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Using Connection Strip with Ferrules

Former Community Member
Former Community Member
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When connecting flexible wires using connection strip with screws  it is recommended that one uses cord end sleeves or ferrules. What I realized if I connect two ferrules (1 In and 1 Out) the Insulation Jacket of ferules will not sufficiently enter the hole . and installation will end up as the attached figure. I am wondering if such connection is acceptable.

Note: in most cases I have 2x2.5mm2  Flex Wires In using Twin Ferrule and 1x2.5mm2 Flex wires out using single ferrule and I am using 10mm2 Connection strip

Another question is it acceptable to cut a little bit from the crimped ferrules so that they will enter sufficiently.
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    I want to know if there is a mandatory regulation in BS standard other than BS EN 60079 (explosive atmosphere) that mandates the use of ferrules for IEC 60288 Class 2(Stranded), Class 5 and class 6(Finely Stranded) conductors.(Inside Panel Boards and in Junction boxes)



     



    For things covered by BS 7671 (there are different standards for the wiring of 'machines' etc.) there's no specific demand for ferrules but there is general demand for 'multiwire', 'fine wire' and 'very fine wire' for the conductor to be "suitably treated" to avoid the inappropriate spreading of the individual wires (regulation 529.9.1). Depending on the situation and type of terminal, that allows for any number of options - in some cases just twisting the strands might be sufficient - in other cases ferrules would seem a better choice. With some terminals it might be that the strands can spread but are still held properly in the terminal - so nothing at all might be needed. The only method that's specifically mentioned is the soldering (tinning) of the ends of fine and very-fine wires - which is prohibited when using screw terminals are used or where there can be movement between the soldered and unsoldered parts of the conductor (regs 529.9.2 and 529.9.3)


       - Andy.

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    I want to know if there is a mandatory regulation in BS standard other than BS EN 60079 (explosive atmosphere) that mandates the use of ferrules for IEC 60288 Class 2(Stranded), Class 5 and class 6(Finely Stranded) conductors.(Inside Panel Boards and in Junction boxes)



     



    For things covered by BS 7671 (there are different standards for the wiring of 'machines' etc.) there's no specific demand for ferrules but there is general demand for 'multiwire', 'fine wire' and 'very fine wire' for the conductor to be "suitably treated" to avoid the inappropriate spreading of the individual wires (regulation 529.9.1). Depending on the situation and type of terminal, that allows for any number of options - in some cases just twisting the strands might be sufficient - in other cases ferrules would seem a better choice. With some terminals it might be that the strands can spread but are still held properly in the terminal - so nothing at all might be needed. The only method that's specifically mentioned is the soldering (tinning) of the ends of fine and very-fine wires - which is prohibited when using screw terminals are used or where there can be movement between the soldered and unsoldered parts of the conductor (regs 529.9.2 and 529.9.3)


       - Andy.

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