For those not familiar with the Crabtree Safety lamp holder I referred to earlier, I have these photos that I made notes on to help understand what make them safety type. As far as I know, most other lamp holders from other makers now use a small nylon locking screw to help retain the terminal in place. This is needed as many of us will have experienced at some point that when it comes around to removing the lamp shades for cleaning, fitting new ones etc, often the shade ring is hard to unscrew and the terminal cover unscrews exposing the incoming supply. This is less than ideal.
That screw is there because regulations require the use of a tool to gain access to any terminals, but what happens when, if once that screw has been removed and is not refitted, the lamp holder then no meets wiring regulations
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/xfacepalm.gif.pagespeed.ic.EBDwh1hCfo.png)
Crabtree thought at the time these regulations were being drafted, it would a good time to redesign the lamp holder and make it as safe as it could be. I won't go back over what I have already mentioned in previous posts about just how dangerous the humble lamp holder really is, and most people do not appreciate that fact either.
I think the pictures are pretty self-explanatory, but any questions arising, please ask.
![](https://i.imgur.com/ANjGRNHh.jpg)