What Information Belongs on an Electrical Panel Schedule?

An electrical panel schedule lists every circuit in a panelboard: circuit number, description of the load served, connected and demand load (volt-amperes), breaker size and poles, wire size and type, and conduit size. The schedule also shows the panel's voltage, phase, bus rating, main breaker, and total connected and demand loads — which feed the service load calculation. Engineers produce panel schedules for every panelboard and switchboard on the project as part of the permit documents. The discipline the schedule enforces is traceability. Every load on the building should be findable on exactly one schedule, and every schedule should foot to the feeder and service calculations. When those numbers don't reconcile, something's missing — and finding it in design is free compared to finding it in the field.

It starts with honest loads: real equipment ratings from the mechanical schedules and equipment cuts, receptacle and lighting loads per the NEC's rules, and specialty loads (kitchens, IT, EV charging) with their actual demands. Each circuit gets a clear description — 'receptacles, open office north' beats 'REC-1' — because the schedule is a permanent operations document, not just a permit artifact. Breaker and wire sizing follow the load with the NEC's protection and conductor rules, including continuous-load factors where they apply. Multi-wire branch circuits, dedicated neutrals for nonlinear loads, and AFCI/GFCI requirements all get documented per circuit. The panel header carries the infrastructure facts: voltage and phase, bus ampacity, AIC rating coordinated with the available fault current, and main breaker size. When the plan checker can trace service to feeder to branch without asking questions, the schedule did its job.

Schedules look like paperwork until they're wrong — then they're the reason a panel melts a bus or a permit stalls for weeks. Mistakes I check for on every schedule:

• Placeholder loads: round numbers that were never replaced with actual equipment ratings
• Math that doesn't foot: circuit loads that don't add to the panel total feeding the service calc
• Missing demand factors: connected load used where the code requires demand load, oversizing everything
• Vague descriptions: circuit labels nobody can trace, turning future work into archaeology
• No spare capacity: panels designed full on day one with no room for the building's future