I presume they are accurate for AWG and the US - AWG 12 (2.05mm²) 20A.
I presume they are accurate for AWG and the US - AWG 12 (2.05mm²) 20A.
The maximum for 1.5mm² T&E is 20A but it is a different cable and conductor.
I presume they are accurate for AWG and the US - AWG 12 (2.05mm²) 20A.
AWG12 is 2.05mm AWG14 is 2.08mm2, which is what the OP said he had.
Is this cable single or multi core?
No published equation that we are aware of. However, if you look at the second post from me on this page of a recent thread, you will see that the BS7671 (Table 4D5) Method C CCC figures can be closely modelled by:Dont the regs base the values off a certain equation? Either that use the current value inbetween 1.5mm and 2.5mm2.
Perhaps they are inaccurate. I was only going by the first link.I dont think so. I did some digging and found this. 12 gauge is 3.31 mm2. This wire here is 2.08mm2.I presume they are accurate for AWG and the US - AWG 12 (2.05mm²) 20A.
The maximum for 1.5mm² T&E is 20A but it is a different cable and conductor.
No published equation that we are aware of. However, if you look at the second post from me on this page of a recent thread, you will see that the BS7671 (Table 4D5) Method C CCC figures can be closely modelled by:Dont the regs base the values off a certain equation? Either that use the current value inbetween 1.5mm and 2.5mm2.
CCC = 15.774 x CSA^0.6077
... for a 2.08mm² conductor, that would give a (Method C) CCC of about 24.6A. Mind you, I don't know that an inspector or person doing an EICR would accept my modelling, so it might be safer to assume, conservatively, that it's 1.5mm² !!
Kind Regards, John
You're welcome - but, as I said, I'm not sure whether 'third parties' would necessary accept my figuresThanks! That is what I was looking for. I think it does hold some value in my opinion.
Yes, as I said, it's a modelling of (Method C) of Table 4D5 - so, yes, 70°C conductor temperature. If I had the time, I could try modelling Method A. However, looking at Table 4D5, the difference between Method C and Method A is always a factor of between 1.35 and 1.49 (1.38 for 1.5mm² and 1.35 for 2.5mm²), so if you divided the Method C figure by 1.49 (to be safe/conservative) or by 1.38 (based on the 1.5/2.5mm² figures), you wouldn't be far off - so, for 2.08mm² Method A (70°C), that would be about 16.5A (or 17.8A).However this equation only works for clipped direct I take it? What would it be reduced to when using other methods like method A? And the power curve is based on a 70*C conductor operating temperature?
You're welcome - but, as I said, I'm not sure whether 'third parties' would necessary accept my figuresThanks! That is what I was looking for. I think it does hold some value in my opinion.
Yes, as I said, it's a modelling of (Method C) of Table 4D5 - so, yes, 70°C conductor temperature. If I had the time, I could try modelling Method A. However, looking at Table 4D5, the difference between Method C and Method A is always a factor of between 1.35 and 1.49 (1.38 for 1.5mm² and 1.35 for 2.5mm²), so if you divided the Method C figure by 1.49 (to be safe/conservative) or by 1.38 (based on the 1.5/2.5mm² figures), you wouldn't be far off - so, for 2.08mm² Method A (70°C), that would be about 16.5A (or 17.8A).However this equation only works for clipped direct I take it? What would it be reduced to when using other methods like method A? And the power curve is based on a 70*C conductor operating temperature?
Kind Regards, John
Yes, I suppose that's got to be true to some extent, but there's hardly any difference between 1.35 and 1.38, so one might as well 'be conservative'! However, I also suspect that some of the small variation in the de-rating factors (from 1.39 for 1mm² {yes, fractionally higher than 1.5mm² and 2.5mm²} to 1.49 at 16mm²) may be as much to do with rounding as anything else.That makes sense. Now my understanding is the factor is less restrictive for 1.5mm2 because smaller conductors can dissipate heat better? Or is it the other way around? Correct to think that heat dissipation of 2.08mm2 is in between 1.5mm2 and 2.5mm2?
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