Define the system grounding arrangement (TT, TN-S, or TN-C-S) and input the measured or declared Zecap Z sub e and Prospective Short-Circuit Current (PSCC).

To guarantee shock protection, the circuit protective device must disconnect within the times specified by BS 7671 (e.g., 0.4 seconds for TN systems on final circuits up to 64A). CableCalc calculates the total loop impedance ( Zscap Z sub s ) by summing the source impedance ( Zecap Z sub e ) and the conductor resistances (

CableCalc’s interface is typically characterized by a tiered data entry system.