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adiabatic equation - 2.5 2c SWA

Stewart Mason
I don't get involved with adiabatic equations all to often, hence I'm a bit rusty! I'm trying to calculate the R1+R2 for a 2 core 2.5mm SWA. Obviously the R1 is the easy bit, I'm struggling with the SWA as the R2.  I saw a link to a table on the old forum but I can't find it now. Any ideas?


Thanks Stewart
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  • 0
    Nope.


    What are you getting at?


    This particular example hasn't been stated as low fault level, so we must assume 16 kA (and 0.35 omega Ze) - of course could be higher fault level if larger supply than the standard 100 A.


    As I stated, it's not the fault level at the end of the cable that's important, it's the fault level at the start of the cable.


    However, no para in EIDG still says the same thing.


    I'm sure someone will point out that "in many houses the fault level is below 3 kA" - well, it's not in mine, which is often over 6 kA, and I'm over half way down our street from the substation.
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  • 0
    Nope.


    What are you getting at?


    This particular example hasn't been stated as low fault level, so we must assume 16 kA (and 0.35 omega Ze) - of course could be higher fault level if larger supply than the standard 100 A.


    As I stated, it's not the fault level at the end of the cable that's important, it's the fault level at the start of the cable.


    However, no para in EIDG still says the same thing.


    I'm sure someone will point out that "in many houses the fault level is below 3 kA" - well, it's not in mine, which is often over 6 kA, and I'm over half way down our street from the substation.
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