mistakenly referred to as “pre-Grid” towers. Tower diagrams pending some way to name the different tower types on this site.