What causes lights to dim?
If your lights dim when an appliance (fridge, air cond, etc.) comes on, check to see if the lights are on the same circuit with the appliance. Most fixed appliances (fridge, air cond, etc.) should be on a dedicated circuit back to the main panel. These devices draw quite a bit of current in the first second or so when they first start up. If all the lights in your house are dim all the time or periodically, the problem could be at the local utilities substation, transformer or their service feed coming into your house. This is one of the first thing you might want to have checked. Your lights could dim if the wiring in your house is not large enough, it will have too much resistance. When a large current is present in the wire, there will be a significant voltage drop, leaving less voltage available to your lights. If the light in your house dim and also get brighter it could indicate a lot more serious problem, a loose, broken or corroded neutral wire. Electricity is usually delivered
