Similarly, a flicker could occur when a load is activated unexpectedly. Sometimes an appliance with rotary components has a bearing failure, which can cause the motor to work harder on startup, drawing more current and causing a noticeable light flicker. The better the design of your electrical system, the less noticeable the flicker will be, but it will still be there. Since your main supply wires have some resistance, you will still get some flicker even when these loads are on different circuits. For example, large loads (washing machines, refrigerators, etc.) should be on their own 240V circuits. With a properly designed electrical system, you can minimize flickers but not fully eliminate them. On startup, they will cause a significant voltage drop in the supply.įlickers of this nature are inevitable. Many loads have inrush current, which draws a lot more current when first turned on. If you have loads that turn on and off, like lights, then the voltage supplying your lights will change, and a flicker will occur.
This means that when the current reaches a destination, there is slightly less voltage for your various loads (lights, toaster, etc.). All wires have a level of natural resistance, meaning that when electric current flows through them, some amount of voltage gets used to force the current flow against the wire's resistance.
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