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.
This checklist is one of 6 in our metering maintenance checklists, covering energy, heat, water and gas meters — read integrity, accuracy checks and the data quality behind aM&T reporting.
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
Download the free Electricity Sub-Meter maintenance checklist PDF
Get all 10 tasks as a printable PDF — free, no signup needed. Keep a copy in the plant room, attach it to work orders, or share it with your maintenance contractor.
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.
Reference standards and frameworks
- United Kingdom
- CIBSE TM39 (building energy metering)
- North America
- ASHRAE energy-management and submetering guidance
Frameworks commonly referenced when planning electricity sub-meter maintenance programmes. Always confirm the requirements that apply to your site and jurisdiction.
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.
See PM Assist answer questions about a real electricity sub-meter manual — try the live demo, no signup needed.
Take this checklist with you
Download the branded PDF, generate a custom version for your asset, or run AI search across all your building documentation.
Related free tools
Related maintenance checklists
Energy Meter maintenance checklist
Metering · 9 tasks
Heat Meter maintenance checklist
Metering · 10 tasks
Water Meter (Mains & Sub-Meter) maintenance checklist
Metering · 10 tasks
Distribution Board maintenance checklist
Electrical · 9 tasks
Low Voltage Switchgear maintenance checklist
Electrical · 10 tasks
Further reading on electricity sub-meter maintenance
Compliance topics for electricity sub-meter maintenance
Frequently asked questions
Why are my electricity sub-meter readings wrong?
Does a sub-meter need to be MID compliant?
How do I check sub-metering is accurate?
Manage your building documentation with AI
PM Assist gives FM teams instant access to O&M manuals, drawings, and maintenance knowledge — all searchable with AI.
- Upload and organise building documentation
- AI-powered search across all your manuals
- Source-cited answers for maintenance queries
- Team collaboration and access control
- No credit card required to start