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Which power cable should I choose for the garage and is 5x2.5 enough?

luk009 48744 17
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Can I use 5x2.5 mm² cable for garage sockets, or should I choose a thicker cable?

Yes, 5x2.5 mm² is enough for about 12 m of run with 16 A protection, but if you want more reserve for future loads, 5x4 mm² is the safer choice. One recommendation was to run a new YKY 5x4 mm² cable directly from the board to the second garage, rather than branching through the first garage, and to keep the whole run the same cross-section [#19907828][#19917496] Another reply confirmed that 5x2.5 mm² + 16 A protection is sufficient at 12 m, and even reported a 30 m run in 4x2.5 mm² handling a MIG 180 A welder plus 2.5 kW machines without problems [#19908140] A thicker cable itself does not cause a problem; the main point is that a thinner cable upstream limits the benefit of the thicker section [#19917496]
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  • #1 19906645
    luk009
    Level 5  
    Posts: 71
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    Hello. I searched a lot but I can't find it.
    I'm doing a new installation in the garage and I have a related question. What kind of cable should I put in the garage, I mean the cable in the garage, the cable from the switchboard in the garage to the power socket? Is 5x2.5 enough? I don't know what I will use at the moment... Sometimes a circular circuit is connected.
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  • #3 19906679
    karolark
    Level 42  
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    What is the cable length?
  • #4 19906769
    luk009
    Level 5  
    Posts: 71
    Rate: 4
    Which power cable should I choose for the garage and is 5x2.5 enough?

    I have a C25 at home, a C16 in garage no. 1 (I can always modify it) and in garage no. 2 I am also planning to build a switchboard and from there to the furthest power socket there will be about 24 m of cable. I am thinking of making two power sockets in the garage, the first one at a distance of about 9 m from the switchgear and from the first one to the second one 15 m. As I wrote that I am making new cables and I don't know what the load will be, at the moment a circular circuit is sometimes connected (not I know what engine power. The garage will be used for private, non-industrial purposes, so maybe there will be a forced welding machine, etc.
  • #5 19907008
    krzysiek7
    Moderator of Electricians group
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    How many conductors and what cross-sections do the cables supplying these garages have?
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  • #6 19907270
    atrix55
    Level 26  
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    krzysiek7 wrote:
    How many conductors and what cross-sections do the cables supplying these garages have?


    He wrote that he wanted to give 5 x 2.5 mm.

    How long will the power line be and what will the total load of the receivers be?
    What protections are available on the 16 A or 32 A electrical connection?
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  • #7 19907292
    Krzysztof Reszka
    VIP Meritorious for electroda.pl
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    atrix55 wrote:
    He wrote that he wanted to give 5 x 2.5 mm.

    To garage no. 2, and my friend asked about garage 1 what cable he has, because it will power the second garage, logical.
    atrix55 wrote:
    What protections are available on the 16 A or 32 A electrical connection?

    luk009 wrote:
    I have C25 at home and C16 in garage no
  • #8 19907310
    krzysiek7
    Moderator of Electricians group
    Posts: 4835
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    atrix55 wrote:
    krzysiek7 wrote:
    How many conductors and what cross-sections do the cables supplying these garages have?


    He wrote that he wanted to give 5 x 2.5 mm.

    I know what he wrote, I asked about what he didn't write.

    luk009 wrote:
    I searched a lot but I can't find it.
    I'm doing a new installation in the garage and the question is which cable to put in the garage I mean the cable in the garage, running the cable from the switchboard in the garage to the power socket? Is 5x2.5 enough?
  • #9 19907340
    atrix55
    Level 26  
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    In such a case, a cross-section of 2.5 mm is sufficient and the protection should be graduated. Well, 16 A and it will be OK.
  • #10 19907358
    karolark
    Level 42  
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    atrix55 wrote:
    In such a case, a cross-section of 2.5 mm is sufficient and the protection should be graduated. Well, 16 A and it will be OK.

    Is it enough or not?
    The author does not know what the load, gradation and selectivity will be?
  • #11 19907801
    luk009
    Level 5  
    Posts: 71
    Rate: 4
    Maybe I will write more details that I learned and realized, so: From the board at home Es C25 - 3 fields. A 4x2.5 cable (about 6 m) goes to the box outside the house, and from there, from the box, a 4x4 cable (about 22 m) goes underground to the box in Garage No. 1, and here Es C16 - 3 poles, then from the box to Garage No. 2, a cable goes hanging 4x4 (about 12 m) and I want to make a box in garage No. 2 and insert Es, and I mean a power cable. I want to make two power sockets, the first one at a distance from the box about 9 m and a connection in this socket and then after about 15 m the second power socket, i.e. the furthest from the box about 24 m. I am also thinking about connecting the cables directly in the box in Garage No. 1, i.e. in front of In garage no. 2, make an earth connection to garage no. 2, i.e. insert an additional fifth cable and boards with ess there... And my question is, among other things, about the cable with which I will distribute the power on the walls from this board in garage no. 2 for the force sockets, which one to insert and can it be 5x2.5 or thicker?

