Are ferrules recommended with stranded wire on a fused spur?

[adrian_ros]

Hello. Are ferrules recommended or strongly recommnded when connecting stranded wired to a fused spur like the one in the picture below?
I think ferrules are not mandatory for this type of connections in UK, but would like to know whether one should go the extra length and use them.
I am connecting a 1500W heater to the spur.
Thanks!

 

[ericmark]

If the terminal has a pad of some sort, so the screw does not directly contact the wire, then no need, other than to hold any wire label in place, but if the screw directly contacts the wire, then to stop a filament binding screw, using a feral is a good idea. As to maintenance free, yes really should use a feral, as wires can jam and leave filaments behind so not correct pressure on the wire.

I don't like torque screwdrivers, as you can't feel when a filament has jammed the terminal, or anything else is binding the screw, and with ferals we rely on selecting the connect jaw, in the main the terminal screw will crush the feral so even if wrong jaw used no problem, but with maintenance free terminals wrong size feral or tool/jaw can result in a slack connection, I worked with one firm who calibrated the crimp pliers (GEC) but that is the only one who did, so it is so easy with an over centre crimp tool to select the wrong point in the jaw, or wrong jaw, with GEC we never had multi-size crimp tools, one of orange, one for red, one for blue, and one for yellow, so carrying 4 crimp tools instead of one universal tool, pain in the neck.

 

[ebee]

I dont usuallly use ferrules but when using flex then a good bit of neat twisting and doubling, in an ideal world any conductor should, in theory, be made to fill the (round tunnel type ?) terminal to get maximum contact area and a good mechincal joint, ferrules can go a long way towards achieving this aim, another trick might be to twist and maybe double a time or two hold tightly then a good solder joint.