How many do I need?
A minimum of two RCDs protecting all power and lighting circuits must be installed to a premises as well as a minimum of one mains powered smoke alarm depending on the size or layout of that premises.
Smoke Alarms & RCD Installation
Smoke Alarm and RCD Requirements:
By Law having smoke alarms and RCDs fitted to your premises is compulsory. To avoid injury or fatality, as well as extensive damage to your property, it is essential that a qualified technician carries out the installation.