East Sussex/Kent

[yv47r]

The L2 D? tower in images #152 and #114 is one of the rarer types of L2 towers. It appears to be based upon the L2 D60 deviation tower but the towers in your photos have square ended cross arms on each side.

Closer inspection of the tower in image #152 shows that it has square ended crossarms on both sides - note symmetry of the downward crossarm angles and ^-^ tower peak whereas the tower in #114 also has square ended cross arms on each side but has a pyramid tower peak.

Any explaination for the two different tower peak types? Over to you Dr Fortran...

[Flash Bristow]

I did ask someone about the two peaks, I vaguelly recall that it was tried out but turned out not to be better than a single peak so they went back to using one? Does anyone know different?

(I much prefer the look of the twin peaks though!)

[naughtyhorse]

Hiya,

re the question of quad to triple - grid have a 400kv line crossing one of my rebuilds in norfolk and they are planning to replace the quad..... zebra (400 sq mm) I think. with triple aricaria (750sq mm?). which i think is a copy of the REC/DNO's trick of replacing ACSR (Aluminium Conductor Steel Reinforcement) with a thicker, but lighter AAAC (All Aluminium Alloy Conductor)with a higher capacity - with the recs it was upas replacing lynx. the wire is lighter per metre, but as it is thicker the loading from ice and wind increases. You get a lot more capacity for not a lot more load. however as tower design is usually pretty finely balanced, there is often not a lot of spare capacity (not counting factors of safety) so at 132 you can usually replace linx on an L7(c) or PL16 circuit with the beefier towers - but not a L4M