Hi, quick question. How do FCU's work? Do they just protect the load side and what I mean is, say you have a ring final with 2.5mm^2 protected by a 20a mcb at the consumer unit and you add a fused spur on that ring de-rated to 3a to supply a 1mm cable for lighting. Now say you start turning on kettles, toasters, microwaves on that ring that pull more than 3a, is that 3a in the fused unit going to pop? Or will it only pop if the load side on the FCU pulls more than 3a?
Just an electrical enthusiast who was watching a video on it and wondered how it actually works.
cheers
Just an electrical enthusiast who was watching a video on it and wondered how it actually works.
cheers