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Crimping makes a connection reliable enough to be permanently buried. A good crimping tool is needed, cheap non-ratchet pliers don't make an acceptable joint. See crimp. An FCU (fused connection unit) does more than just connect wires together. They're used where a fuse and cordgrip are needed, ie when connecting an appliance flex to fixed wiring. They come in 2 and 3 pin versions. 2 pin connectors must not be used on 3 core appliances. There are also a few different pin configurations that have seen popular use over the years, so not all connectors are compatible with others. Many such connectors are only rated at 5A, a 5A connector is good for a 1kW motor. Flex ends need twisting and folding over before use, and should not go in the same hole as cable, or the flex connection can be weak and electrically inadequate. Lone cables going into a connector terminal are bent double to ensure good grip.
Soldering isn't a popular option for fixed wiring because of these issues, and because soldering takes some equipment and skill. There's also no readily available junction box designed for soldering. Its a good enough option if you've got the skill to do the job properly, but if not, other joint types would be better. If a mains cable needs to be joined underground, the joint must be totally waterproof long term. The only realistic way to achieve this is to place the connection in a plastic housing, and fill it with resin. Suitable resin filled connector kits are available. Underground electricity distribution uses the same connectors in a larger size.
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Crimped flex ends can be safely used in mains plugs and other screw connectors. Ideally the flex should be twisted before the bootlace ferrule is applied, to avoid concentrating stresses on a small number of strands. Soldered wires should not be put into screw connections, the 2 aren't a safe combination. The first problem is that solder is soft and tends to creep under screw pressure, leaving a weakly clamped joint after a while. The other is that the soldering of stranded wire makes strands more likely to break. Soldering screwed wires increases the odds of fault& fire.
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