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Use ferrule to increase solid wire size

Matvey Teplov

Hi,

I need to fit a 3-phase distribution block, and the closest candidate has two types of inputs—input (two) and output (six). The input is 7.6mm2, and the output is 5.6mm2, and one of the inputs can be used as an output. I only use rigid conductors of 1.5-6mm2 in the house - the lights are 1.5, the majority is 2.5, power-hungry is 4mm2, and one fat transit is 6mm2. Depending on the breaker's possible load, I use 4 or 6mm2 inside the wiring closet to pass between the power-hungry groups. I don't use

Within this paradigm, I would like to use 6mm2 as an input and possibly 4mm2 as an output for the distribution block. But, following Legrand's user manual, the 7.6mm2 should accommodate 10 to 25 mm, and I am falling one step short of matching 6mm2. IMHO, I can use aluminum pressed ferrule to increase the solid wire size - the connection surface must be enough to avoid any dangerous situations. What is your take on it?

Regards

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  • Matvey Teplov said:
    I can use aluminum pressed ferrule

    Hopefully NOT aluminium on copper wires and brass terminals - we had awful problem with aluminium conductors in the 1960s and 1970s - I wouldn't advise going down that road. Tin or nickel plated brass or copper maybe.

      I need to fit a 3-phase distribution block

    Just out of curiosity, what's the application? It' not a common problem - normally smaller cables are fed from overcurrent protective devices (MCBs or fuses) rather than from a multiway terminal block (except for N of course, but the DB N bar usually serves that purpose).

       - Andy.

  • in reply to AJJewsbury

    Good morning Andy,

    I have a per level building block that contains all wiring for the specific floor. At the entry, there is a closet where the mains is, are high-amp breakers (some 3 phase and several 1 phase). These all equipped with the differential breaker to watch for the ground leakages. 

    Ground floor uses one phase out of three in a separate box that is connected with 4 sq.mm cable. It is equipped with one 1x16A B, 3x10A B's (light, LED, and comm's), There is one 3 phase 6 sq.mm cable that runs from the main closet to the first floor where it splits leaving one phase untouched (for ground floor as per above), one for the first and one for the top floor. As on the first floor, I have a building block that contains a distribution point and breakers and, as I was wondering, since I have a diff breaker and individual breakers per group, should I have an additional breaker at the floor entry point? Hence, the question about the split block because outputs can be more than four.

    Thank you!

    Regards Matvey

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  • in reply to AJJewsbury

    Good morning Andy,

    I have a per level building block that contains all wiring for the specific floor. At the entry, there is a closet where the mains is, are high-amp breakers (some 3 phase and several 1 phase). These all equipped with the differential breaker to watch for the ground leakages. 

    Ground floor uses one phase out of three in a separate box that is connected with 4 sq.mm cable. It is equipped with one 1x16A B, 3x10A B's (light, LED, and comm's), There is one 3 phase 6 sq.mm cable that runs from the main closet to the first floor where it splits leaving one phase untouched (for ground floor as per above), one for the first and one for the top floor. As on the first floor, I have a building block that contains a distribution point and breakers and, as I was wondering, since I have a diff breaker and individual breakers per group, should I have an additional breaker at the floor entry point? Hence, the question about the split block because outputs can be more than four.

    Thank you!

    Regards Matvey

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