Dual Tariff Consumer Units Archives

Dual tariff consumer units, also known as Economy 7 or time-of-use (TOU) consumer units, are electrical distribution boards that are designed to accommodate electrical installations with two different tariff rates for electricity consumption. These consumer units are typically used in residential settings where electricity is supplied at different rates during peak and off-peak periods. Compliance with BS 7671 (the IET Wiring Regulations) is crucial when installing dual tariff consumer units. Here are some key points related to dual tariff consumer units in accordance with BS 7671:

Dual Tariff Electricity Supply: Dual tariff consumer units are designed to accommodate electricity supplies with two different rates, often referred to as “day” and “night” tariffs. The “night” rate is typically lower and applies during off-peak hours.
Metering: Dual tariff consumer units are typically associated with electricity meters that have two registers or a single meter with time-switching capability. These meters record consumption separately for the two tariff periods.
Control and Switching: Dual tariff consumer units may incorporate time switches or other control devices to switch specific circuits or loads between the day and night tariffs. For example, electric storage heaters and hot water immersion heaters are often connected to the night tariff.
Distribution of Loads: Careful consideration should be given to the distribution of loads in the consumer unit to ensure that circuits connected to the night tariff are appropriately protected and switched.
Circuit Labeling: It is essential to label circuits and devices within the consumer unit to indicate which circuits are associated with the day and night tariffs. Proper labeling ensures that users and maintenance personnel can identify the purpose of each circuit.
Compliance with BS 7671: The installation and configuration of dual tariff consumer units must comply with the 18th Edition of BS 7671 and any other relevant electrical standards and regulations. This includes ensuring proper selection of protective devices, cable sizes, and earthing arrangements.
Safety and Testing: Dual tariff consumer units should be installed by qualified electricians who are knowledgeable about the requirements of BS 7671. Additionally, regular testing and inspection of the installation are essential to verify that the time-switching and protective devices are functioning correctly.
Metering Accuracy: It is crucial to ensure that the electricity metering system, which is closely associated with dual tariff consumer units, is accurate and correctly calibrated.
Coordination with Utility Company: When installing a dual tariff consumer unit, coordination with the utility company is necessary to ensure that the electricity supply is configured correctly for the two tariff rates.
Documentation: Proper documentation of the dual tariff consumer unit installation, including circuit details and switching schedules, should be maintained for reference and maintenance purposes.

Dual tariff consumer units are commonly used in households with electric storage heating systems, where electrical loads like storage heaters and hot water cylinders are controlled to utilize cheaper off-peak electricity during the night. To ensure the safe and compliant installation of these consumer units, it is essential to engage with qualified electricians or electrical engineers who are knowledgeable about the specific requirements and standards related to dual tariff electricity supplies and consumer units in your region.

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Dual Tariff Consumer Units

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