    What kind of load is he planning, I haven't planned anything yet... At the moment, the only thing I'm using is a circular saw (I have no idea what engine it has), some kind of power welding machine, etc... But you know, I'm also wondering if I would modernize the installation someday (because it would be need), i.e. from garage No. 2 towards the house, at least garage No. 2 should have appropriate cables and then only the cables in the ground should be changed.
  • #12 19907828
    Krzysztof Reszka
    VIP Meritorious for electroda.pl
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    Buddy, run a new YKY 5X 4 mm cable? from the board straight to the second garage. Only a small inverter welder will work on this cable rosary.
  • #13 19908140
    atrix55
    Level 26  
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    Krzysztof Reszka wrote:
    Buddy, run the new YKY 5X × 4 mm cable? from the board straight to the second garage. Only a small inverter welder will work on this cable rosary.



    You can also 5 x 4 mm
    At 12 m, 5 x 2.5 mm + 16 A protection is enough

    I have about 30 mb buried in 4 x 2.5 mm and I run Mig 180 A without any problems. Lathe, drill - 2.5 kW engines
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  • #14 19908277
    Krzysztof Reszka
    VIP Meritorious for electroda.pl
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    atrix55 wrote:
    At 12 mb it's enough

    Buddy, did you read my post?
    Krzysztof Reszka wrote:
    from the board straight to the second garage.

    After all, you may not have noticed that;
    luk009 wrote:
    There is a 4x2.5 cable going to the house

    luk009 wrote:
    there is a 4x4 hanging cable
  • #15 19917475
    luk009
    Level 5  
    Posts: 71
    Rate: 4
    And let me ask you this. If I use a cable, e.g. 5x4, i.e. thicker, could there be something wrong, i.e. too thick, some voltage drop or something like that? Even if the previous cable that will power this 5x4 cable is thinner, does anything interfere with it?
  • #16 19917496
    Krzysztof Reszka
    VIP Meritorious for electroda.pl
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    luk009 wrote:
    If I use a cable, e.g. 5x4, i.e. thicker, could there be something wrong, i.e. too thick, some voltage drop or something like that? Even if the previous cable that will power this 5x4 cable is thinner, does anything interfere with it?

    Krzysztof Reszka wrote:
    Buddy, run a new YKY 5X 4 mm cable? from the board straight to the second garage

    It doesn't pose any threat, but what's the point of using a thicker cable if there's a thinner one in front of it? So the option I gave you is the best, put a 5x4 mm2 cable all the way from the board to the new garage, wrapping around the first garage. Always think ahead and with a certain reserve of power that comes from a thicker cable and all of the same cross-section.
  • #17 19917942
    CYRUS2
    Level 43  
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    Times will change.
    You should consider charging an electric car.
  • #18 19918091
    luk009
    Level 5  
    Posts: 71
    Rate: 4
    Krzysztof Reszka wrote:
    So the option I gave you is the best, put a 5x4 mm2 cable all the way from the board to the new garage, wrapping around the first garage. Always think ahead and with a certain reserve of power that comes from a thicker cable and all of the same cross-section.


    At the moment I am putting new cables in garage no. 2 inside, especially about strength? I can't change the outside, i.e. the entrance, at the moment and it has to stay that way for some time, I mean, if I add 5x4, will it not interfere with anything? In this installation that is now there, i.e. access to the garage?

Topic summary

✨ The discussion revolves around selecting the appropriate power cable for a garage installation, specifically questioning whether a 5x2.5 mm cable is sufficient. Key considerations include the length of the cable run (approximately 24 m total), potential loads (including a circular circuit and possibly a welding machine), and existing circuit protections (C16 and C25). Responses suggest that a 5x2.5 mm cable may be adequate for the current needs, but a thicker 5x4 mm cable is recommended for future-proofing and accommodating higher loads. Concerns about voltage drop with thicker cables were addressed, indicating that using a thicker cable does not pose risks but may be unnecessary if the upstream cable is thinner. The conversation emphasizes planning for potential future electrical demands, such as electric vehicle charging.
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FAQ

TL;DR: For garage “si42a”, experts advise "run a new YKY 5x4 mm cable straight to the second garage"; 5x4 mmb2 gives headroom. Choose graded breakers and avoid bottlenecks by bypassing Garage 1. [Elektroda, Krzysztof Reszka, post #19907828] Why it matters: It helps DIYers and installers choose safe, future02proof cable sizes and protections for garage three02phase sockets.

