Panel Schedule Builder Guide — Permit-Ready Load Sheets

An electrical panel schedule is one of the most important documents in any permit application. It tells the inspector exactly what each circuit does, what size breaker protects it, what wire gauge carries the current, and whether the panel has capacity for the connected load. Without a clear schedule, permits are delayed and inspections fail. This guide explains how to build proper panel schedules for residential and commercial projects, with real examples and NEC-compliant calculations.

What an Electrical Panel Schedule Includes

A complete panel schedule lists every circuit breaker position with the circuit number, breaker rating and type, wire gauge, load description, connected load in volt-amperes, and the phases or poles used. Many schedules also show the busbar rating, the main breaker or main lug rating, and the total connected and demand loads. For commercial panels, the schedule may include voltage drop calculations, feeder tap information, and spare circuit provisions. The schedule is essentially a map of the entire distribution system, and inspectors use it to verify that no circuit exceeds 80% of its breaker rating for continuous loads and that the total load does not exceed the panel rating.

Real Example — 200A Residential Service

A typical 200-amp residential panel serves a 3,000-square-foot home with electric range, electric dryer, HVAC system, two bathrooms, kitchen, laundry, and general lighting. The schedule lists approximately 30 circuits. The main breaker is 200A. Two 50A 2-pole breakers serve the range and the HVAC air handler with heat pump. A 30A 2-pole breaker serves the dryer. Two 20A GFCI breakers serve the bathrooms. Two 20A AFCI breakers serve the kitchen small-appliance circuits. A 20A GFCI breaker serves the laundry. The remaining 15A and 20A breakers serve general lighting and receptacle circuits throughout the house. The total connected load might be 350A, but after applying NEC demand factors per Article 220, the demand load is approximately 160A, well within the 200A panel capacity.

Demand Factors and Load Calculations

NEC Article 220 provides the methodology for calculating service and feeder loads. The general lighting load for a dwelling unit is calculated at 3 VA per square foot. Small-appliance circuits for kitchens and laundry are calculated at 1,500 VA each. The first 3,000 VA of the lighting and appliance load is taken at 100%, then the remainder from 3,001 to 120,000 VA is taken at 35%. This is the standard lighting demand factor. For a 3,000-square-foot home with four small-appliance circuits, the lighting and appliance load is 9,000 VA plus 6,000 VA equals 15,000 VA. After demand: 3,000 plus 35% of 12,000 equals 7,200 VA. Add fixed appliances, range, dryer, and HVAC per their specific demand factors, and the total service load is typically 150 to 180 amps for a modern home. The builder handles all these calculations automatically based on NEC tables.

Real Example — Commercial Lighting Panel

A commercial office lighting panel presents different challenges. The panel is typically 208Y/120V three-phase, 42 circuits, fed from a 100A or 225A main breaker. Each circuit serves a specific zone of lighting, with connected loads calculated per NEC 220.12 and 220.14. Continuous lighting loads exceed 3 hours of operation, so the circuit must be loaded to no more than 80% of its breaker rating. A 20A breaker can only support 16A of continuous load. The schedule must flag continuous loads explicitly. For a floor with 200 LED troffer fixtures at 40 watts each, the total lighting load is 8,000 VA or about 22A per phase if balanced. Balanced phasing is critical in commercial panels to avoid neutral overload in a three-phase system, especially with LED drivers that can produce high harmonic content on the neutral.

Panel Capacity and Spare Provisions

A panel schedule must clearly show that the panel has adequate capacity for the connected and demand load without exceeding its rating. NEC 408.30 requires that panelboards be rated for the calculated load. The total calculated demand load must not exceed the panel busbar rating. Additionally, NEC 210.8 and 210.12 GFCI and AFCI requirements must be noted on the schedule so the inspector can see that each required circuit has the correct protection type. The builder flags any circuits that exceed 80% of their breaker rating for continuous loads and warns if the total demand approaches the panel rating, giving you room to adjust before submitting.

Breaker Types and Wire Gauge Selection

Each circuit entry in the schedule must specify the breaker type: standard, GFCI, AFCI, dual-function, or high-magnetic-inrush for motor loads. Wire gauge must match the breaker rating per NEC 310.16. A 15A circuit requires 14 AWG minimum. 20A requires 12 AWG. 30A requires 10 AWG. 40A requires 8 AWG. 50A requires 6 AWG. Voltage drop considerations may require larger wire for long runs, and the schedule should note when wire size is increased for voltage drop rather than ampacity. The builder includes a voltage drop calculator that adjusts wire size recommendations for runs exceeding 100 feet.

Frequently Asked Questions

What is an electrical panel schedule and why is it required for permits?

An electrical panel schedule documents every circuit in a panelboard, including breaker size, wire gauge, load description, and connected load. Permit authorities require it to verify NEC compliance, confirm the panel is not overloaded, and ensure proper overcurrent protection.

How do I calculate the total connected load for a panel schedule?

Sum the VA rating of all connected loads including lighting, receptacles, appliances, and HVAC equipment. Apply demand factors per NEC Article 220, such as the lighting demand factor for dwelling units and the optional calc for service and feeder sizing.

What is the difference between connected load and demand load?

Connected load is the total of all electrical devices installed. Demand load applies NEC demand factors to account for the fact that not all loads operate simultaneously. A panel with 50A of connected lighting might have a demand load of only 25A per NEC Table 220.42.

Can I use the panel schedule builder for multi-family or commercial projects?

Yes. The builder supports single-family, multi-family, and commercial projects. You can specify the service type as single-phase or three-phase and select the appropriate NEC demand factors for each occupancy type.

How do I indicate continuous loads on the schedule?

Continuous loads must be marked on the schedule per NEC 210.19 and 210.20. The builder allows you to flag any circuit as continuous and automatically applies the 80% derating to show the maximum permitted connected load.

Getting Your Schedule Permit-Ready

Start by entering the panel rating, voltage, and phase. Add each circuit with its breaker size, wire gauge, and load description. The builder calculates the connected load per circuit, applies demand factors based on the project type, and shows the total demand load compared to the panel rating. You can print or export the schedule as a professional PDF ready for submission. Save time, avoid calculation errors, and get your permit approved on the first submission.