ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Lampholders dangling from the ceiling

I've taken the liberty to include two photos taken from an earlier posting made by Paul.




As you can see, the outer shell of the bulb will connect at roughly the same time as the center. Thus, polarization is unneeded. Even 1920's lampholders are made like this. (Those are made of metal and porcelain)

I fail to see why you would want to have a design where the screw "shell" of the lampholder is connected to anything. The only reason I can think is the approval agency cynically keeping the number of electrocutions up to justify their existance.

European lampholders have a "mushroom" of soft plastic in the bottom, beneath the wire terminals. This prevents energizing the metal "nut" at the bottom in case a wire comes loose. (Although the lampholder is made of plastic, the nut is still metal, and looks similar to the one in Sven's top picture)



For some reason, strain reliefs are plastic.



I've never seen a new turn knob lampholder. They are commonly found on old holders. Today you will find ordinary switches on the holders. (Most lampholders lack switch, though)



Sven, those IKEA things you mention: Do you mean something like this?



[This message has been edited by C-H (edited 11-24-2002).]