Innovating Electrical Engineering Calculations

  Breaker Size : Example: Design Current for the R-TPN Load of Max 10 KW value is 20.89 A We need to select the Next Higher size of Breaker available in the Market for Calculated Design Current (=20.89 A) Here In our Case 30/32 A breaker can be selected. It can be MCCB or MCB or RCBO depending upon requirements. Ib = 21 A In = 30 A Iz = 52.48 (From Cable Data) Note: The operating characteristics of a device protecting a conductor against overload shall satisfy the following two conditions: Ib <= In <= Iz I2 <= 1.45 Iz Ib = the current for which the circuit is designed, e.g. maximum demand In = the nominal current of the protective device Iz = the continuous current-carrying capacity of the conductor (see the AS/NZS 3008.1) I2 = the current ensuring the effective operation of the protective device and may be taken as equal to either— (a) the operating current in conventional time for circuit breakers (1.45 In); or (b) the fusing current in conventional time for fuses (1...

  VBA ADDIN FOR ELECTRICAL CALCULATIONS Functions accessible in Excel : fx = CableTraySize( ) fx = CONTAINMENT( ) fx = EARTHING( ) fx = FAULTCURRENT( ) fx = kVA( ) fx = LLMF( ) fx = LMF( ) fx = LSF( ) fx = RSMF( ) fx = say( ) fx = TRCURRENT( ) fx = Z_CABLE( ) fx = Z_Transformer( ) fx = CABLE( ) fx = CURRENT( ) fx = MCCB( ) fx = SHORTCIR( ) fx = VDrop( )