Electronic Registers and Ancillary Equipment Incorporated in Metering Assemblies Specifications (SI/90-156)
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Regulations are current to 2026-04-28
23 A non-resettable register that operates from the main power supply and that is exposed to ambient temperatures within the operating range of the register shall, in the event of a power outage, continue to function for a period of at least
(a) 24 hours, where a back-up power supply that automatically recharges on restoration of power is used; or
(b) seven days, where any other type of back-up power supply is used.
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