L9
Contents
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 |
|
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:
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
- L6 and L9, Gloucester (Flickr album)
- L9 LD (Flickr)
- L9 angle tower (Flickr)
- L9 angle tower, alternative angle (Flickr)