Installation of an Ground RodTrunkPBXGround Rod(Underground)Surge ProtectorGroundingWire1. Connect the ground rod to the surge protector using a grounding wire with a cross-sectional area of atleast 1.3 mm2.2. Bury the ground rod near the protector. The grounding wire should be as short as possible.3. The grounding wire should run straight to the ground rod. Do not run the wire around other objects.4. Bury the ground rod at least 50 cm (20 in) underground.Note• The above figures are recommendations only.• The length of ground rod and the required depth depend on the composition of the soil.3.2.10 Backup Battery ConnectionThe backup battery and Back-up Battery Cable provide a backup power supply to allow full use of the PBXin the event of a power failure. In case of power failure, the backup battery automatically maintains thepower to the PBX without interruption.User-supplied Items• Backup Battery: VRLA (Valve Regulated Lead Acid) 12 V DC × 1• Back-up Battery Cable: KX-A227WARNING• There is a danger of explosion if a backup battery is incorrectly replaced. Replace only with the sameor equivalent type recommended by the battery manufacturer. Dispose of used batteries according tothe manufacturer’s instructions.• Make sure that you do not short the backup battery or cables.CAUTION• Make sure that the Back-up Battery Cable is securely fastened to both the backup battery and thePBX.• Make sure that the polarities of the backup battery and wiring are correct.• Use the correct type of Back-up Battery Cable for the PBX.NoticeBe sure to comply with applicable local regulations (e.g., laws, guidelines).3.2.10 Backup Battery ConnectionGetting Started 57