Starting characteristics and pump data: BSRIA BG 70/2017, including the Tables 8 to 10 pump examples, the stall window held for 75% of the hot burn-out time unless the protective device clearance time is entered, and the 9 to 13 s burn-out band with the Table 6 typical values. Start sequence: sprinkler pumps immediately power is available, the duty wet riser pump 15 s later and the assist 30 s later (BG 70/2017; LPC TB210:2022 Clause 8.2.1). Power factor by starting method as rules of thumb, overridable per row: 0.30 direct on line, 0.35 star-delta, 0.45 soft start and 0.90 inverter driven while starting. Defaults where a figure is left blank: locked rotor at 6 times full load current, a 3 s run-up at locked rotor, a 0.4 s delta re-inrush, soft start limited to 2.5 times and an inverter to 1.5 times full load current. Inputs with stated defaults: changeover time 15 s (BS 9999 37.2.3.3 b), BS 8519 6.3), rated power factor 0.8, structure fire resistance period 120 min, smoke control duration 60 min. Acceptance limits: BS ISO 8528-5:2013 Table 4 performance class G2, with the 70% variable average of a standby rating (ISO 8528-1, BS 8519 6.3); the 80% steady headroom is a PD indicative warning, not a standard limit. Fuel storage: BS 8519:2020 Table 2 with the local service tank of 6.3. 17 typical life safety loads include real project values and start times as a starting point. Manufacturer motor and pump data takes precedence for every input (BS 8519 20.1), and the generator manufacturer's own sizing run is the selection of record.

16/09/2026 (3.8.8): the wording in the tool was revised in plain UK English. The compliance record line now says in the tool. The ratings, the checks, the printed report and the exports are unchanged. The 2,688 scenarios in each tier, the derived-input check and the term-of-art check were re-run on 3.8.8 with no findings; verified live after upload. 15/09/2026 (3.8.7): the notes written inside the program code were rewritten in plain UK English. The calculations, the wording shown in the tool, the printed report and the exports are unchanged. The 2,688 scenarios in each tier were re-run on 3.8.7 with no findings; verified live after upload. 15/09/2026 (3.8.6): the wording in the tool, the report and the reference lines was revised in plain UK English. The fuse requirement now reads: the fuse shall not clear the stalled rotor current before 75% of the period needed for the windings to fail (BS 8519 20.1; TB210 8.2.1(e)), with its meaning unchanged, and the over-range line names the largest standard set listed. A new automated check reads the wording of every program file, in the tool, the report and the printed sheets after all 20 presets, and fails on the 3.8.5 build; the 2,688 scenarios in each tier, the derived-input check and the term-of-art check were re-run on 3.8.6 with no findings; no rating, check or limit changed; verified live after upload. 10/09/2026 (3.8.4) and 11/09/2026 (3.8.5): a check across every PD tool for a control shown to every user that only a minority case reads, and for a default that misdescribes the load. The rating basis choice, standby (ESP) or prime (PRP), applies only to a size entered for checking, yet it was shown in recommend mode where the recommendation is always a standby rating under ISO 8528-1; it now shows only once a size is entered and cannot change a recommendation. A Fire DB or small power line is resistive, yet a custom line defaulted to direct-on-line starting; a line created on, or moved onto, that category now takes the Non-motor load type, and a Fire DB line left on a motor type prints a check line naming it. A new automated check tests both in both tiers and fails on the 3.8.3 build, and its second half fails on the 3.8.4 build; the 2,688 scenarios were re-run in each tier on 3.8.4 and again on 3.8.5 with no findings; no rating, default or check value changed; verified live after upload. 04/09/2026 (3.8.3): the full input range was enumerated, 3,408 scenarios in each tier, free and Toolkit: every category, starting method, full load current, stalled current and burn-out time in both scenarios, every combination of checked size, rating basis, fuel philosophy, changeover time, rated power factor, structure period and smoke duration, duty and standby pairs with a wet riser, and blank or nonsense entries; peak, steady and stalled demand were recomputed from the currents entered, the recommendation was re-derived from the printed figures, and the BS 8519 Table 2 fuel row, the changeover time and every duration were checked line by line. Two minor findings were corrected: the record printed an entered 26.5 A as 27 A, and the burn-out time field was offered on lines where nothing used it. The checks were re-run on 3.8.3 with no findings (2,688 scenarios in each tier once that field is pump-only), and the script on the live site was confirmed identical to the tested build. 04/09/2026 (3.8.2): every numeric input was checked for the figure a reader could enter in its place. The stalled current is now defined as the delta (direct-on-line) locked-rotor value, the star value is named as the trap, and a stalled current below 3.5 times the full load current on a pump or motor line is flagged in the tool; a size entered for checking now states its rating basis, standby (ESP) or prime (PRP), and the checks name it; the normal current, hot burn-out time and rated power factor name the figures they are confused with. No rating, default or check value changed; the check for a figure entered in place of another and the audit checks all passed, and the script on the live site was confirmed identical to the tested build. 04/09/2026 (3.8.1): BS 8519:2020 clause 6.3 was read back word for word; it sets no on-load test regime or interval, so the two light-running notes that cited it now point to the set manufacturer's operating requirements. No rating, default or check changed; the audit checks passed and the script on the live site was confirmed identical to the tested build. 03/09/2026 (3.8.0): a check across every PD tool that every printed value is reached through the input the standard derives it from. The equipment record was found to print the start times as entered rather than as the worst case modelled them, and the stalled-rotor line could print when no pump had been held; both were corrected. The changeover time, rated power factor, structure fire resistance period and smoke control duration, previously fixed figures, are now inputs with their defaults stated, and the protective device clearance time can be entered per pump. The 80% steady headroom is now a labelled PD warning. The full typical building returns the same 500 kVA as 3.7.2 and the BG 70 pump examples the same 1500 kVA; confirmed by the audit checks and verified live after upload. 02/09/2026 (3.7.2): every cited clause was read back against its source; the sizing principle now states BS 8519:2020 6.3 as the recommendation it is, a set sized to maintain the maximum design load and to support the worst-case transient and fault conditions; no rating, default or check changed. 02/09/2026 (3.7.1): the revised wording was checked in the tool against the house style; no rating, default or check changed. July 2026: a compliance audit of 40 checks traced every claim to its clause, and the sizing was verified against BSRIA BG 70/2017 Example 2 and the generator selection of a live project.