Everyone on here probably knows the three ways a standard wall outlet receptacle can be wired: rear insert, or, "back stab", side screw, or "pressure plate"(where you insert the wire in the rear and tighten it with sidescrews.
What I would like to know is if the resistance and efficiency of each method has been tested and documented under various load levels.
I am asking this only because in spring of '05 I rewired most of the outlets in my apartment, built in 1969. They were of the spring- loaded backstab method, so I cut down to clean wire and wrapped the conductors around the sidescrews in each case.
I did this for three kitchen outlets on the same branch, controlling a toaster, microwave, and refrigerator. I also replaced most of the outlets in the living and bedroom areas.
Kid you not - my electric bills for April-Sept 2006 were lower than those for the same period in 2005 - albeit lower in terms of average kWh per day than in actual dollars on the bill. Our utility rates have gone up 26% since '05 so the savings in dollars is not proportionate to the decrease in kWh used.
This year the avg. kW hours per day were even lower from April - Sept, though the actual dollar amount of the bills have been about the same. Again, part of that rate increase that was imposed over a long time period.
I sincerely believe that switching all those receptacles from back- stab to side-screw, and one of them(which I broke!) to back pressure plate, played at least a *small* part in increasing the efficiency of our electrical consumption.
I know there is more contact area between the receptacle and the conductor using side screw VS using back-stab(single point grab), so it would seem to make sense that my electricity is going more efficiently to where it is needed, rather than wasted as excess heat.
Opinions? Conclusions?
-ChrisCoaster