A commercial power-system and a private power-generating system are connected via a high-speed current-limiting breaker. After that, a positioning boss 7 is fitted into a long hole 43 formed in an attachment receiving member 41, and at the same time, a fitting head portion 28 of each clip 1 is fitted into each long hole 42 formed in the attachment receiving member 41. In a preferred example the flexible circuit sensor subassembly, the sensor circuit has a sensor at a distal end, as for example a surface mount device thermistor, a plurality of trace pads at a proximate end, and an interconnecting conductive trace between each trace pad and the sensor.