SEC v30.0 implemented to align the UISS Target Response Times across SMETS2+ and enrolled SMETS1 Device Models

13 January 2021

An updated version of the SEC came into effect today, 13 January 2021, to implement a modification to SEC Appendix E ‘DCC User Interface Services Schedule’ (UISS) made by the Department for Business, Energy and Industrial Strategy (BEIS).

This is to align the Target Response Times within the UISS across Smart Metering Equipment Technical Specifications 2+ (SMETS2+) and enrolled SMETS1 Device Models.

Paragraph 3 of the UISS previously restricted the Target Response Times for Scheduled Services to SMETS2+ Devices only. This restriction has been removed, making the Target Response Times applicable to SMETS1 and SMETS2+ Devices, thereby making sure that the regulatory framework reflects the system behaviour.

The accompanying documents can be found via the following links:


What parts of the SEC were affected?

  • SEC Appendix E ‘DCC User Interface Services Schedule’


Where can I access the redlining?

The redlined changes to this Appendix can be found on CodeWorks via the links below:


Our Document Log lists the versions of each SEC document now in effect following this release.

You can download the individual SEC documents from the SEC and Supporting Documents section of our website or via CodeWorks.


Where can I find further information?

If you have any questions, you can call the SECAS Helpdesk at 020 7090 7755 or email