V‑Drop is Windows software for calculating voltage drops on radial electric power distribution systems using the percent method of calculation. It supports single‑ and three‑phase systems, scales to studies with up to 2,000 buses and loads, and complies with NEC and NEMA standards. The program references built‑in and user‑definable X (reactance) and R (resistance) data tables, offers full‑screen input and editing with mouse support, and includes complete input error checking. It stores and retrieves input data from disk, provides comprehensive, concise reports that are manually verifiable, and allows printing to screen or printer. V‑Drop is compatible with the companion Short (short‑circuit) and Panel programs for related studies.

Key Features

NEC/NEMA‑aligned voltage drop analysis Standards compliance for design reviews.

• Complies with NEC and NEMA standards.
• Uses the percent method of calculation for traceable results.

Broad system coverage and scale From small feeders to large radial networks.

• Supports single‑ and three‑phase systems.
• Allows up to 2,000 buses and loads for large studies.

Electrical parameter libraries Accurate resistance/reactance inputs.

• References built‑in X and R values.
• User‑definable X/R data tables for custom equipment.

Usability and data management Efficient workflow and auditability.

• Full‑screen input/editing with mouse support and complete input error checking.
• Disk storage and retrieval of all input data.

Reporting and verification Deliverables ready for QA/QC.

• Provides comprehensive, concise reports that are manually verifiable.
• Ability to print on screen or printer.

Toolchain compatibility Fits into related studies.

• Compatible with the Short and Panel programs.

Benefits

Reliable, code‑consistent results Support approvals and equipment selection.

• NEC/NEMA compliance with percent‑method calculations.
• Manually verifiable reports improve review confidence.

Scales to complex projects Handle extensive distribution layouts.

• Up to 2,000 buses/loads without splitting models.
• Single‑ and three‑phase coverage across typical building systems.

Faster studies with fewer errors Improve productivity and documentation.

• Full‑screen editing, mouse support, and error checking reduce rework.
• Stored inputs and concise reports streamline revisions and submittals.