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L9

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Overview

L9 is a UK electricity pylon (steel lattice transmission tower) series designed by J L Eve to a 1966 specification (BES-L9-1966, Ministry of Power designation CEGB/400/L9/1966) for low-height lines. L9 is the low-height equivalent to L6 (quad 0.4″ SCA conductors carrying 400 kV). L9 is similar to L12 low-height; L12 low-height uses simple suspension insulators instead of the V-formation pairs used by L9 series.

General data

Designer J L Eve
Found England Scotland
Known subtypes L9, L9(c)
Height (straight line tower) 31.7 m
Voltage 400 kV
Dates back to 1966 (specification)
1976 (L9(c))
Conductors Quad
Circuit count Double
Design conductor Quad 0.4″ SCA (now 400 mm² Zebra ACSR)
Design earthwire 0.4″ SCA (now 400 mm² Zebra ACSR)
Normal span ?

Tower forms

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

L9 LD

Other types pending.

Tower details

Crossarm width is the total width across the widest crossarm.

Type Source Height Base width Crossarm width
L9 LD 35/5163 104′–0″ (31.7 m) 22′–0″ (6.7 m) 111′–0″ (33.9 m)
L9 LD20EC Pending
L9 LD30
L9 LD40EC
L9 LD60

See also