Built for engineers who design
complete networks
CableSpec Pro was created because modern M&E design demands more than a single-circuit tool. Accumulated voltage drop, distribution board hierarchies, selectivity between devices, and machine-readable output for BIM tools - these are the requirements that drove the Pro platform.
Industry-specific
Every feature is built specifically for BS7671 cable sizing work. No generic tooling, no compromise - a rigorous, complete implementation of the Appendix 4 methodology extended to the full distribution network.
Standards-referenced
CableSpec Pro follows BS7671:2018+A4:2026 Appendix 4 throughout - every check, every correction factor, the reactive VD formula, the Reg 433.1.201–204 overload rules, disconnection times, accumulated VD per §6.4, and selectivity per Reg 536.4.
Audit-ready output
Every calculation produces a professional PDF certificate showing all inputs, correction factors, check results and engineer details - giving clients and inspectors everything they need without additional documentation.
Professional BS7671 distribution network design
CableSpec Pro is a cloud-based SaaS application purpose-built for BS7671:2018+A4:2026 cable sizing on complex, multi-board installations. It gives M&E design offices and large contractors the complete distribution network workflow - from supply origin through main boards and sub-mains to every final circuit - with all the documentation a major project requires.
Where base CableSpec excels at single-circuit calculations, CableSpec Pro adds the distribution network dimension: boards with feeding relationships, accumulated voltage drop tracked from origin, selectivity checks between each circuit and the device feeding it, and bulk import from BIM or spreadsheet exports via Excel, or circuit by circuit through the REST API. Every Pro feature is built on the same rigorous Appendix 4 engine, extended to understand the full network context of each circuit.
- Every Appendix 4 check per circuit - all automated
- Distribution network hierarchy: boards, sub-mains, final circuits
- Accumulated VD from origin per BS7671 Appendix 4 §6.4
- Selectivity advisory per Reg 536.4 - energy and current checks
- Bulk circuit import from Excel - up to 500 circuits in one step
- Auto-generated single-line network diagram - SVG and PDF A3
- REST API with scoped bearer token auth - Revit & Power Automate ready
- Complete version history on every circuit - timestamped, attributed
Specialist software, built from inside the industry
Construct Software is a specialist software development company whose entire product portfolio is focused on the UK electrical contracting and building services sector. Every tool we build addresses specific technical, regulatory and operational challenges that electrical professionals face day to day.
We develop in close partnership with leading electrical contractors - including Darke & Taylor Ltd, a leading MEP contractor in the south-east of England - ensuring that our products are shaped by real-world design and compliance practice rather than theoretical assumptions. Our team understands BS 7671 Appendix 4, BS 7909, IET Codes of Practice, and the daily realities of managing electrical compliance across commercial, industrial and residential projects.
More tools from Construct Software
CableSpec Pro is one part of a broader ecosystem of specialist software products. Each is independently useful - together they cover the full breadth of electrical engineering, compliance and contracting work.
SafetyCert
Cloud-based compliance management for MEP contractors - PAT testing, Minor Works, EICRs, document management and live compliance dashboards across sites and buildings.
- PAT testing with asset registers and session locking
- Minor Works certificates to BS 7671
- EICR tracking with C1/C2/C3/FI observations
- Multi-site compliance dashboard and expiry alerts
ElectraCert
Produce compliant Electrical Installation Certificates, Minor Works Certificates and Condition Reports to the latest wiring regulations.
- EIC, MEIWC and EICR certificate production
- Compliant with BS 7671:2018+A4:2026
- Schedule of inspections and test results
- PDF generation and client distribution
InterimReport
Interim building condition reports for any building — commercial, public and residential. Offline mobile app, GPS-stamped evidence, locked PDF reports and secure client share links.
- Template library plus fully custom templates
- Locked and timestamped PDF report output
- Secure client share link with expiry control
- Re-inspection reminder email scheduling
ContractorCompliance
Manage contractor insurances, qualifications and certifications, with a self-service portal for contractors to maintain their own credentials in real time.
- Insurance and certification expiry tracking
- Contractor self-service upload portal
- Accreditation scheme verification (NICEIC, NAPIT, ECA)
- Compliance status dashboard for procurement teams
FacilitiesMaster
A comprehensive FM platform for managing assets, PPM schedules, reactive jobs, contractors and compliance documentation across property portfolios.
- Asset register and lifecycle management
- PPM scheduling and job tracking
- Contractor management and attendance records
- Multi-site portfolio management
TESCert
Purpose-built for events, media and entertainment - produces BS 7909 temporary electrical system certificates with full inspection records and PDF output.
- BS 7909 certificate production
- Inspection and test record management
- PDF certificates with digital signatures
- Designed for events and live production
Ready to use CableSpec Pro?
Contact us to request a demonstration and we'll walk you through the full distribution network workflow. Already a Construct Software customer? Request pricing, order your licence then access CableSpec Pro directly from the Start dashboard.