When were ceiling rose junction boxes invented? They appear to be post WW2 as I have been unable to find any that are older. The ceiling roses I have from the 1920s and 30s are either purely mechanical or have terminals just for live and neutral for the light fitting. Were ceiling rose junction boxes intended as a cost saving feature when constructing houses?
Alasdair Anderson: BS 67:1969. Specification for ceiling roses.
However the BSI website also has the following earlier editions of the standard: BS 67:1938. Specification for two and three-terminal ceiling roses.
I make a guess somewhere between 1938 and 1969. Notice that the 1938 specification mentions two and three terminal ceiling roses. The ceiling rose junction boxes I'm referring to in the OP consist of 3 + 3 + 2 terminals along with an earth terminal.
The loop wiring arrangement almost certainly predates the ceiling rose junction boxes as it was accomplished using a three terminal junction box with terminals for live, neutral, and switched live / power to the ceiling light. Earth was provided using a separate cable.
Alasdair Anderson: BS 67:1969. Specification for ceiling roses.
However the BSI website also has the following earlier editions of the standard: BS 67:1938. Specification for two and three-terminal ceiling roses.
I make a guess somewhere between 1938 and 1969. Notice that the 1938 specification mentions two and three terminal ceiling roses. The ceiling rose junction boxes I'm referring to in the OP consist of 3 + 3 + 2 terminals along with an earth terminal.
The loop wiring arrangement almost certainly predates the ceiling rose junction boxes as it was accomplished using a three terminal junction box with terminals for live, neutral, and switched live / power to the ceiling light. Earth was provided using a separate cable.
