On 09/07/2019 00:21, Greg Robinson wrote:
> Judging by what I have seen in Dandenong Rd and PallMall in Bendigo the centre poles seem to last about 100 years.

>

I'm sure that proximity to salt water reduces the lifespan.  The pole pictured in the attached image had to be removed due to corrosion at the base not long after I made the pic.

Original poles were painted (usually with am aluminium paint) but not otherwise treated for corrosion resistance.  Modern poles are galvanised steel.

I doubt that electrolysis would play a part; no-one with any sense would allow a 'hot pole' to stay in use.

Mal Rowe - by the sea in Saanich