PEC Conductor Size Calc FREE. Based on Philippine Electrical Code. CALCULATE: Standard Wire Size (upto 10 SETS of 3 - # 500 mm2 ). Standard Fuse and Breaker Size upto 6000 Amps. Conduit Sizes (PVC, RMC, LFMC, LFNC, IMC, FMC, ENT, EMT). Standard Service and Equipment Grounding Wire Size. Standard Wire Maximum Allowable Ampacity. Thermal and Overload Protection for Motor Loads.