Part 1: Electrical Insert
The main part of the switch, which gets fitted first. Wire the connectors at the back of the unit to the existing electrical installation and then screw the unit into the back box with flat-head device screwsย (to enable the frame to sit flush on top of the unit).
Being an authentic replica product, the connectors on THPG switches are “old-fashioned” screw fittings. The live connector is copper-coloured.
THPG 1-gang 2-way insert with 2-way wiring points
THPG 1-gang rotary side view
Fitting the insert to back box (a round Euro box in this case)
Securing the insert to the back box
Part 2: Frame
As usual with European switches, the frame that provides the decorative cover over the insert is not permanently fixed to the unit. In THPG switches, it is held in place by a small front plate (see part 3).
Correct alignment of the frame over the insert
The frame should sit flush to the wall
Part 3: Front plate
The small round front plate is placed over the round opening in the frame and is secured with the included small hexagonal nut.ย Please make sure not to over-tighten the nut, which can cause deformation or cracking ofย the front plate.
The rotary knob/handle then slides onto the protruding central part of the insert and the included small flat-head screw goes into the centre slot of the handle. The last step of fitting the switch is simply tightening that screw, to secure the handle. Again, please don’t over-tighten anything – Bakelite, Duroplast and particularly Porcelain can crack or splinter easily.
Frame, front plate and rotary handle (Bakelite)
Aligning the front plate on top of insert and frame
Securing the front plate with the supplied nut
The rotary handle/knob is pushed onto the insert
The centre screw is tightened to secure the handle
Removing the switch
With THPG switches you simply need to reverse the fitting process if removal is required. Loosen the small flat head screw in the centre of the rotary knob until it comes out. Remove the small nut which holds the front plate in place and take off front plate and frame.