Grouping rating factor (Cg)

Grouping rating factor used for calculatingminimum required cable size. For cables installed in air, values for this factor are given BS7671:2018,Tables4C1,4C4,4C6.For ground installations, values are given in Table4C2. Grouping a circuit with others will result in a lower rating factor Cg. Thismay result in an increased cable size.

ISO 19650 Framework Components Relationship diagram linking OIR, AIR, PIR, EIR, AIM, PIM, BEP, MIDP and TIDP within the CDE
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Jarek Wityk

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