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

criss20ster 1098 9
Best answers LABEL_AI_GENERATED

What power cable cross-section should I use for the garage subfeed, and is 5×2.5 mm² enough for a C20 circuit?

You cannot determine the cable cross-section from a photo; you need to measure the conductor with a caliper or compare it with a known cable [#21649721] For the existing C20 protection, one reply states that 4 mm² conductors are needed, because the protection is 20 A and the installation should be checked by measuring short-circuit loop impedance to confirm the protection will operate correctly [#21655080] If you only need a 230 V socket in the garage, that can also be installed instead of a full subpanel [#21649768]
AI summary based on the discussion. May contain errors.
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  • Need wire gauge and socket for shed power outlet

    #1 21649629
    criss20ster
    Level 11  
    Posts: 122
    Rate: 6
    And I have this question for you: I need to get the power out under the shed. And consequently, which wire to choose. As far as I can see, I have 4x wires from this box and I just don't know what thickness it is (photo). In addition, what socket needs to be connected to this force so that I can hook up a compressor, pressure washer. The protection I have is C20.
    Interior of an electrical box with four-core cables connected to a terminal block. .

    From the top left corner, the wires come out of the switchboard. Whereas on the left bottom and right side down are the wires going to the power sockets. (Photo)
    Electrical distribution board with cartridge fuses and main switches mounted on a white wall. .
    Moderated By krzysiek7:

    Separated from topic https://www.elektroda.pl/rtvforum/topic3875652.html

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  • #2 21649721
    stanislaw1954
    Level 43  
    Posts: 15245
    Help: 2013
    Rate: 4673
    The thickness of a conductor, or rather its cross-section, as in the power industry the dimension of a conductor is specified in mm2, cannot be determined from a photo. This can be done by measuring the bare conductor with a comb or calliper, or (most simply) by comparing a piece of conductor to a suitable conductor with a known cross-section.
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  • #3 21649753
    criss20ster
    Level 11  
    Posts: 122
    Rate: 6
    Ok. Then I'll measure with a caliper and let you know. Because I was thinking of stepping into the shed of such a building switchboard. Admittedly, I only need a 230 volt socket, but I don't think it's possible to connect the wires from this switchgear as in the wall under the same 230 volt sockets.
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  • #4 21649768
    stanislaw1954
    Level 43  
    Posts: 15245
    Help: 2013
    Rate: 4673
    It's probably worth having power in the garage, but if a 230-volt socket is all you need then you can only do that too.
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  • #5 21655080
    waton

    Level 12  
    Posts: 69
    Help: 6
    Rate: 20
    The fuse you have is a C20, which means the fuse trip current is 20 amps. If you don't have a differential, and I see an old installation, it may be that the protection is too high. You need to take measurements of the short-circuit loop impedance to find out if such protection will work. You need 4 mm² conductors for this 1.45 × 20 = 29 A protection.
    Company Account:
    Waton s.c.
    Siedliska-Kolonia 50, Zamość, 22-400 | Company Website: https://waton.pl

  • Need short-circuit loop impedance measurements

    #6 21655107
    Ktoś_tam
    Level 40  
    Posts: 5366
    Help: 505
    Rate: 2906
    waton wrote:
    The fuse you have is C20, so the fuse trip current is 200A. If you don't have a differential, and I can see the old installation, it may turn out that the protection is too high. You need to take measurements of the short circuit loop impedance to find out if such a protection will work.
    .
    And if there is a differential you can insert more protection than if there is no differential? Interesting.
  • #7 21655122
    waton

    Level 12  
    Posts: 69
    Help: 6
    Rate: 20
    Read in the standard about short-circuit loop impedance measurements for RCD protection and you will get your answer.
    Company Account:
    Waton s.c.
    Siedliska-Kolonia 50, Zamość, 22-400 | Company Website: https://waton.pl
  • #8 21655240
    Wawrzyniec
    Level 38  
    Posts: 4006
    Help: 392
    Rate: 1075
    waton wrote:
    Read in the standard about short circuit loop impedance measurements for RCD protection, you will get the answer
    .
    You probably should change to a more customer-safe industry.
  • #9 21655841
    waton

    Level 12  
    Posts: 69
    Help: 6
    Rate: 20
    PN-HD 60364-6 clause 61.3.6.1 point a) 1) Short circuit loop impedance measurement in Notes !
    If RCD devices with a differential current of <= 500mA are used to switch off the power supply, it is not normally necessary to measure the short circuit loop impedance.

    I understand that reading hurts.
    Company Account:
    Waton s.c.
    Siedliska-Kolonia 50, Zamość, 22-400 | Company Website: https://waton.pl
  • #10 21655987
    elpapiotr
    Electrician specialist  
    Posts: 12210
    Help: 1015
    Rate: 3530
    waton wrote:
    Standard PN-HD 60364-6 clause 61.3.6.1 point a) 1) Measurement of short circuit loop impedance in Notes !
    .
    Shit, I'm looking for this indicated point and can't find it.
    What has happened?
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Topic summary

LABEL_AI_GENERATED
The discussion concerns selecting a power cable and socket for supplying a garage/shed from an existing distribution board protected by a C20 breaker. The conductor cross-section cannot be determined from photos and must be measured directly. For a 20 A overcurrent device, 4 mm² conductors were indicated as appropriate, and the installation should be checked by measuring short-circuit loop impedance to verify that the protection will operate correctly, especially in an older installation without clear RCD/differential protection. The author also asked whether a simple 230 V socket could be connected for loads such as a compressor and pressure washer.
AI summary based on the discussion. May contain errors.
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