The Automist Smartscan circuit should be clearly labelled (a sticker is provided for this purpose and is placed during commissioning). Automist Smartscan requires an independent 230V a.c. / 50Hz electrical supply, not shared with other unrelated devices. The Automist system, fire detection and alarm system may use this circuit, which must remain powered in the event of a fire. Power to Automist Smartscan must be provided via an unswitched fused connection unit (FCU). Automist Smartscan should be supplied using FP200 cable or better, ideally inside conduit or protected 50mm deep within a wall, and with RCD or RCBO protection. RCD or RCBO protection may be required, however, by applicable electrical installation regulations, in which case the circuit design must be such that the operation of any other RCD, RCBO or safety device does not affect the operation of Automist Smartscan. Typically, on a split-load board, Automist Smartscan should be connected to the non-protected side of the board. Where there are no spare ways in the existing consumer unit, or there are no available non-RCD protected ways in the existing consumer unit, the electrician may wish to use a Henley Block to provide new tails to a second distribution board (typically a 2- or 4-way unit) with no spare ways for future use. When prepay meters are present an additional prepay meter housed should be added specifically for Automist and housed within a lock box. The prepay meter for Automist can then be charged as part of the maintenance cycle.