Panel Schedule Calculator

A panel schedule must include circuit numbers, circuit descriptions, connected loads in VA or watts, breaker sizes, voltage, phase assignments, and total calculated loads. It should also show the panel's main breaker rating and bus capacity.

Balance loads by distributing circuits evenly across phases A, B, and C. Aim for equal amperage on each phase within 10-15%. Single-pole breakers alternate phases, while two-pole breakers span two phases, and three-pole breakers use all three phases.

The total connected load can exceed the main breaker rating due to demand factors - not all circuits operate at full load simultaneously. However, the calculated demand load should not exceed 80% of the main breaker rating per NEC requirements.

Connected load is the sum of all individual circuit loads if they operated simultaneously. Calculated load applies NEC demand factors and diversity factors, recognizing that not all loads operate at the same time, resulting in a more realistic load estimate.

The 80% rule states that continuous loads (operating for 3+ hours) must be calculated at 125% of their actual load, and the total panel load should not exceed 80% of the panel's rating to allow for safety margin and future expansion.

Multi-wire branch circuits use a shared neutral and must be on different phases. They require handle-tied or common-trip breakers for safety. Calculate the load as the sum of both circuits, but the neutral only carries the unbalanced current.

AFCI protection is required for most 15A and 20A branch circuits in residential occupancies. GFCI protection is required in wet locations like bathrooms, kitchens, garages, and outdoors. Check current NEC requirements for your specific application and local codes.

The number of circuits depends on the panel's physical space and breaker positions. A typical residential panel has 20-42 spaces. Consider 80% loading rule, future expansion needs, and ensure adequate space for proper wire management and heat dissipation.