Cable d (fig 2) is a 3 center and earth, this is the ‘three twine control’ that links the 2 mild switches collectively.?com on the primary transfer connects to com on the second one switch, l1 on the primary transfer connects to l1 on the second one, and l2 on the first switch connects to l2 on the second. All earth wires need to connect to the earth terminal within the switch back-container and if you are the use of steel switches there have to be a loop from this earth terminal to the only on the transfer plate (see word a on fig 2). Right here we a have a schematic (fig 1) which makes it easy to visualize how this circuit works. In this country the lamp is off, changing the placement of either transfer will switch the stay to the lamp turning it on. In case you now alternate the location of the opposite transfer the circuit is damaged yet again.
Right here we've got a two manner switching system that utilises single gang -way switches and a three cord manage, proven in the antique cable colours. It's miles feasible to acquire a comparable end result the use of a wire control which, even though it saves on cable, isn't always encouraged. This is the desired method. 2 manner switching method having two or more switches in distinct places to manipulate one lamp. They are stressed so that operation of both switch will manage the mild.?this association is regularly observed in stairways, with one transfer upstairs and one switch downstairs or in lengthy hallways with a transfer at both stop.