BOSCH POWER ADAPTOR (PLUG PACK) AS USED WITH ALL BOSCH SOLUTION SERIES CONTROL PANELS AND KITS SOLD HERE. THESE POWER SUPPLIES COME WITH A 1 METRE LONG CABLE AND 3 CONDUCTORS TO BE TERMINATED TO THE ALARM SYSTEM: - TWO CODUCTORS DELIVER THE 18VAC POWER - THE THIRD CONDUCTOR IS USED TO EARTH THE ALARM CONTROL PANEL TO THE PREMISES EARTHING. COLOR MAY VARY FROM TIME TO TIME.