Cable Sizing & Ampacity Optimization Overview

Industrial Plant Power Design: 250 MW Steel Mill Substation Upgrade

A 250 MW integrated steel mill in Gary, Indiana, required a complete substation upgrade to support new electric arc furnace (EAF) loads and expanded rolling mill operations. The project involved replacing aging 138 kV GIS switchgear and upgrading the 138/13.8 kV main step-down transformer, necessitating full re-engineering of medium-voltage (13.8 kV) feeder cables from the substation to six critical process buildings.

Data Center Electrical Design: 40 MW Hyperscale Facility in Singapore

A 40 MW hyperscale data center located in Jurong East, Singapore, designed to support high-density AI and cloud workloads. The facility comprises eight server halls, each fed by dual 20 kV utility feeds, with redundant 10 kV medium-voltage switchgear and 400 V low-voltage distribution. Ambient temperature averages 31°C year-round, with high humidity (75–85% RH), impacting thermal derating.

_z = 1842 A 3 circuits / duct 400 V Bus Duct ΔU = 0.78% < 1% 50 kA S_min = 226 mm² Thermal Modeling ρ_t = 1.2 K·m/W T_amb = 40°C THD ≤ 8% IEC 60502-2 • CP 33:2021 • IEC 60331 • IEC 61034 20 kV Feeders Bus Duct / Cables Thermal Constraints SC Withstand

Hospital Power Systems: Seismic-Rated Emergency Distribution for LA County Medical Center

Retrofit and expansion of emergency power distribution infrastructure at Los Angeles County + USC Medical Center—a 600-bed Level I trauma center located in Seismic Zone IV. Project involved upgrading 4.16 kV and 480 V emergency switchgear, generator interconnections, and critical branch circuits serving ICU, ORs, ER, and life safety systems across three interconnected buildings.

_adj = 229 A VD = 1.87 V Riser (confined) Riser (confined) Gen Set SCCR ≥ 42.3 kA ATS Emergency Panel Demand Factor = 0.72 Derating Factors f_amb × f_grp × f_tray NEC Ampacity + OSHPD Seismic No Oversizing • Conduit Fill ≤ 40%

Solar Farm Design: 320 MWac Utility-Scale PV Plant in Texas Panhandle

320 MWac utility-scale photovoltaic solar farm located in the Texas Panhandle (near Amarillo), featuring bifacial monocrystalline modules mounted on single-axis trackers. Site experiences high ambient temperatures (up to 45°C), low humidity, and moderate wind exposure. Interconnection is via a 345 kV substation with 12 collector circuits feeding into 8 × 40 MVA pad-mounted transformers.

_adj = 498 A R_soil = 0.92 °C·m/W Optimization Challenge IEEE 835 / NEC 310 CYMCAP Thermal Modeling Soil: ρ=90 °C·cm/W L = 1.8 km Solar Farm Design: 320 MWac PV Plant Texas Panhandle • 35 kV Underground Collector Circuits

Substation Design: 500 kV GIS Switchyard Interconnection in Alberta Oil Sands

A 500 kV Gas-Insulated Switchgear (GIS) substation was designed to interconnect two major oil sands production facilities near Fort McMurray, Alberta. The project supported a 1,200 MW expansion of steam-assisted gravity drainage (SAGD) operations and required underground cable feeders to link the GIS yard with adjacent converter stations and generating units. The site featured permafrost-affected terrain, limited right-of-way, and extreme winter temperatures (−45°C), necessitating robust, compact, and thermally resilient cable solutions.