An electrical load logger is a portable recording instrument that measures selected current, power, energy and demand quantities through time. It is used at a main board, feeder or branch circuit to show how electrical loading changes as a site opens, operates, reaches a peak and closes.
The resulting load profile can expose overnight base load, recurring peaks, exceptional events and the periods when several uses overlap. Those records give capacity, operating and energy studies a measured starting point.
A clamp reading can confirm the current present during a visit. A temporary logger keeps measuring while the property moves through its normal and exceptional operating states. The report can then separate a level that persists for hours from a peak that lasted for one interval.
One measurement moment
Current or power while the technician is present.
Useful for checking the condition that exists at that moment.
A named operating cycle
Current, power, demand and energy recorded against time.
Shows recurring peaks, base load, exceptional events and simultaneity.
Continuous operation
Long-term baselines, seasonal change and recurring patterns.
Supports ongoing energy management after the temporary question is understood.
Closest neighbouring instrument
Load loggers and power-quality analysers can use similar voltage leads and current sensors, and some models combine parts of both jobs. Their clearest distinction is the evidence the investigation needs to preserve.
Demand is rising, a new load is planned, or the site needs to understand when energy is being used.
A time profile of power, energy, demand, base load, recurring peaks and operating overlap.
Equipment resets, lights flicker, protection trips, or a voltage disturbance is suspected.
Voltage-quality trends, event timestamps, duration, affected phases, waveform detail and harmonic evidence, depending on the model.
A site can need both records. Before commissioning, confirm whether one advanced instrument, its sensors and its software can capture the required load profile and disturbance evidence, or whether coordinated measurements are needed.
The electrical current passing through each measured phase or circuit.
Checks loading and phase behavior. Current alone does not provide verified active power or energy.
The rate at which the measured loads are using electrical energy at that time.
Shows the operating demand that matters for capacity, load overlap and many energy decisions.
Active power accumulated through the recording period.
Connects the shape of the profile to total consumption over a shift, day or campaign.
Power summarized over a defined interval rather than a single instant.
Makes the selected averaging interval part of the result and part of the report.
A relationship between active power and the apparent electrical loading of the supply.
Adds context when current and available electrical capacity do not move in the same proportion.
IEC 61557-12 covers power metering and monitoring devices used in industrial and commercial electrical distribution systems. Instrument function and performance still need to match the selected measurement purpose. IEC 61557-12:2018
Read from left to right. Time runs along the horizontal axis. Active power in kilowatts runs up the vertical axis. The green line follows the measured demand through the day, while the shaded area represents power sustained through time and therefore contributes to energy use.
The overnight level that remains after most tenants and shared services have reduced operation.
The morning rise as offices, retail areas, ventilation, lifts and food-service loads enter operation.
The afternoon overlap that appears repeatedly under comparable occupancy and weather conditions.
The area under the power curve accumulates into energy. A brief peak and a long plateau can affect different decisions.
Loggers summarize measurements over selected intervals. A short interval can preserve a brief operating peak. A longer average may describe sustained demand more clearly while smoothing that short change. The campaign records both the interval and the operating question it was selected to answer.
One-minute averages
Fifteen-minute averages
The campaign identifies the occupancy, production, weather, deliveries, tenant activity or equipment state that the result is meant to represent.
The recording window covers the shift, weekday, weekend, seasonal condition or exceptional event needed to answer the investigation question.
Logger time, operator notes, alarms and building or tenant records use a consistent clock so profile changes can be interpreted.
Power loss, sensor movement, missing data and changes to normal operation remain visible in the campaign record.
The property included offices, retail units, shared cooling, lifts and a food-service tenant. Electricity bills showed rising demand, but the owner could not tell whether the highest value represented normal overlap or one unusual day. A temporary logger at the main LV board recorded a representative week while the site team preserved opening hours, cooling schedules, deliveries and tenant activity against the logger clock.
Recurring evidence
Weekday afternoons repeatedly carried the highest ordinary demand as cooling, retail and food-service activity overlapped.
Exceptional evidence
Thursday rose above the recurring band. The operating diary identified an exceptional tenant event that should remain separate from the normal design case.
Next boundary
The main-board record showed when to investigate. A targeted feeder measurement was still needed before assigning the afternoon contribution to a specific tenant or shared service.
The profile becomes useful when it changes a practical decision. Recorded evidence can narrow the work that deserves evaluation and preserve a way to check the result under comparable conditions.
Recurring maximum demand, phase loading and the operating conditions present at the peak.
Decision or investigation
Use the measured profile in the electrical study for a new tenant, process load, charger, cooling plant or other expansion.
Verification
Repeat the relevant operating condition after the change and compare demand at the same boundary.
Demand that remains overnight, during closure or outside the expected production window.
Decision or investigation
Target a branch measurement, control review or site inspection around the loads that should have reduced operation.
Verification
Compare the same off-hours window after schedules, controls or operating practices are adjusted.
Repeated periods when several major uses operate at the same time.
Decision or investigation
Evaluate sequencing, setpoint coordination or non-critical load shifting with the affected operators.
Verification
Confirm that the profile changed without moving the same operating problem to another period.
The timing and persistence of daytime demand and the difference between ordinary and exceptional days.
Decision or investigation
Use the profile as one input to self-consumption, battery dispatch or energy-efficiency studies.
Verification
Preserve a comparable baseline and account for occupancy, weather and operating changes when results are reviewed.
A main-board profile shows the combined demand crossing that boundary. It cannot identify every appliance or prove responsibility for a peak. Operating records, branch measurements and inspection provide the missing detail.
