Revit Add-ons: Electrical Panels Manager

Executive Overview

Electrical Panels Manager (EPM), published by BIM_OS, is an add-in for Autodesk Revit aimed at electrical engineers, BIM engineers, coordinators, and model authors. It centralizes electrical-panel data editing, automates recurring panel naming and rating tasks, sizes feeder cables using IEC-based methods, performs voltage-drop and short-circuit studies, and exports engineering reports without requiring the user to leave Revit. The add-in is designed to replace repetitive schedule reading and parameter entry with a single interface that reads model data, calculates results, and writes approved values back to Revit.

Panel Discovery and Data Management

Automatic panel discovery: Current product descriptions state that EPM can detect panels in the active 2D or 3D view and can switch to whole-project scanning, reducing the need for manual selection.
Centralized property editing: The interface exposes critical properties such as panel name, location, mains or bus rating, circuit-breaker rating, short-circuit rating, enclosure type, number of slots or maximum breakers, and comments.
Direct model updates: EPM reads Revit’s electrical parameters and writes edits back to the panel elements in a single transaction.
Batch processing: Multi-panel selection supports consistent edits and calculations over several panels rather than one element at a time.
Panel visualization: A Show Panel function highlights or isolates the selected panel in an appropriate view, helping users locate equipment while reviewing tabular information.
Standardized naming: Auto-naming uses user-defined prefixes, reference codes, separators, start indices, and increments. Panels can be grouped by level, zone, or location reference to align identifiers with project conventions.

Automated Ratings and Connected-Load Workflow

The Auto Calculate or Auto Assign workflow reads connected loads from Revit and uses them to propose mains and circuit-breaker ratings. Marketplace material describes an 80% design-current rule associated with IEC 60364-4-43. This can accelerate initial sizing and improve consistency across a large panel population, but the quality of the result depends on accurate Revit circuiting, load classifications, demand assumptions, supply-system data, and parameter mapping. Calculated ratings should therefore be treated as engineering outputs requiring review rather than unquestioned metadata updates.

IEC Cable Sizing

Standard basis: The integrated cable sizer is described as selecting a minimum adequate copper XLPE conductor section under IEC 60364-5-52.
Design current: Selection considers the panel’s circuit-breaker rating and the published 80% loading rule.
Installation derating: Listed installation methods include enclosed or conduit method B1, clipped-direct method C, and underground method D.
Voltage-drop calculation: For three-phase circuits, the published formula is ΔV = √3 × I × L × (R·cosφ + X·sinφ), incorporating current, route length, conductor resistance and reactance, and power factor.
Operating resistance: Marketplace documentation states that conductor resistance is evaluated at a 90°C operating temperature using IEC 60228 data.
User constraint: The user can set the maximum acceptable voltage-drop percentage.
Parallel conductors: If one cable cannot satisfy the requirement, the tool can recommend parallel conductor sets.
Results stored in Revit: Cable size and route length are written to panel shared parameters identified by the publisher as Cable_Size_IEC and Cable_Length_m.

Voltage-Drop and Fault Study

The VD & Fault Study area performs an upstream impedance analysis described as following IEC 60909-0. Published outputs include the symmetrical initial short-circuit current Ik″, peak short-circuit current ip using the κ factor, equivalent thermal short-circuit current Ith for one second, and a breakdown of source, transformer, and cable impedance. The calculation applies the IEC voltage factor, with Marketplace material citing cmax = 1.05 for low-voltage breaker sizing. It also proposes a protection type and required breaking capacity with reference to IEC 60947-2 and IEC 60898.

Reporting and Deliverables

Excel panel schedule: EPM exports an XLSX workbook containing panel loads, calculated currents, circuit-breaker and mains ratings, cable sizes, voltage-drop results, and overload flags.
Project summary: A second worksheet provides project-level totals and statistics for broader review.
PDF panel report: A formatted panel-schedule report can be generated for coordination, submittal, or client review.
PDF engineering study: Voltage-drop and short-circuit results can be issued as a separate calculation report.
Earlier descriptions: Some third-party and historical materials mention CSV export. The current Marketplace listing emphasizes XLSX and PDF, so teams should verify the exact export set in the installed release.

Practical BIM and MEP Assessment

Where It Adds Value

Model-data consistency: Batch editing and rule-based naming reduce variation in panel identifiers and ratings across schedules and views.
Reduced repetitive work: Automatic discovery, connected-load reading, sizing, and export can replace substantial manual transcription.
Model-to-calculation continuity: Engineering inputs and outputs remain associated with Revit panel elements instead of being maintained only in detached spreadsheets.
Faster QA review: Whole-project scanning, overload flags, and direct panel highlighting provide useful checkpoints for electrical and BIM reviews.
Best-fit projects: IEC-based low-voltage projects with well-developed Revit electrical systems, reliable panel connectivity, and consistent data standards.
Best-fit users: Electrical designers and engineers, BIM coordinators, and model managers responsible for panel schedules, feeder sizing, naming standards, or calculation deliverables.

Limitations and Validation Requirements

IEC-centered methodology: The cited calculations reference IEC 60364, IEC 60228, IEC 60909, IEC 60947-2, and IEC 60898. Firms working under NEC, CEC, BS 7671 amendments, local utility rules, or authority-specific practices must verify suitability and may need a different workflow.
Not a substitute for professional judgment: Suggested ratings, conductor sizes, and fault duties require review by a qualified electrical engineer and coordination with protective-device data.
Input quality governs output quality: Incomplete circuits, incorrect system voltage, missing lengths, unreliable connected loads, inappropriate demand factors, or inconsistent family parameters can invalidate results.
Shared-parameter governance: Confirm parameter GUIDs, binding categories, naming conventions, schedules, templates, and downstream data exchanges before allowing the add-in to write values to production models.
Fault-study completeness: Validate source impedance, transformer impedance and vector assumptions, conductor material and temperature, X/R ratio, fault duration, earthing arrangement, and protective-device coordination against the project basis of design.
Transaction scope: Because edits can be performed in batches and written directly to model elements, teams should test on a copy, use worksharing controls, and review changed values before synchronization.
Evidence base: Independent test data and customer reviews are limited. Publisher claims should be confirmed through a controlled pilot using known hand calculations or an approved analysis package.

Recommended Evaluation Before Production Use

Confirm the supported Revit release, current EPM version, trial terms, and subscription entitlements.
Use a copied model containing representative distribution panels, panelboards, levels, locations, connected loads, schedules, and feeder lengths.
Map EPM fields to the firm’s built-in and shared parameters; document which fields the add-in reads and writes.
Compare auto-calculated mains and breaker ratings with independently checked engineering calculations.
Test cable sizing for each intended installation method, power factor, allowable voltage drop, conductor length, and parallel-set condition.
Benchmark IEC 60909 results against a validated calculation example or the firm’s approved electrical-analysis software.
Review auto-naming for uniqueness, level and zone behavior, leading zeros, reserved identifiers, and schedule sorting.
Test batch edits and exports in a workshared model, verifying permissions, transaction behavior, schedule updates, and retained parameter values.
Review XLSX and PDF outputs for units, rounding, assumptions, revision information, warnings, and suitability for formal submissions.
Define approval responsibilities so generated values are checked and signed off by the appropriate electrical professional before issue.

Sources Consulted

Autodesk Marketplace — “Electrical Panels Manager” by BIM_OS
Osman Mohamed / BIM Guru — “Electrical Panels Manager V1.1.0” developer demonstration
Osman Mohamed — version 1.1.0 release announcement
RVT Plugins — “Review: Electrical Panels Manager Plugin for Revit”