Mullardman
Moderately extreme...
I'm fitting a 'bulkhead light' on the side of the house. I'm powering it as a 'spur' from a power socket in the integral garage..via a Fused Connection Unit fitted with a 3A fuse. This because picking up a supply from anywhere on the lighting circuits would be very messy.
So it is 13A power socket via 2.5mm flat twin and earth to Fused Control Unit with 3A fuse, via 1.0mm flat twin and earth to 5A junction box and with 'live' taken via a wall mounted switch (through the wall in the dining room) to the bulkhead light ..on the outside wall.
All the usual safety.. earth sleeving.. red tags on the black/blue 'return' from switches etc. will be observed..
However.. what is foxing me is which terminal to use for what in the FCU?
All the pics of FCUs I've seen have clearly marked 'Mains' and 'Load' terminals... giving the impression that this distinction matters. The one I purchased has no internal labelling, but is well made and supplied by Screwfix.
After some puzzlement, I established that both Neutral terminals are 'commoned' via a brass 'bus'.
Both Live terminals as you'd expect.. sit either side of the fuse.
So... does it actually matter which Live terminal the supply and load are connected to? I can't see how it does.. Am I missing something?
So it is 13A power socket via 2.5mm flat twin and earth to Fused Control Unit with 3A fuse, via 1.0mm flat twin and earth to 5A junction box and with 'live' taken via a wall mounted switch (through the wall in the dining room) to the bulkhead light ..on the outside wall.
All the usual safety.. earth sleeving.. red tags on the black/blue 'return' from switches etc. will be observed..
However.. what is foxing me is which terminal to use for what in the FCU?
All the pics of FCUs I've seen have clearly marked 'Mains' and 'Load' terminals... giving the impression that this distinction matters. The one I purchased has no internal labelling, but is well made and supplied by Screwfix.
After some puzzlement, I established that both Neutral terminals are 'commoned' via a brass 'bus'.
Both Live terminals as you'd expect.. sit either side of the fuse.
So... does it actually matter which Live terminal the supply and load are connected to? I can't see how it does.. Am I missing something?