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Use a local equipotential bonding bar if possible. For proper operation the SPD must be connected to a low impedance ground. Remote Contact Signaling: In case of a device with remote contact signaling make sure that the torque is as indicated in the technical data. The remote status indicator (SPDT contact) shall SPD classifiaction Type 4 Component Assemblies be connected to NEC Class 2 circuits only! Problem Diagnostics: If there should be any problem please contact your local DEHN representative.