This circuit is wired the same way as the 3 way lights at this link. In an intermediate switch there are four terminals by which it changes the flowing of electric current from one circuit to another see fig 1 2 and also known as three way switchit has the ability to on and off the electric supply by two ways.

Vk 4388 2 Gang 3 Phase Switch Wiring Diagram Wiring Diagram
Crabtree intermediate switch wiring diagram. 3 way switched outlet wiring. Black wire power or hot wire white wire neutral bare copper ground. Crabtree product catalogue wiring accessory domestic circuit protection 2010. When wiring a 2 way switch circuit all we want to do is to control the black wire hot wire to turn on and off the load. The diagram shows single colours only. Switch one is the switch that contains the live wire and switched live wire.
More 4 way switch wiring diagrams four way switch wiring schematic. Three way light switching with the old wiring colours. The source is at the sw1 where the hot is connected to. Including building regulations and wiring regulations bs7671. You will also need an intermediate switch to fit in between the other two switches this can easily be identified as it has two l1 terminals and two l2 terminals. Intermediate switch related circuit diagrams and wiring diagrams intermediate switch wiring diagram old cable colours intermediate switch wiring diagram new cable colours the intermediate light switch is used where three or more switches control one light and used in conjunction with two two way light switches to achieve this.
Construction working of intermediate switch. The four terminals of intermediate switch construction and its operation are shown in fig below. The electrical switch box that contains the line and load wires may need to be bigger than the other switch boxes especially if there are other wires going into the switch box. The total current supplied by the unit must not exceed the rating of the incoming main. May 12 2019 unique crabtree double light switch wiring diagram diagram diagramsample diagramtemplate wiringdiagram diagramchart worksheet worksheettemplate. Wiring easier and quicker l 3mm minimum switch contact gap l double pole switching l additional electrical safety from neutral make first break last feature l switch contacts with silver contacts on both surfaces for good continuity l backed out and captive terminal screws l dual earthed installation logic plus socket outlets.
This simple diagram below will give you a better understanding of what this circuit is accomplishing. If in doubt contact a qualified competent person. Below is another method for wiring 4 way switches. Three wire cable runs between the switches and the outlet. Product catalogues brochures. Crabtree intermediate switch wiring diagram.
Only crabtree starbreaker rangebusbars mcbs rccbs rcbos and main switches must be used within the crabtree starbreaker range of units. In this diagram two 3 way switches control a wall receptacle outlet that may be used to control a lamp from two entrances to a room.