Understanding Multiwire Branch Circuits in Home Electrical SystemsMultiwire branch circuits are an uncommon but intriguing wiring technique in home electrical systems. To the untrained eye, a panel wired with this technique may look typical, but a knowledgeable inspector should be able to spot and explain the key differences.Setting the Stage: Key Electrical ConceptsBefore diving into multiwire branch circuits, let’s review some basics:Conductor, Wire, and CableConductor: The metal (usually copper or aluminum) that carries electricity.Wire: A conductor that may be bare or covered with a plastic insulator.Cable: Two or more wires bundled together in a protective sheathing or jacket.In most homes, electrical systems use single-strand insulated copper wires bundled into 2-, 3-, or 4-wire cables. For this discussion, we’ll focus on the use of 3-wire cables.Typical Uses of 3-Wire CablesThree-wire cables are most commonly used in the following scenarios:1. 240-Volt OutletsFor appliances like stoves or dryers.The two hot wires connect to … Continued