Electrical Wiring Devices | Legrand FROM BIG IDEAS TO THE SMALLEST DETAILS, YOUR JOBS WILL BE COVERED WITH ELECTRICAL WIRING DEVICES BY LEGRAND. Legrand provides the most complete line of residential, commercial and industrial electrical wiring devices in the world.Electrical Receptacles · Wall Plates · Electrical Switches · Boxes · GFCI · Outdoor Charging Basic House Wiring -Connections and Code Most circuits and devices in a home are rated as 15-amp or 20-amp. What this means varies a bit from one item to another. In a way, it all starts with the size of the wire. 14-gauge wire is the smallest allowed for the permanent wiring of a circuit.