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10A running through 10' of #12 AWG copper Romex should give you a max 320 mV drop in voltage when the 10A load is switched on. This is 1.6 milliohms per foot for copper (~2.5 for aluminum of the same gauge) with 20' loop distance.
Run the numbers based on your distances and conductor material and decide if your sump pump amperage with good wiring and connections can account for the voltage dropoff you are seeing.
Pump startup amps might be 6x the steady-state value.
I'd think CFLs with their built-in electronic power supplies are way less sensitive to input voltage variation than are incandescents.
Run the numbers based on your distances and conductor material and decide if your sump pump amperage with good wiring and connections can account for the voltage dropoff you are seeing.
Pump startup amps might be 6x the steady-state value.
I'd think CFLs with their built-in electronic power supplies are way less sensitive to input voltage variation than are incandescents.