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Thread: Cable sizing for a stove.

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    Cable sizing for a stove.

    Hi All,

    Kindly see the 3 attached document, what are your thought?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    They tell you what cable is suitable although my personal preference would be H07RNF which is the uprated neoprene version. I don't see any reason not to follow their recommended size.
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    Quote Originally Posted by AndyD View Post
    They tell you what cable is suitable although my personal preference would be H07RNF which is the uprated neoprene version. I don't see any reason not to follow their recommended size.
    As long as the cable is protected correctly with a 20 amp circuit breaker and not the recommended 25amp
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    Quote Originally Posted by AndyD View Post
    They tell you what cable is suitable although my personal preference would be H07RNF which is the uprated neoprene version. I don't see any reason not to follow their recommended size.
    Hi AndyD, thank you for the reply. Did you view the PDF document attached together with these 2 pictures? I would like to hear your response and view on my question and analysis respectively.

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    Quote Originally Posted by Leecatt View Post
    As long as the cable is protected correctly with a 20 amp circuit breaker and not the recommended 25amp
    Hi Leecatt,

    Thank you for your input on the subject matter. I assume your response is based on the burners alone, the burners when they are all operated to maximum at the same time they can draw a maximum current of 25 A. In your recommendation you recommend a 2,5mm2 Cable and a 20A C/B wouldn't this breaker trip when all the burners are turned on to maximum?

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    Quote Originally Posted by @SamboLindoh View Post
    Hi Leecatt,

    Thank you for your input on the subject matter. I assume your response is based on the burners alone, the burners when they are all operated to maximum at the same time they can draw a maximum current of 25 A. In your recommendation you recommend a 2,5mm2 Cable and a 20A C/B wouldn't this breaker trip when all the burners are turned on to maximum?
    I am not taking the load into account at all.
    My concern is simply for the amperage in the cable. Protecting a 2.5mm cable with a 25 amp circuit breaker is incorrect. The maximum rating in the cable is 23 amps, therefore the recommendation to use a 20 amp circuit breaker to protect it.

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    Diamond Member AndyD's Avatar
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    These types of trailing cables are fine stranded conductors plus the CPC is the same CSA as the line conductors and the insulation has a higher temperature rating than standard PVC so they carry a relatively higher current rating than PVC installation cables with solid conductors like flat twin. 2.5mm 3-core H07 for example is usually rated at 25Amps. Data sheet attached below, see page 4.

    I'd personally follow the manufacturers recommendations regarding cable size and overcurrent protection.

    h07rn-f-bs-en-50525-2-21-flexible-rubber-cable.pdf
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    The load of the stove is limited to 3.4 kw (about 15A depending on the actual voltage) at any given time. There will be a mechanism inside the stove to prevent all the elements running simultaneously.
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    Quote Originally Posted by Leecatt View Post
    I am not taking the load into account at all.
    My concern is simply for the amperage in the cable. Protecting a 2.5mm cable with a 25 amp circuit breaker is incorrect. The maximum rating in the cable is 23 amps, therefore the recommendation to use a 20 amp circuit breaker to protect it.

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    Hi Leecatt,

    In my opinion I wouldn't say using a 25A circuit breaker for a 2.5mm2 cable is incorrect. The maximum protection rating for a 2.5mm2 is indeed 25A. The maximum amount of current that a cable can handle depends on various factors such as the method of installation (Pg 89), the length of the cable, the type of cable (i.e single core,multicore, PVC, armoured, unarmoured, copper,aluminum, etc) see. table 6.2(a), table 6.3(a) and table 6.4(a)....SANS 10142-1

    Please see the attached pdf document and go through the analysis of the scenario there, I would appreciate your comment on the analysis there.

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    You are correct the max rating depends upon the installation method.
    According to your diagram the cable is a 2.5mm twin core and earth and is to be installed into conduit on a wall.
    This means I have to refer to table 6.2(a), installation method 2.
    The maximum current is limited to 24 amps.
    In my world this requires a 20 amp circuit breaker for protection not a a 25 amp.




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