Electricity Sub-Meter Maintenance Checklist
Keep tenant recharge and energy data defensible — reading reconciliation, CT-ratio and pulse-output verification, MID-compliance checks, and BMS data integrity.
What is an electricity sub-meter maintenance checklist?
A electricity sub-meter maintenance checklist is a structured list of the 10 preventive maintenance tasks — covering visual, functional and record-keeping checks — that keep an electricity sub-meter running safely and reliably. It groups routine checks by frequency, from daily inspections to annual servicing, so FM teams and building engineers can plan and evidence preventive maintenance.
Core electricity sub-meter checks
- Inspect terminations, CT leads, and the meter for security and damage
- Reconcile a manual meter reading against the BMS/aMR logged value
- Confirm MID compliance where the meter is used for tenant billing
What is an electricity sub-meter?
An electricity sub-meter measures consumption for a tenant, floor, or item of plant downstream of the main incoming meter, supporting tenant recharge, energy management, and ESG reporting. Sub-meters use current transformers (CTs) on larger circuits and feed pulse or Modbus/BACnet data to the BMS or aMR system. Where used for billing a tenant, meters generally need to be MID (Measuring Instruments Directive) compliant. Accuracy depends heavily on the CT ratio being set correctly and the CTs being installed the right way round — a common and costly error. Maintenance verifies readings, CT configuration, and data integrity.
Typical Electricity Sub-Meter maintenance checklist
A practical starting point for planned preventive maintenance. Always refer to the manufacturer's O&M manual and site-specific requirements.
Visual Checks
- Inspect terminations, CT leads, and the meter for security and damage
- Confirm meter mapping matches the metering schedule and distribution boards
Functional Checks
- Reconcile a manual meter reading against the BMS/aMR logged value
- Confirm the configured CT ratio matches the installed current transformers
- Check CTs are installed the correct way round and on the right phases
- Verify the pulse/Modbus/BACnet output reports correct, incrementing data
- Check the meter reads near zero when the metered load is off
- Reconcile sub-meter totals against the parent/incoming meter
Record Keeping
- Confirm MID compliance where the meter is used for tenant billing
- Record readings, CT settings, and reconciliation in the metering log
Typical maintenance frequency
Suggested intervals for electricity sub-meter maintenance. Actual frequencies should follow manufacturer guidance and site-specific risk assessments.
Monthly
- •Reconcile manual vs logged reading
- •Reconcile sub-meters vs parent
- •Review consumption trend
Annually
- •Verify CT ratios and orientation
- •Confirm MID status for billing meters
- •Check comms/pulse integrity
- •Audit meter mapping
Common faults and issues
Issues to be aware of when maintaining electricity sub-meter equipment.
Safety and compliance notes
Key safety considerations for electricity sub-meter maintenance. This is general guidance only — always follow OEM instructions, statutory requirements, and your organisation's safe systems of work.
Managing Electricity Sub-Meter documentation with PM Assist
PM Assist helps FM and building operations teams search their O&M manuals and building drawings in seconds. Upload your electricity sub-meter documentation and ask questions like “What is the CT ratio for this meter?” or “Which board or tenant does it serve?” — and get source-cited answers instantly.
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