BSC Codes of Practice and Smart Meters

Guidance Note

5.1 - 5.3

Current Transformers

The SMETS do not cover Current Transformer metering. The CoP10 requirements will apply.

5.4.1

Displays

Although the SMETS Meter records Import kvarh and Export kvarh, there is no requirement to display these.

Other display capabilities that the SMETS do not include are Maximum Demand (MD) kVA, Cumulative MD and number of MD resets. However, these are optional requirements, ‘as specified by the Registrant’. It is unlikely that Suppliers will require these features for the significant majority of domestic and small non-domestic sub-100kW Metering Systems.

5.5

Protocol Approval

Meters that are SMETS compliant do not require approval under BSCP601 ‘Metering Protocol Approval and Compliance Testing’.

5.5

Time Synchronisation

The responsibility will move from the HHDC to the Supplier/DCC and is part of the protocol approval process.

5.5

Separately fused supply for modems

There are requirements in the SMETS about the supply to Communications Hubs.

5.5.1

Data Storage

There are no SMETS equivalents to the requirements that –

• ‘the resolution of the Active Energy transferred into the demand registers shall be within ±0.1% (at full load) of the amount of Active Energy measured by the associated Meter’;

• energy measured in a Demand Period but not stored in that Demand Period should be carried forward to the next Demand Period;

• the clock and calendar can function for 20 days without an external supply.

5.5.2

Time Keeping

There are no SMETS requirements to maintain time keeping accuracy allowing for failures to communicate of 20 days.

5.5.3

Monitoring / Alarms

There are no SMETS requirements for –

• battery monitoring

• Demand Periods truncated or extended by a time synchronisation;

• Metering equipment functionality errors.

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