How to Wire a Simple 120v Electrical Circuit (with Pictures) MethodTipsWarningsThings Needed Turn off the power feeding the panel you are going to be working in. It may help to take a few minutes to familiarize yourself with all of the tips in the related wikiHow article on "How to Master Do It Yourself Electrical Safety". Shut off all the individual circuit breakers in the panel and then shut off the main switch that supplies power to the panel. This is preferable as it is much This wikiHow is about wiring a simple electrical circuit. It doesn't cover the following information, whiSee all 37 steps on wwwhow75%(72)Published: Views: 468K Wiring Diagrams - OutBack Power Inc OutBack Power, headquartered in Arlington, Washington and is the leading designer and manufacturer of advanced power electronics for renewable energy, back-up power and mobile applications. The Company is also a member of The Alpha Technologies -- a global alliance of companies that share a common philosophy: create world-class powering Light Switch Wiring - Electrical 101 With alternate light switch wiring, an NM cable supplies line voltage from the electrical panel to a light fixture outlet box. Another NM cable connects from the light fixture box to the switch box. In the diagram below right, a 2- wire NM cable that connects the light fixture to the switch carries 2 line wires (one line, and one switched line).