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Can I safely use my 1000 watt heater?


bdmowers

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Plug a light bulb into the circuit you are concerned about.  Turn on a 1000w ± hair dryer and watch the light bulb.  If your wiring is in good shape, the bulb will dim very little.  If it dims visably and stays there, you ae losing a portion of the energy into the wiring (resistive losses).  

For an analogy, and not reality, if you run the 1000w device and the voltage goes to half, then you are losing 1000w of power into the wiring of the house.  It could be lost evenly throughout the wiring which would warm it a bit but not be a problem.  But it could be a bad connection with most of the loss a point loss.  That would become a hot spot in your wall.  That could blow out the circuit, or cause a fire.  

If the light dims and you don't know how to use a volt meter, get the electrician. 

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