Gang operated disconnector and air-break switch work on 11 / 22 kV overhead lines — supply, structure, erection, alignment, earthing and operational testing.
One handle, three blades. The gang linkage is what makes isolation real: if a blade only part-seats the switch reads closed and arcs, and if one does not open fully the line reads isolated and is not. The handle is bonded to earth because a person stands at it.
A gang operated disconnector — the AB switch on the pole, worked from an operating handle at ground level — is how an overhead HT line is isolated and sectionalised. It is what lets a crew take an outage on one spur instead of the whole feeder, and what makes a transformer safe to work on without waiting for the utility to switch upstream.
The work is mechanical as much as electrical. All three blades have to close together and fully, the operating pipe and linkage have to move freely after a monsoon, the structure has to be rigid enough that the line pull does not twist the frame, and the whole assembly has to be earthed. A G.O.D that half-closes is worse than none — it arcs, and it gives a false sense of isolation.
Without sectionalising points, any work on the line means shutting the whole feeder. With them, the outage is limited to the spur being worked on — which on a running plant is the difference between an hour of downtime and a day.
If one blade does not seat fully, the switch looks closed and runs hot; if one does not open fully, the line looks isolated and is not. Gang setting and blade alignment checked under operation is the entire point of the job.
The operating handle is at ground level and gets used in the rain. Bonding it to a tested earth, and locking it against unauthorised operation, is what keeps an isolation point from becoming a hazard.
Sectionalising point fixed on the feeder, structure fabricated and mounted to suit pole type and line pull.
Switch mounted, blades aligned and gang-set so all three phases make and break together and fully.
Line side jumpering and connectors made off; structure and operating handle bonded to a measured earth.
Switch operated through its full travel under supervision, linkage greased, locking fitted and the point recorded on the feeder drawing.
Send the load, the voltage level and the location. We survey, then quote against a defined scope.
