Make sure the outlet on your friends house is truly on a 20 amp circuit. I stayed at my daughter's house last summer and was surprised to find that most of her outlets are on 15 amp circuits. I thought that 15 amp went out years ago but her house is only three or four years old. It is called cutting corners to cut costs. The trouble is 15 amp circuits are not really adequate to run any kind of space heater to even one of the new hair dryers that are rated at 1800 watts. I found out her neighbor's house next door is wired the same way. Of course I found all this out after popping the breakers in both houses.
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