Discuss What does “suitably treated” mean in regulation 526.9.1 in the UK Electrical Forum area at ElectriciansForums.net
Hi and welcome to the forum.
That reg deals with a variety of termination methods, not just ferrule / no ferrule situations. Looking at the need for ferrules, it would depend on the terminal. If it is of a design that is likely to shear off some of the strands of a fine-stranded conductor, e.g. with the tip of a screw that is neither rounded nor has a protection spring, then I would consider a ferrule more or less essential. The same where there is a high chance of the twisted bundle of strands being flattened and partially squeezed out from underneath the screw, e.g. some types of barrier strip. OTOH if the terminal is somewhat more kind to the conductor and doesn't threaten to eject it, then the ferrule might be desirable but non-essential.
Other suitable treatments include the strand-welding used on the ends some CU internal jumper cables and similar, there's no ferrule but the strands have been consolidated into a solid block. Also crimp pins, which are better suited to situations where the conductor might have to be repeatedly removed and refitted (ferrules tend to wear through or split).
IMO BS7671 is not an instruction book on how to carry out electrical craftsmanship. It merely sets out minimum standards below which work is not acceptable. I wire according to good technical craft practice and would consider that any termination I make will be sound and durable and therefore acceptable BS7671, whatever the detail wording of the reg happens to be.
Usually the regs would say to check the manufacturer's instructions as to what cables are suitable. For cheap and simple screw blocks, etc, you will probably not find any instructions!I was mainly questioning finely stranded 0.75-1.5mm flex to be terminated in a screw type terminal, personally...
Reply to What does “suitably treated” mean in regulation 526.9.1 in the UK Electrical Forum area at ElectriciansForums.net
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