Inside a lamp post connection and cut-out unit.

This is a very good example of something that has been designed with function in mind. It's a robust connection point that allows easy termination of cables in a lamp post with an HRC fuse suited to the potential high fault current that can occur, and a large integrated finger guard on the fuse holder. John Ward has a video showing a dual fuse unit with phase and neutral isolation here:-    • Bill Street Lighting Cutout SL3D2   The most important thing to know about these units is that you must ONLY use the correct type of fuse. Many posts are fed directly from a utility company supply cable and the potential fault current in the event of a short circuit from phase to neutral or ground is measured in thousands of amps. Never replace the fuse with a bit of wire, foil or an unsuitable fuse. My dislike for traditional wire armour glands is down to terminating a lot of them in the past. Often with several staggered rows entering a control panel. Even if the glands are all tightened in before the cables are inserted, the act of tightening the collar to grip the armour often creates a slight twist in the armour and upon release it can loosen the gland. Especially when dressing the cables into ladder or tray. The flat internal nuts are just so unsuited to the purpose. Pre-rounded edges and nothing to really bite or grip when tightened. I'm quite fond of street lighting stuff. Not so much when it's pouring with rain in winter, but cherrypickers/bucket trucks/van mounts are pretty much all big boys toys. And not too many "safety officers" due to the unglamorous nature of the work. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.