How to Map House Electrical Circuits - HomeTips For an even more thorough mapping, you can sketch a floor plan and make notes on it that identify the breaker numbers for each light and receptacle throughout the house. (Another helpful tip: Mark the back of each switch and receptacle cover with its circuit breaker number. The circuit map below is of a typical two-bedroom house. Mapping Electrical Circuits in Your Home - Copper Mapping Electrical Circuits in Your Home. March 2005. You don't have to be a professional electrician to diagram the electrical wiring in your home - but why would anyone want to do that? Actually, there are many good reasons.