Size LV and MV cables and check installations: current rating with derating and voltage drop to IEC 60364-5-52, IEC 60287 MV cable ratings, NEC wire ampacity, conduit and cable tray fill, pulling tension, duct bank heating, and overhead line voltage regulation and losses.
IEC 60364-5-52 current-carrying capacity and voltage drop, with derating, short-circuit withstand, CPC sizing and lifecycle cost as advanced features.
IEC 60287 first-principles current rating for three single-core MV/HV cables in trefoil, buried direct or in ducts, with sheath losses and dielectric loss.
NEC Chapter 9 Tables 1, 4 and 5 conduit fill with the smallest compliant trade size, or the IET/BS 7671 space-factor method (about 40% conduit, 45% trunking).
NEC §392.22 width/area rules by tray type & cable category, or the common 40–50% international area-fill practice.
IEEE 1185 tension/capstan equations, sidewall bearing pressure & jam ratio.
HART/4-20mA capacitance-limited maximum cable length, minimum conductor size guidance, and general EMI separation-distance practice.
Voltage drop and regulation from your own conductor R/X per km, current, PF and length.
Annual I²R energy loss estimate from peak load, diversity and load factor, using the loss-factor approximation.
Full NEC Article 310 four-step derating chain — Table 310.16 base ampacity, ambient correction, bundling adjustment, and 110.14(C) termination cap. Auto-size or check a selected conductor.
10-ft, 25-ft and outside unlimited-length feeder tap compliance checks against length, ampacity ratio, protection and terminal OCPD conditions.
Simplified Neher-McGrath / IEC 60287 equal-area equivalent-cylinder external thermal resistance — bank-to-ambient temperature rise or maximum permissible losses.
Open-area (perforation) ratio of a cable tray from width, length and open area, with LOW-HIGH grading.
Why a cable has to pass two independent checks to be correctly sized, how MV cables are sized completely differently from LV ones, and why fill and pulling-tension limits matter just as much as the electrical sizing itself.