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Control panels - connecting different sized wires

John Mann
Hello All,

I usually work with low-current electronics, however we have a sideline in making motor drive systems. It's usually the case that the main phase inputs need to be spurred off (with suitable fusing of course) to power low-current items like fans and 24V PSUs. Usually this can be done with DIN rail terminals, for example the Weidmuller PDU6/10 can take a 10mm. sq. wire. The terminal can then be cross-connected to another, where a 1.5mm wire can attach.  However, what to do when the phase cables get larger and the size difference is greater than a terminal can accomodate?  We could daisy-chain down through a series of terminals but this seems inelegant. Is there a way this is commonly done in control panels?

Thanks,

John.
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  • Former Community Member
    0 Former Community Member
    Robert,

    Yes that is true of BS 7671, however, machinery controls are excluded by virtue of 110.2, xi.

    He machinery electrical standard has something similar, but both, allow a short distance reduction in cross sectional area to be protected against overload at the downstream end of the wiring, as long as the short term fault current is protected against upstream end.

    Machinery wiring standards also require that the maximum fault energy at connected devices is controlled & limited by the upstream circuit protection, especially for compliance with the requirements for elimination of common cause failures in safety systems.
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  • Former Community Member
    0 Former Community Member
    Robert,

    Yes that is true of BS 7671, however, machinery controls are excluded by virtue of 110.2, xi.

    He machinery electrical standard has something similar, but both, allow a short distance reduction in cross sectional area to be protected against overload at the downstream end of the wiring, as long as the short term fault current is protected against upstream end.

    Machinery wiring standards also require that the maximum fault energy at connected devices is controlled & limited by the upstream circuit protection, especially for compliance with the requirements for elimination of common cause failures in safety systems.
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