Hello! This is a separate big question, to which we will write a detailed article. If in general - you need to work when the power is off, use protected electrical appliances and tools, know the rules of electrical safety and first aid for electric shock. Separately by points, we dealt with most of the issues in the categories of electricity and safety, here is the link https://our.electricianexp.com/en/, we recommend that you familiarize yourself!
Hello! This is a separate big question, to which we will write a detailed article. If in general - you need to work when the power is off, use protected electrical appliances and tools, know the rules of electrical safety and first aid for electric shock. Separately by points, we dealt with most of the issues in the categories of electricity and safety, here is the link https://our.electricianexp.com/en/, we recommend that you familiarize yourself!