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

criss20ster 291 9
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  • #1 21649629
    criss20ster
    Level 10  
    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  
    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 10  
    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.
  • #4 21649768
    stanislaw1954
    Level 43  
    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  
    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.
  • #6 21655107
    Ktoś_tam
    Level 39  
    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.
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  • #7 21655122
    waton

    Level 12  
    Read in the standard about short-circuit loop impedance measurements for RCD protection and you will get your answer.
  • #8 21655240
    Wawrzyniec
    Level 38  
    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  
    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.
  • #10 21655987
    elpapiotr
    Electrician specialist  
    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

The discussion addresses the selection of an appropriate power cable for supplying electricity under a shed or garage, specifically questioning if a 5x2.5 mm² cable is sufficient. The user has a C20 circuit breaker and intends to power 230 V sockets for devices such as a compressor and pressure washer. Determining the conductor cross-section from photos is unreliable; accurate measurement requires a caliper or comparison with a known conductor. The user considers installing a building switchboard in the shed but questions compatibility with existing wiring. It is noted that if only 230 V sockets are needed, the installation can be simplified accordingly.
Summary generated by the language model.
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