Which IPMVP option uses field measurement of the key parameter(s) explaining the savings ONLY (with the others estimated) for an isolable ECM?
A — Option A — Retrofit Isolation, Key Parameter Measurement
Option A is correct: it isolates the ECM and measures only the key parameter (e.g. kW of the new LED fittings) while estimating the rest (operating hours, from spec or stipulation). Option B is wrong because it requires measuring all parameters (kW AND hours), giving higher accuracy at higher cost. Option C is wrong because it monitors the whole facility through the main meter rather than isolating the ECM. Option D is wrong because it relies on a calibrated simulation model, used when baseline or reporting data are unavailable (new construction, missing metering).
Remember: A = 'Approximate the rest, measure the key driver'; B = 'Buy more meters, measure Both factors'.
- A.Option A — Retrofit Isolation, Key Parameter Measurement✓
- B.Option B — Retrofit Isolation, All Parameter Measurement
- C.Option C — Whole Facility
- D.Option D — Calibrated Simulation
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