Portable products overlap. Some current-only loggers are deliberately narrow. Power and energy loggers add voltage references and calculated quantities. Advanced units may include remote transfer, harmonics or auxiliary inputs. The exact model, sensors and software determine the usable package.
Circuit loading or feeder-current studies where voltage, active power and energy are outside the question.
Evidence: Current trend, phase values and selected minimum or maximum records, depending on the model.
A simpler setup can answer a loading question. It cannot produce verified kW or kWh from current alone.
Capacity studies, energy audits, operating profiles and demand investigations.
Evidence: Voltage, current, active power, energy, power factor and interval demand.
The usual starting family when the decision depends on both electrical loading and energy use.
Campaigns needing remote transfer, additional inputs, longer unattended operation or selected harmonic context.
Evidence: Load profile plus model-dependent communications, event, harmonic or auxiliary-channel functions.
Extra capability has value when it serves the campaign. Product-family boundaries overlap, so the exact model still needs checking.
Sites that need continuous baselines, allocation or recurring operational visibility.
Evidence: Long-term meter data from fixed measurement points and a maintained data platform.
A temporary logger can establish the monitoring question before a permanent architecture is specified.
Rounded indicative equivalents use approximately 1 EUR = 10.68 MAD. Professional campaign pricing remains separate from instrument acquisition.
Sensor contents and communications vary.
Suitable current sensors and working accessories included.
Indicative hardware equivalents exclude Moroccan VAT, import, transport, installation, analysis services and, where absent from the package, current sensors, voltage accessories, software, communications and calibration. Market examples include Chauvin Arnoux PEL 100, Fluke 1732/1734, Hioki PW3360/PW3365 and Circutor MYeBOX families. Capabilities vary by exact model. Fluke 1732/1734 · Hioki PW3360 · Chauvin Arnoux PEL 100 · Circutor MYeBOX
A useful job records the measurement boundary, quantities, interval, operating window and complete equipment package before installation. Qualified personnel then apply the selected manufacturer method and site controls, validate the channels, preserve operating notes and restore the installation after removal.
The logger main unit, suitable power or battery arrangement, working storage and a confirmed export route.
Compatible voltage leads are required when the job needs active power, energy, power factor or voltage context. A current-only study has a narrower output.
Three compatible phase sensors for the typical three-phase LV case, selected for conductor access, expected range, accuracy and safety category.
Channel markers, secure support, current firmware, manufacturer documentation, calibration status, synchronized time and the analysis software or file format.
Neutral-current sensing, extra branch channels, flexible probes, remote communications and advanced software are scope- and package-dependent. PPE, controlled access, isolation planning and live-work controls are site-safety prerequisites rather than logger accessories.
Name the business question, measurement boundary, quantities, operating cycle, interval logic and report output before equipment is selected.
Qualified personnel follow the selected manufacturer and site method, then verify channels, sensor direction, ranges, clock, power, storage and plausible values.
Capture the agreed operating window while operator notes, tenant activity, starts, closures and exceptional events share the same time reference.
Export the profile and configuration, identify usable and missing evidence, document restoration, and define any branch measurement or repeat campaign.
It should also show which phases or quantities changed, whether the recorded operating window represents the business question, and whether the next step is longer recording, a different season, a narrower feeder boundary, inspection or permanent monitoring. One main-board profile does not identify individual loads by itself.
This owner/operator explanation describes campaign purpose and evidence. It omits terminal-level connection details. Live electrical measurements require qualified personnel, suitable equipment, current manufacturer instructions and site-specific controls.
A screenshot of the highest value is incomplete. The report preserves how the profile was acquired, which operating conditions it represents, how recurring and exceptional demand were separated, and which decision the evidence can support.
Logger model, firmware, sensor models and ranges, calibration status and software version.
One-line reference, point of connection, network topology, channel map and quantities recorded.
Start and finish, interval, demand period, time zone, power source, storage and any missing data.
Occupancy, tenant activity, schedules, weather or production state, alarms and exceptional events.
Load profile, base load, recurring and exceptional peaks, energy, phase observations and clearly labelled illustrative or measured values.
Interpretation, confidence, limitations, next measurement and the decision the evidence can support.
Which business or operating decision is the logging campaign expected to improve?
Which main board, feeder or branch circuit defines the measurement boundary?
Which quantities, channels, averaging interval and demand interval will be recorded?
Which operating days, tenant conditions or exceptional events must the campaign represent?
Does the proposed kit include suitable sensors, voltage leads, power, storage, software and calibration evidence?
Will the handover include the configuration, raw export, profile, operating notes, limitations and recommended follow-up?
Existing instruments, utility data and the selected measurement boundary can change the campaign. Timing, resolution, export access and operating context determine whether the available record is sufficient or another measurement is needed.
Electrical load logging gives owners and operators a time-based record of how a site actually uses electrical capacity. It can distinguish persistent base load from short and sustained peaks, show which periods deserve closer investigation, and provide measured evidence for expansion, scheduling, energy-efficiency, solar or storage studies.
The profile guides the next decision and provides a baseline for verification. Source attribution still depends on the measurement boundary, operating records, selective branch measurements and inspection.
Reveal
Base load, recurring peaks, exceptional events and periods of load overlap.
Guide
Capacity studies, operating changes, targeted feeder measurements and energy-project design.
Verify
Repeat the same boundary and comparable operating condition after the selected change.
Preserve
Configuration, interval, operating context, raw export, interpretation and limitations.
Send the measurement brief, one-line diagram, logger proposal, raw export or existing report. ReneWave can explain what the profile shows, which operating context is missing and what the next measurement should resolve.
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