Amid the heat, street cars have also been hindered by sagging overhead wires and power issues, according to a statement from Portland Streetcar. TriMet's regional MAX light rail system also suspended service due to similar issues with overhead wires and extreme heat.
Heat-related expansion caused road pavement to buckle or pop loose in many areas, including on Interstate 5 in Seattle.
Workers in tanker trucks in Seattle were hosing down drawbridges with water at least twice a day to prevent the steel from expanding in the heat and interfering with their opening and closing mechanisms.
Seattle's average high temperature in June is around 70, and fewer than half of the city's residents have air conditioning, according to U.S. Census data.
https://www.sfgate.com/weather/article/Portland-streetcar-power-cables-melt-heat-wave-16281482.php
the power lines were built with no margin for a minor temperature variation it looks like to me.
Like the idiot who decided what insulation was going to get selected for this application was not taking the extremely dangerous power lines as a place to be a lot more safety minded when selecting the insulation.
Almost all of your powerlines are bare stranded aluminum. It would cost a fortune to insulate them and bury them. That's why they're up in the air. I always wondered why they didn't bury the new installations.
ReplyDeleteCost and automobiles.
Delete