The reason I ask is that I came across one this morning. There was no supply to a seperate CU supplying 4 storage heaters. The supply was present up to this BS775 box. Inside there was a push to make switch and a 3a fuse. I've never seen one before, has anyone else come across these and do you know why they are used. It looked to be about 40 years old I suspect. There was a label on the lid which read ' an offence to tmaper with' so I am presuming that this on the suppliers side?
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