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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

  • in reply to mapj1

    Good moring Mike,

    Don't kick me too much - I am not a professional installer and didn't think of folding these ;-) I have followed your advice with the double backing - it worked like a charm. The one on the left is six sqm, and the one on the right is four sqm. Thank you!

    Regards Matvey

    Block

  • 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

  • in reply to Matvey Teplov

    Please don't think I'm 'kicking' you - it can be hard to judge the level of someones knowledge right just by their typing -  especially when things are posted by folk in other countries and may be  not in the Mother tongue. (In reverse, I can do some German but the result can be pretty lumpy.)

    Something obvious to you may not be so obvious to me or the other way about


    That photo looks pretty solid, & as I imagined it is now impossible for the wire to  slide up the side of the screw.- I presume it survives the ' wiggle & pull' unofficial test as well. I also assume you won't be mixing earth and neutral colours in the real thing.;-)

    Mike.

    Ps As general note, it is far better to ask the 'silly' questions early on, it  is how we learn, and it is a lot sillier not to ask and to assume the wrong thing and have to do the job twice.

  • in reply to mapj1

    Mike,

    These were just two short wires around that I took for the purpose of demonstration. Thank you for your answers and verification!

    Cheers

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