Design Current and Current Carrying Capacity Calculations
Design Current and Calculation of the Minimum Required Value of the Cable's Current Carrying Capacity General For ring socket circuit with Ιn = 30Α or 32Α
Grouped circuits not liable to General motor circuits StarDelta Motor Circuits With:
Criteria for type gG fuses  Comply with the IEC Standard requirement I2 ≤ 1.45 Iz: As per the IEC standard, the condition I_{2} ≤ 1.45 Iz must be taken into account, where I_{2} is the fusing (melting level) current, equal to k2 x In (k2 ranges from 1.6 to 1.9) depending on the particular fuse concerned. In such a case an extra factor k3 = 1.31 for fuses with In < 16A , or k3 = 1.1 for fuses with In ≥ 16A is considered, in order that I_{2} ≤ 1.45 Iz will be valid if In ≤ Iz/k3. 
Checks With:
