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EN60204 and twin ferrules

Dave in the shed

Hi All,

EN60204 states: "The connection of two or more conductors to one terminal is permitted only in those cases where the terminal is designed for that purpose." Does anybody know whether this prohibits the use of standard twin ferrules (where two wires are crimped into a single ferrule) or whether the assembly of two wires and a ferrule is somehow considered to be a single conductor in the eyes of the standard?

Twin ferrules seem to be commonly used in machine building, often with claims of compliance with 60204. I was expecting to find some easily accessible guidance/knowledge/definitions regarding this situation but my web trawl hasn't found much.

Any wisdom will be gratefully received. Thanks.

  • 0

    I followed this thread with interest, to see how it developed.

    When I first looked at it, I already knew the answer for, at least, Wedimuller DIN terminals - those terminals are, in their data sheet, stated as capable of accepting 2 conductors ... and twin ferrules.

    For example, look at the data sheet for the WD 2.5 terminal often seen in control panels. It is specifically stated that 2 clampable conductors with equal cross-section of either 0.5 sq mm or 1.5 sq mm may be terminated.

    So, in this case, if ferrules are specified (or used - it is, I would have said, de-rigueur for control panels with stranded conductors), a twin ferrule is the only option. But twin-wire ferrules are also specifically stated as acceptable.

    So, for these particular terminals, if anyone raises the question, just fire the data sheet straight back at the client's engineer or witness test attendee.

  • 0

    Graham,

    There is a similar but not quite identical staement in 60079-14 for protection method "e" conductor terminations.

    "

    Now given the fundemental principles of what Exe is and how it achieves safety in a potentially explosive atmosphere, then maybe similar thought for termination of conductors for machinery?  After all are we not trying to achieve a robust and mechanically and electrically sound connection.

    GTB

  • 0 in reply to gkenyon

    Graham,

    Nice bit of relevant data - many thanks. WD2.5's are generally my terminal of choice so doubly nice.

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