Commercial Electrical Toolkit is a professional reference and project-management tool built for electrical engineers, project managers, and construction teams on commercial distribution projects. WHAT'S INSIDE Four Professional NEC Calculators Voltage Drop — calculates conductor voltage drop per NEC guidelines with pass/fail against the 3% recommendation. Supports copper and aluminum conductors from #14 AWG to 500 kcmil, single-phase and three-phase systems. Conduit Fill — checks NEC Chapter 9 Table 1 fill limits for EMT conduit (½" through 4") with THHN/THWN-2 wire sizes up to 350 kcmil. Supports up to three wire sets in one raceway. Demand Load — estimates service entrance amperage using NEC Article 220 demand factors for lighting, receptacles, HVAC, motors, and miscellaneous loads. Automatically identifies the next standard ampere rating per NEC 230.79. Fault Current — calculates available short-circuit current at the transformer secondary using IEEE C37.010 inputs. Includes asymmetrical peak current factor, X/R ratio, and PPE category guidance. 42-Drawing Engineering Reference Library Full-resolution reference drawings spanning all 17 phases of a commercial electrical distribution project — from utility coordination through project closeout. Drawings are searchable, filterable by phase, and open in a full-screen zoomable viewer. 17-Phase Workflow Tracker Track a complete commercial electrical distribution project from utility coordination through project closeout. Each phase contains detailed steps with professional descriptions, deliverables, and completion tracking backed by SwiftData persistent storage. Deliverables & Document Manager Monitor drawing submittals, calculation packages, equipment schedules, and closeout documents with real-time completion status. Color-coded indicators show at a glance what is pending, in review, or approved. Arc Flash & Fault Current Guidance Estimate available short-circuit current at the transformer secondary and evaluate PPE requirements using IEEE 1584 and IEEE C37.010 inputs. All results include a clear disclaimer directing users to a licensed engineer for a full arc flash study per NFPA 70E. Who It's For Electrical engineers managing commercial distribution design packages Project engineers and project managers on construction sites Electrical contractors coordinating multi-phase commercial projects Apprentices and students preparing for professional practice All NEC formulas reference the National Electrical Code. All fault current calculations are informational estimates; a licensed professional engineer should perform the full short-circuit and arc flash study for any real installation.
