MTO's Installation Box Extension

thingiverse

This is an extension of standard (in Sweden any-ho) electric 73 mm (60 mm CC) installation box. The one you mount light switch, dimmer, electric socket, thermostats and communication jacks etc. It is 13 mm like standard construction plasterboard. I just printed 7 pcs that will be used tomorrow and they seams to work fine when tested. Way easier than using the extensions I found and loads easier to take down old boards and re-do the whole wall. There is two ways to mount this. 1. Screw the extension on to the original installation box. Then put M3 nuts in the slots on the "dices". Slide the dices in to the extension on each side. Attache the control/connection unit of choice as usually with M3 countersunk screws as usually. Dont use to long screws for this setup. 2. Put the "dices" in place. Set the control/connection unit in place. Use 25-35 mm M3 countersunk screw and attach the unit to the old box through the extensions screw holes. Only 2 wee longer screws needed in this way to do it. The picture of extension mounted on an installation box is printed version 1. Fixed details on v2.0 but works the same. I will make one 6 mm distance (for plasterboard used specific for renovation and one 15 mm for extension when using standard construction plywood board. If used in wet area like "wet zone 1 & 2" it is good to use a sealant between the old box and the extension. Why make it so complicated with the "dices"? It is easier to find shorter M3 countersunk screws. If some one else will work with your electric installation or if it will be handled often etc it is nice to not get the extension in the hands when working with it.