Check Panel Schedule Arithmetic without Approving an Installation

How to Use This Tool

Recalculate VA totals, phase sums and user-entered demand factors while keeping code decisions outside the tool. Validate electrical load schedule arithmetic, recalculate connected and demand VA, compare phase totals, flag row errors, and export a review report.

The work this page finishes

A panel schedule can contain internally inconsistent multiplication or phase totals even before any code-specific demand method or installation judgment is considered. For Load Schedule Validator, keeping source order beside the computed artifact lets a user repair only the failed entries and reproduce the same batch later.

Deterministic workflow

For each valid row, multiply quantity by entered VA and demand percentage, aggregate demand VA by labeled phase, then compare active phase totals with an editable warning tolerance. For Load Schedule Validator, a run is capped at 5,000 items and 2 MB, preventing an accidental oversized paste while preserving successful rows when another row fails.

Why a dedicated interface helps

Use the report to find arithmetic and data-entry questions; a qualified designer or authority must select demand factors, phase assignment, service sizing and code treatment. For Load Schedule Validator, a purpose-built form exposes every assumption and returns the same ordered structure on every run, which is more practical than reconciling shifting conversational output.

Assumptions

• VA values and demand percentages are supplied by the user.
• A/B/C are labels, not inferred wiring.
• The imbalance threshold is a review signal only.

For Load Schedule Validator, keep an untouched copy for comparison after import; the browser performs the work locally, but local software and extensions are not controlled by this page.

Limitations and review boundary

This is not a load calculation, permit document or safety approval and does not apply NEC rules, continuous-load factors, motors, neutral effects, voltage systems or local amendments. For Load Schedule Validator, the implementation neither follows user-entered links nor evaluates their contents, and it displays material as plain text rather than active HTML.

Verification and provenance

Fixtures derived from the displayed rule and NFPA — National Electrical Code were reviewed on 2026-08-26; they include normal, empty or invalid, and partial-failure behavior. The sample recalculates three rows to 9000 connected VA and 7200 demand VA while exposing the phase spread from the entered schedule.