This represents the line source that is supplying power to this receptacle. not-specified The line source supplying power to the load for this receptacle has not been specified/configured. line-1-N The load for this receptacle is supplied by a line-to-neutral configuration. (line 1 to neutral). line-2-N The load for this receptacle is supplied by a line-to-neutral configuration. (line 2 to neutral). line-3-N The load for this receptacle is supplied by a line-to-neutral configuration. (line 3 to neutral). line-1-line-2 The load for this receptacle is supplied by a line-to-line configuration (line 1 to line 2). line-2-line-3 The load for this receptacle is supplied by a line-to-line configuration (line 2 to line 3). line-3-line-1 The load for this receptacle is supplied by a line-to-line configuration (line 3 to line 1). unknown-line-neutral The load for this receptacle is supplied by a line-to-neutral configuration. The system is unable to determine which lines are supporting the load. unknown-line-line The load for this receptacle is supplied by a line-to-line configuration. The system is unable to determine which lines are supporting the load.