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Not to mention "Oh look at all that loverly expensive copper wire up there"Vjkdigital wrote:Is the substation even finished yet!?
Surely they wouldn't be installing wires (as much of it its even up yet) while the system is live, as we don't even have any trains to run under them. Trains won't be fitted out when they arrive anyway.
Suspect this is just a "always treat wires as live" lesson.
Snip!rubberman wrote:Not to mention "Oh look at all that loverly expensive copper wire up there"Vjkdigital wrote:Is the substation even finished yet!?
Surely they wouldn't be installing wires (as much of it its even up yet) while the system is live, as we don't even have any trains to run under them. Trains won't be fitted out when they arrive anyway.
Suspect this is just a "always treat wires as live" lesson.
Copper or aluminim?rubberman wrote:Not to mention "Oh look at all that loverly expensive copper wire up there"
Actually, probably a copper alloy.monotonehell wrote:Copper or aluminim?rubberman wrote:Not to mention "Oh look at all that loverly expensive copper wire up there"
I would like to know now. I've Googled till my fingers hurt. Many articles about them. None of them mention composition.rubberman wrote:Actually, probably a copper alloy.monotonehell wrote:Copper or aluminim?rubberman wrote:Not to mention "Oh look at all that loverly expensive copper wire up there"
Aluminium is way too soft and would wear out in no time. Using the Al for the catenary would not work either as there would be some really great corrosion at the joints.
Finally found something that looks authorative that states what you guys have said.Aidan wrote:I'd expect it to be pure copper, as alloying increases the electrical resistance. A graphite contact surface on the pantograph means aluminium could be used, but you'd need more of it, which would make it heavier and the extra cost of supporting it would negate the savings of the cheaper material.
I'm a Sparky by trade. I believe you can find wire specs via ASTM or similarmonotonehell wrote:I would like to know now. I've Googled till my fingers hurt. Many articles about them. None of them mention composition.
probably more of a focus on 'strength' and 'sustainability' rather than conductability.New Seaford rail bridge needing repairs on extension joints
THE Seaford rail bridge, which is part of a $291 million Noarlunga line extension, already needs repairs before train services can begin.
It's feared the repair work will delay the opening of the 5.2km Seaford rails extension, due to be completed early next year, after the discovery of problems with its expansion joints.
The State Government said there was a "manufacturing issue'' with the joints on the 1.2km long bridge, which spans the Onkaparinga River Valley.
When quizzed about the problem at budget estimates hearings in Parliament this afternoon Transport Minister Tom Koutsantonis revealed the "issue'' with the joints.
"Before services even commence, obviously, the bridge goes through a commissioning stage and that commissioning stage has found some things to be remedied,'' he said in answer to questions by Opposition transport spokeswoman Vickie Chapman.
"As part of the contract the contractor is completing them and remedying the problems and delivering it to the Government in an acceptable state.''
In responding to Ms Chapman's questions the minister admitted "this is the first I have heard of any deficiency''.
Ms Chapman said there had already been a delay in the original beginning of services "which the Government previously promised would happen in 2013''.
"This latest development raises concerns about electric rail services commencing by the beginning of next year," Ms Chapman said.