Cable Duct Sizing Calculator
Size and coordinate underground ducts for power cables. Set ownership (DNO, IDNO or private), the formation and the clearances, and the tool returns the duct size, number of ducts, cover depth, spacing and colour, with a coordination drawing and a BS 7671 depth and grouping design record.
v3.7.4 · Verified BS 7671:2018+A4:2026, Appendix 4 (Ref Method D) Open the toolConduit Size Calculator
Conduit sizing to BS 7671 and the On-Site Guide: singles by the Appendix E factors for run length and bends, FP200 type multicore by the 45% space factor with a physical fit check. Free to run.
v1.5.8 · Verified BS 7671, IET On-Site Guide App E, BS 7629-1, BS 5839-1, BS 8519 Open the toolCPR Euroclass Selector
Get a cable's CPR reaction to fire class from the Declaration of Performance, not the datasheet, and validate it against BS 7671.
v2.4.2 · Verified BS 7671:2018+A4:2026 Section 422 and Appendix 2 Item 17, Building Regulations 2010 regulation 7, BS EN 60332-1-2, BS EN 61034-2, BS EN 60754-1, BS 9991:2024 27.2.2 Open the toolFire Alarm Design Guide
Category, zones, detector spacing, sound levels, standby batteries and the cause and effect matrix, each answer referenced to its clause.
v0.28.2 · Verified BS 5839-1:2025 (cl. 4 category, cl. 13 and 22 zoning, Tables 1 to 3 with cl. 21 and 22 detector siting and coverage, cl. 15 to 18 alarm devices, cl. 24 and Annex E power supplies and batteries, cl. 25 and 35 cables and containment), BS 9999:2017 Table 7, BS 9991:2024, BS 5839-6:2019+A1:2020 Table 1, BS 5839-8:2023, BS 5839-9:2021, BS 8629:2019+A1:2023, BS 7273-4:2015+A2:2023, BS 7273-6:2019, BS 8519:2020 Table 1, BS 8300-2:2018, BS 7827:2019, BS EN 54-23:2010, BS 7346-7:2013, HTM 05-03 Parts A, B, E, J, K and M, and Approved Document B volume 2 Open the toolTrunking Size Calculator
Size cable trunking to BS 7671 and the On-Site Guide. Singles by the Table E5/E6 factors, multicore by the 45% space factor, with compartments, grouping and fire stopping checked and drawn.
v1.3.8 · Verified IET On-Site Guide Appendix E (Tables E5/E6), ESC Technical Manual T113-1 and T113-3, BS 7671:2018+A4:2026 (521.5.1, 521.7, 521.10.1, 521.10.202, 527.2.2, 528.1, Reference Method B, Table 4C1), BS 5839-1:2025 35.5, BS 5266-1:2025 8.2.6, BS 8519 cl. 15/16 and Annex B Open the toolCable Tray Sizing Calculator
Pick your cables, arrange the runs by tier, and get every containment size, the bracket loads and the drop rods, in seconds.
v2.8.1 · Verified BS 7671:2018+A4:2026 App 4 (Ref Methods E/F, grouping Tables 4C1/4C4/4C5), OSG App D Table D1, BS EN 61914, BS EN 61439-1 Table 7, BS 8519:2020 (Table E.2, Annex I; 6.1, 7.1, 7.3 and clause 11 for life safety supplies), BS EN 61537 Open the toolGenerator Load Calculator
Size a standby or life safety generator straight from your load schedule.
v3.8.8 · Verified BS 8519:2020, BS 7671:2018+A4:2026 Ch.56, BS 9999:2017, LPC TB210:2022, BS ISO 8528-5 Open the toolEarthing Selection
A guided, standards backed walk through earthing arrangement selection.
v1.12.1 · Verified BS 7671:2018+A4:2026 Open the toolAbbreviations and Acronyms
Over 1,500 terms... for you to use. And still growing
v1.3 · Verified Open the tool