2391-2 helper thread

[Russ.H]

Hi
I'm doing the 2391-20 carters automotive electronics project and I'm stuck can anyone please help?
I've got a trunking with 13 circuits which has a grouping factor of 0.41 that would make the 32A ring a cable size of 25mm WTF is that about, where am I going wrong?????

 

[IQ Electrical]

If you have any cables that are expected not to carry more than 30% of their grouped rating then these can be ignored when calculating the rating factor for the rest of the group.

Might this help?

 

[brian 2012]

currently doing the 2391-20 design, verification and erection course. wondering if anyone is currently doing the course or has done it in the past? Any examples of past projects, exam pappers or anything that would help with the course in the slightest would be much appreciated. Cant really find much info in past posts!
Thanks guys
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