The utility model discloses a 3 2 isolator pattern of working a telephone switchboard with generating line transfer switch, the problem of the technique is solved: invest in the height, arouse the maloperation easily to the double bus scheme among the prior art that single bus segmentation is nimble reliable technical problem inadequately. The technical scheme who adopts: a 3 2 isolator pattern ofworking a telephone switchboard with generating line transfer switch, includes 1M generating line and 2M generating line, draws forth the 1M generating line through the single ground connection isolator of first generating line side and be qualified for the next round of competitions on the 1M generating line, draws forth the 2M generating line through the single ground connection isolator of second generating line side and be qualified for the next round of competitions on the 2M generating line, concatenates between the 1M generating line is qualified for the next round of competitions andthe 2M generating line is qualified for the next round of competitions and shifts isolator, all set up the interval equipment of being qualified for the next round of competitions with the 2M generating line on being qualified for the next round of competitions on the 1M generating line is qualified for the next round of competitions. The advantage, the utility model discloses the wiring pattern realizes the flexible distribution of power and load, and engineering cost is more moderate, has popularization nature.