Sheet E-001
Engineering Tools
Free calculators and viewers our engineers use on real projects. Each one runs in your browser, shows every step, and sends nothing to us. Bookmark the ones you use.
Bus ACables and raceways
MV Cable Ampacity CalculatorMedium-voltage cables to 35 kV, buried or in air. Steady-state and emergency ratings with a heat map of the duct bank.IEC 60287, Neher-McGrathLV Cable Ampacity CalculatorCables from 600 V to 2 kV in duct banks, direct buried, in conduit in air or in free air, from the NEC tables or by Neher-McGrath.NEC 2023, Neher-McGrathCable Pulling CalculatorPulling tension and sidewall bearing pressure along a conduit route, in both directions, for cable to 35 kV.IEEE 1185, Southwire guideConduit Fill CalculatorFill for building wire, medium-voltage cable to 35 kV, Ethernet and fiber, with jam ratio and clearance checks.NEC Chapter 9
Bus BShort circuit and arc flash
Fault Current CalculatorSingle- and three-phase bolted fault current from the utility source to the end of the cable.Ohmic methodShort Circuit and Arc FlashDraw a low-voltage one-line to 480 V ac or 1500 V dc, then get fault currents, device coordination and arc flash labels.IEEE 1584, NFPA 70E
Bus CBuilding circuits and equipment
Circuit CalculatorBranch circuits and feeders of 1000 V and less: protection, conductors, grounding, raceways and voltage drop.NEC 2023Transformer CalculatorProtection, conductors, grounding and raceways for transformers of 1000 V and less.NEC 2023Motor CalculatorBranch circuits for motors of 1000 V and less: protection, conductors, grounding, raceway and control.NEC 2023Panel Schedule CalculatorPanelboard and switchboard schedules, branch-circuit sizing and load calculations.NEC 2023
Bus DOverhead distribution
Bus EPower system models
SKM ViewerOpen an SKM PowerTools project in your browser: the one-line diagram, load flow and short circuit. Nothing is uploaded.SKM PowerTools projectsETAP ViewerOpen an ETAP project in your browser: the one-line, load flow, short circuit and arc flash, with clearing times from SEL relays. Nothing is uploaded.ETAP projects, IEEE 1584PSLF ViewerOpen GE PSLF EPC, DYD and DRW files: one-line, power flow, short circuit, dynamics and WECC data checks. Nothing is uploaded.GE PSLF, WECC checks