12V Downlighters

[Leecatt]

My understanding has always been that any circuit under 50V does not require a COC and is excluded from the regulations.
Home alarms, intercoms and Solar systems and battery systems fall under this category. However I would assume that if there is an inverter involved, which generates 220V, may ...........................

The circuit for low voltage lighting (usually 12 volts) is covered extensively in Section 7.9 of Sans 10142-1:2009.

Solar systems are also covered in section 7.12 Alternative supplies (including low-voltage generating sets,
photovoltaic (PV) installations, etc.)

I hope this helps