Quick Facts

What27s the recommended cable for a garage three02phase (si42a) socket?

The thread27s consensus tip is a new YKY 5x4 mmb2 run straight from the main board to Garage 2. This avoids bottlenecks through Garage 1 and leaves capacity headroom. One expert notes only a small inverter welder will work on this setup, so plan loads accordingly. [Elektroda, Krzysztof Reszka, post #19907828]

Is 5x2.5 mmb2 enough for a three02phase socket?

Yes, for a short run protected at 16 A and with moderate loads. As one reply put it, "the protection should be graduated... 16 A and it will be OK." Keep loads aligned with the breaker and cable rating. [Elektroda, atrix55, post #19907340]

What breaker should protect a 5x2.5 mmb2 circuit?

Use a 16 A breaker and grade protections from the upstream device for selectivity. This matches typical 5x2.5 mmb2 guidance provided in the thread. Do not oversize the breaker beyond the cable27s capacity. [Elektroda, atrix55, post #19907340]

When should I choose 5x4 mmb2 instead of 5x2.5 mmb2?

Choose 5x4 mmb2 when you want reserve for welders or future upgrades, or when the run length and voltage drop matter more. The advice given was to run 5x4 mmb2 directly from the main board to Garage 2. This simplifies selectivity and expansion later. [Elektroda, Krzysztof Reszka, post #19907828]

Can I install a thicker cable after a thinner feeder?

Yes. It poses no safety threat, but capacity stays limited by the thinnest upstream section. The strongest recommendation was to replace the entire feeder with 5x4 mmb2 when possible. "Always think ahead and with a certain reserve of power." [Elektroda, Krzysztof Reszka, post #19917496]

Will 5x2.5 mmb2 be OK for about a 12 m run?

Yes. A 12 m run on 5x2.5 mmb2 with 16 A protection was reported as sufficient in the thread. Keep connections tight and verify breaker grading. If loads grow, reassess cable size. [Elektroda, atrix55, post #19908140]

Can I run a welder or MIG on these cables?

A user reports 30 m of 4x2.5 mmb2 running a MIG 180 A, plus lathe and drill with 2.5 kW motors. Quote: "Lathe, drill 02 2.5 kW engines." Results depend on your protection, run length, and duty cycle. [Elektroda, atrix55, post #19908140]

Should Garage 2 be fed directly from the main board?

Yes, if feasible. Feeding Garage 2 directly with 5x4 mmb2 avoids daisy02chain bottlenecks and eases future upgrades. It also simplifies coordination of protections. [Elektroda, Krzysztof Reszka, post #19907828]

Which cable type should I buy for this run?

The recommendation was YKY 5x4 mmb2 for the direct feeder. It27s a robust choice for fixed installations and outdoor routes discussed here. Match accessories and glands to the cable. [Elektroda, Krzysztof Reszka, post #19907828]

How do I size and protect a garage 22si42a22 run (3 steps)?

  1. Estimate load and length; at ~12 m, 5x2.5 mmb2 with 16 A was reported sufficient.
  2. Choose cable with headroom if loads may grow; prefer larger cross02section for long runs.
  3. Grade protections (e.g., 16 A downstream) to coordinate with the upstream breaker. [Elektroda, atrix55, post #19908140]

I can27t replace the outside feeder now04can I still rewire inside Garage 2 with 5x4 mmb2?

Yes. Upgrading the internal wiring to 5x4 mmb2 does not create safety issues. However, the thinnest upstream section still limits your usable capacity. Plan a full02length 5x4 mmb2 replacement when possible. [Elektroda, Krzysztof Reszka, post #19917496]

How should I lay out two sockets about 9 m and 15 m from the box?

Your plan forms a radial: about 9 m to the first socket, then ~15 m to the second (total ~24 m). Keep consistent cross02section along the run and coordinate protection at the source. Confirm loads you intend to use on the far socket. [Elektroda, luk009, post #19906769]

How do I future02proof for EV charging or other big loads?

Reserve feeder capacity early and keep routing simple for a later upgrade. One participant cautioned, "Times will change. You should consider charging an electric car." If EVs are likely, plan a higher02capacity feeder path. [Elektroda, CYRUS2, post #19917942]

What does 22graduation/selectivity22 mean for my breakers here?

Gradation means using smaller ratings downstream so local faults trip the local breaker first. In the thread, 16 A downstream protection with 5x2.5 mmb2 was advised under this principle. This helps keep upstream breakers on during minor faults. [Elektroda, atrix55, post #19907340]
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