when did they stop using aluminum wiring in ontario
mid-1970s
title: Aluminum building wiring text: Aluminum building wiring Aluminum building wiring is a type of electrical wiring for residential construction or houses that uses aluminum electrical conductors. Aluminum provides a better conductivity to weight ratio than copper, and therefore is also used for wiring power grids, including overhead power transmission lines and local power distribution lines, as well as for power wiring of some airplanes. Utility companies have used aluminum wire for electrical transmission in power grids since around the late 1800s to the early 1900s. It has cost and weight advantages over copper wires. Aluminum wire in power transmission and distribution applications is still title: Aluminum building wiring text: the preferred material today. In North American residential construction, aluminum wire was used for wiring entire houses for a short time from the 1960s to the mid-1970s during a period of high copper prices. Electrical devices (outlets, switches, lighting, fans, etc.) at the time were not designed with the particular properties of the aluminum wire being used in mind, and there were some issues related to the properties of the wire itself, making the installations with aluminum wire much more susceptible to problems. Revised manufacturing standards for both the wire and the devices were developed to reduce the problems. Existing title: Ontario electricity policy text: Ontario Power Generation (the successor of Ontario Hydro's electricity generation division) was to provide customers with a rebate for 100% of all electricity charges above that mark, retroactive to the market opening and continuing until 1 May 2006. Transmission and distribution rates were also frozen at their existing levels and would remain unchanged until 1 May 2006. The net result was a complete cessation of new investment in generation capacity and a significant cutback in new investment in transmission and distribution. In 1996, major questions arose regarding the status of Ontario's nuclear plants. The oldest of these plants built in title: Smoking in Canada text: banned smoking in public spaces and workplaces in 1994 with the passing of the "Tobacco Control Act" and became the first province to outlaw the sale of tobacco in pharmacies. This was replaced with the "Smoke Free Ontario Act" in May 2006. In 2008, a ban on retail displays of tobacco was implemented. Since 21 January 2009, smoking is banned in all vehicles if anyone under the age of 16 is present. As of 1 January 2015, smoking is prohibited province-wide on all bar and restaurant patios and within a 20-meter radius of all playgrounds and sports fields. Tobacco sales title: Ontario Hydro text: the largest) by net electrical power rating, total reactor count, and number of operational reactors. The last nuclear plant to be built in Ontario, Darlington Nuclear Generating Station, was planned in the 1970s. Construction started in 1981, but because of a series of political decision to delay construction, construction took an inordinately long time. Costs continued to mount during the delay and the plant was completed in 1993. This delay in the schedule caused the projected costs to increase tremendously, from an initial projected cost of $7.0 billion to $14.5 billion. The delay accounted for seventy percent of the cost