Temporary Electrical Systems (TES) is covered by BS 7909 Code of practice for temporary electrical systems for entertainment and related purposes. Ditch the paper 7909 certs and Get the App.
From the BSI “The systems covered by this British Standard operate at low voltage as defined in BS 7671:2008+A1:2011 and supply equipment normally operating at 230 V a.c. or 400 V a.c. 50 Hz. Electricity at low voltage can be taken from an existing installed electrical system, the public supply, privately owned supplies or from mobile or portable generators. Direct current supplies are outside the scope of this British Standard.”
According to the BSI website BS 7909 : 2011 is currently under review, we expect the changes to reflect recent changes within BS 7671, which may also include amendment 2.