Insight / Metering
Technik Intelligent Systems
Technik Intelligent Systems
Commercial & Industrial Metering · Specification Guide
Electric metering should be designed around two core questions: what needs to be measured, and how the data will be collected and used. In a modern building the meter is no longer just a device for recording kWh. It is part of the building's operational data infrastructure, supporting tenant billing, landlord cost recovery, energy management, ESG reporting, plant optimisation, fault finding and regulatory compliance.
01 · Structure
At the highest level, most buildings have a main incoming electricity meter, often called the fiscal, settlement, utility or supply meter. This is the meter the licensed supplier uses to bill the whole site. Government guidance now expects new premises to be designed and constructed so that smart meters can be installed and commissioned from the outset, and for larger commercial and industrial supplies this may be a smart or advanced meter providing regular interval data. The incoming meter is essential, but on its own it is rarely enough for a multi-let office, industrial estate, manufacturing facility, logistics building or mixed-use asset.[1]
Below the incoming supply, the building should be split into a suitable sub-metering structure. Sub-meters sit downstream of the main supply to measure specific tenants, floors, distribution boards, landlord areas, plant rooms, HVAC equipment, lighting systems, EV chargers, data rooms, production lines and other major loads. This is the level that gives landlords and occupiers real operational visibility, allowing electricity to be allocated to the correct user or activity rather than treated as a single whole-building cost.
02 · Billing
For tenant billing and cost recovery, the preferred meter type is a MID or MIR-approved electricity meter. In the UK, gas and electricity meters used for trade are covered by the Measuring Instruments Regulations 2016, which implemented the recast Measuring Instruments Directive into domestic law. Where a landlord, managing agent or estate operator uses a meter reading to calculate a financial charge to a tenant, occupier or department, the meter should be properly approved and suitable for billing use.
This matters most in multi-let commercial buildings, serviced offices, industrial units and estates where electricity is recharged to occupiers.[2]
If a meter reading turns into an invoice, specify an MID or MIR-approved meter from the start, not as an afterthought.
03 · Meter types
For small loads, a direct-connected single-phase or three-phase meter may be suitable, where the load sits within the meter's direct current rating: small tenant units, lighting boards, office distribution boards or smaller mechanical loads. They are simple to install and cost-effective where the circuit size allows.
For larger commercial and industrial loads, CT-operated meters are usually more appropriate. CT stands for current transformer: rather than passing the full load through the meter, current transformers fit around the supply conductors and provide a scaled measurement signal. CT metering suits larger distribution boards, main switch panels, large tenant supplies, heavy plant, chillers, industrial machinery, production areas and high-capacity three-phase supplies, where loads are too high for direct-connected metering.
There are also multi-function and power-quality meters. A basic kWh meter records consumption, but a multi-function meter adds voltage, current, kW, kVA, kVAr, power factor, frequency, maximum demand, import and export energy and per-phase data. These are far more useful in commercial and industrial buildings because they let facilities teams understand load profiles, phase imbalance, demand peaks, reactive power and abnormal consumption. In industrial settings, higher-grade meters may also monitor harmonics and voltage events that affect sensitive equipment or production processes.
04 · Communications
A good meter that cannot be read reliably becomes a maintenance problem. A modern commercial or industrial metering strategy specifies both the meter type and the communication protocol from the start.
One pulse per fixed quantity of energy. Simple counting and common on older meters, but usually cumulative only and easy to lose at the data level. Fine for legacy or basic monitoring, not the first choice for new installs.
Widely supported by meters, BMS, gateways and PLCs. Reads kWh plus live kW, voltage, current and power factor. Robust and cost-effective: the default for wired sub-metering.
Modbus over Ethernet and IP. Suits structured cabling and IP gateways and simplifies analytics integration, but needs IT coordination, cyber security and network segregation. Best for larger sites and campuses.
Common in utility and heat metering. Useful in mixed-utility strategies that bring electricity, water, gas and heat together, though Modbus is more common for electricity-only BMS and industrial integration.
MS/TP or IP, read directly by the BMS without translation. A good fit where the BMS is the primary consumer of the data and the building already has a strong BACnet architecture.
Wireless M-Bus, LoRaWAN and wireless gateways suit difficult or disruptive cabling, especially in legacy buildings. Check signal strength, battery life, building fabric and long-term maintenance first.
Independent AMR with no reliance on tenant IT. Useful for estates, remote cupboards, landlord and temporary supplies. Watch data costs, signal availability, cyber security and data ownership.
05 · Specification
For any circuit used for billing, tenant recharging or formal cost allocation, install MID or MIR-approved multi-function meters. Make them three-phase capable, CT-operated where load size requires it, and specify open protocols such as Modbus RTU, Modbus TCP, BACnet or M-Bus to match the site architecture. Avoid closed, proprietary-only systems unless there is a specific reason, because they make future integration, analytics and platform changes harder.
For new builds, design the metering strategy alongside the electrical distribution strategy, considering everything from the outset:
This aligns with UK Building Regulations guidance, which expects effective metering and sub-metering in non-domestic buildings, and with government guidance that new buildings should be smart-meter-ready from the start.[1] [3]
06 · Legacy
For legacy buildings, the best approach is usually phased improvement. Survey, document and test existing meters for suitability. Where meters are pulse-only, inaccessible, undocumented, non-communicating or unsuitable for billing, prioritise them for replacement. Where communication networks are fragmented, gateways can bring legacy pulse, M-Bus or Modbus meters into a single data platform.
Where meters are used for tenant billing or formal recharging, the long-term move should be toward approved, communicating, remotely readable meters. The best specification is rarely the cheapest kWh meter: it is a billing-suitable, communications-enabled, open-protocol, multi-function meter that can be read remotely and integrated into a BMS, EMS, AMR or analytics platform.
07 · At a glance
In short
Commercial and industrial buildings should install communicating, remotely readable, approved electricity meters wherever the data drives billing, compliance, lease recovery or energy management. Modbus-enabled multi-function meters are usually the strongest default for sub-metering. BACnet suits a BMS-led building, M-Bus a mixed-utility network, and cellular or wireless a retrofit where wiring is impractical.
Planning a new build, a refurbishment or a fairer recharge model? Talk to us about specifying your metering properly.
info@technik-ims.net www.technik-ims.netReferences
Guidance for domestic and non-domestic new builds, intended to allow smart meters to be installed and commissioned from the outset, and stating that smart meters should be installed in all new build premises as standard. gov.uk
Explains that the Measuring Instruments Regulations 2016 implemented the recast Measuring Instruments Directive into UK domestic law and apply to gas and active electrical energy meters. gov.uk
Statutory guidance for energy performance in buildings other than dwellings under Part L of the Building Regulations: the conservation of fuel and power guidance for new and existing buildings. gov.uk
Best practice for the design, specification, installation, commissioning, data export and use of energy metering and sub-metering data in non-domestic buildings. cibse.org
Notes that the updated guidance covers meter selection, communications architecture, installation troubleshooting, commissioning, data analytics, Part L compliance and tenant billing. cibse.org
Explains that energy resale occurs where an intermediary such as a landlord buys electricity or gas from a licensed supplier and resells it to consumers, supporting the need for accurate, transparent metering where recharging is involved. ofgem.gov.uk