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Questions about number of devices, kinds of devices allowed, ampacities, etc. in Additions, garages, conversions. Home branch circuit wiring is a crucial part of any electrical system, designed to supply power to various devices and outlets within a residence. Each branch circuit consists of a loop of wire that runs from the circuit breaker panel to the lights, receptacles, and appliances, and back again. These circuits are classified into different types based on their function: General Purpose Branch Circuits: These circuits supply power to light fixtures and outlets. Modern general circuits use 12-gauge wire and are rated for a maximum of 20 amperes (amps). They are typically 120 volts and are used for standard outlets and lighting fixtures. Appliance Branch Circuits: These circuits supply power to fixed electrical devices such as refrigerators, washing machines, and dishwashers. They are also rated at 120 volts but can have higher-capacity 20-amp breakers and 12-AWG wiring. These circuits are usually installed in kitchens, bathrooms, and laundry areas. Individual Branch Circuits: These circuits supply power to a specific device, usually a permanent appliance like a clothes dryer or an electric stove. They are often 240 volts and require larger wires to handle the higher amperage. Multiwire Branch Circuits (MWBCs): This is a unique wiring technique where a single cable serves two circuits, each with a voltage between them and sharing a common neutral wire. This method reduces clutter and simplifies the panel's wiring. However, it requires careful maintenance and should be managed by a certified electrician.

A number of wire sizes and types are needed to wire homes. Non-metallic sheath cable, often referred to as NM cable, is a type of electrical wiring commonly used in residential and light commercial construction. It consists of individual insulated wires bundled together and covered by a non-metallic outer sheath, typically made of PVC. This sheathing is designed to be flame-resistant and moisture-resistant. NM cable is available in various configurations, with the number of insulated wires and their gauges indicated on the sheath. For example, "12-2" indicates a cable with two insulated 12-gauge wires plus a bare ground wire. The color of the sheath can indicate the gauge of the wires or special properties of the sheathing itself. NM cable is easier to handle and install compared to metal-sheathed cables like BX cable. It is lightweight, easy to cut, rip, and strip, and can be pulled effortlessly through holes in studs. However, NM cable must always be installed in enclosed locations such as within walls, ceilings, or under floors, and it requires a separate grounding wire. In contrast, metal-sheathed cables like BX offer stronger protection but are heavier and more difficult to work with. They can achieve grounding through the outer metal casing, which needs to be attached to metal boxes.