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SEE SL4

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Overview

SEE SL4 was a 33 kV secondary line contract in the South-East England scheme. The towers for this contract were designed by Watsham’s around 1934.

The S10 and D10 towers are of the suspension type.

General data

Designed for CEB
Design contractor Watsham’s
Found England
Height (straight line tower) ?
Voltage 33 kV
Dates back to 1934 (drawings)
Conductors Single
Circuit count Single, double
Design conductor ?
Design earthwire ?

Progress

Diagram coverage Poor
Diagram source GA&ED
Drawings needed S3, S60, ST; D3, D30; GPO crossings; earth bars
Photo coverage Partial pending; some types no longer exist
Information needed Design conductor and earthwire

Lines

The SEE SL4 contract comprised a 33 kV ring within Essex, running between Colchester, Frinton-on-Sea, Walton-on-the-Naze and Harwich. Three extensions (a)–(c) were also recorded:

  1. Three Bridges to East Grinstead (East Sussex, illustrated here)
  2. Basingstoke to Alton, Hampshire
  3. Tee-off to Ramsgate (Kent)

Tower forms

Not all drawings have been recovered. A GPO crossing tower can be found in Wivenhoe at the junction of Colchester Road and Elmstead Road, but there is presently no drawing for this. Due to the limited number of recovered drawings, it’s not presently possible to determine whether the line towers were D3 and S3 or D2 and S2.

The following diagrams are shown to scale at 12 pixels per metre. The diagrams are only approximate due to the exceptionally poor legibility of the original drawings.

Single circuit

SEE SL4 S10
SEE SL4 S30

Double circuit

SEE SL4 D10
SEE SL4 D60
SEE SL4 D60 GPO crossing
SEE SL4 DT

The D60 GPO crossing diagram is loosely approximated according to Street View depictions of the examples in Wivenhoe and Thorrington.

Examples

None known.

Tower details

See dimensions on the site guide page for a key to the tables. The dimensions below are subject to error due to the almost unreadable dimensions on the original drawings.

Tower dimensions
Type Source Height Base width Crossarm width
Line (DC) No material recovered
D10 2264C 60′–6″ (18.4 m) 8′–6″ (2.6 m) 17′–0″ (5.2 m)
D30 No material recovered
D60 (illegible) 56′–0″ (17.1 m) 16′–0″ (4.9 m) 15′–10″ (4.8 m)
D60 GPO crossing No material recovered
DT 2288D 56′–0″ (17.1 m) 15′–0″ (4.6 m) 18′–0″ (5.5 m)
Line (SC) No material recovered
S10 2261B 54′–0″ (16.5 m) 6′–0″ (1.8 m) 13′–6″ (4.1 m)
S30 2271A 50′–0″ (15.2 m) 8′–4″ (2.5 m) 12′–6″ (3.8 m)
S60 No material recovered
ST No material recovered
Vertical spacing (double circuit)
Tower type Peak to top crossarm Top to middle crossarm Middle to bottom crossarm Bottom crossarm to ground
D3 No data
D10 4′–0″ 6′–6″ 6′–6″ 43′–6″
D30 No data
D60 4′–0″ 6′–0″ 6′–0″ 40′–0″
Vertical spacing (single circuit)
Tower type Peak to top crossarm Top to bottom crossarm Bottom crossarm to ground
S3 No data
S10 4′–0″ 6′–6″ 43′–6″
S30 4′–0″ 6′–0″ 40′–0″
S60 No data

See also