Cs - Thermal resistance of soil., Cd - For depth of burial , Cf - Where the protective device is a semi-enclosed fuse to BS 3036, This equals 0.725 otherwise this equals 1, Ca - Ambient or surrounding temperature correction , Ci - The factor to be used when enclosed in thermal insulation , Cg - Grouping correction factor given in tables on the regs book ,

Correction Factors

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