adiabatic equation - 2.5 2c SWA

Stewart Mason over 5 years ago

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 Chris Pearson over 5 years ago

gkenyon:

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.

Yes, but how long is your street? And what size is the transformer?

We are at no. 1 and even though the transformer (300 kVA) is nearly at the other end of the street, which means that the JB is about 200 m away from the transformer, PFC is only about 1 kA.
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0 Chris Pearson over 5 years ago

gkenyon:

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.

Yes, but how long is your street? And what size is the transformer?

We are at no. 1 and even though the transformer (300 kVA) is nearly at the other end of the street, which means that the JB is about 200 m away from the transformer, PFC is only about 1 kA.
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adiabatic equation - 2.5 2c SWA

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