The most immediate limit on the number of circuits is the physical design of the panel box, defined by the manufacturer's specifications. A standard 200-amp residential panel typically features 30 to 42 physical slots, also referred to as spaces, where circuit breakers can be. The actual count of circuits you can install is a dynamic figure, determined by the physical limitations of the panel's design and the total electrical load drawn by the connected devices. The NEC previously regulated the maximum number of breakers an electrical panel can have, but this has changed. Clearance: Electrical panels must be installed in a readily accessible area with a minimum clearance of 30 inches (762 mm) wide, 3 ft (36 inches or 914 mm) deep, and 6. 5 feet (≈ 2 meter) high in front of the panel. The panelboard's door (hinged cover) shall be able to be opened to a full 90°. Branch circuits account for most circuits run in any electrical installation, so it pays to be familiar with the requirements. Article 210 provides the general requirements for branch circuits not over 1000V ac or 1500V dc. The electric panel's primary purpose is to safely and efficiently distribute electricity while protecting the.