Sizing answers.
Code cited.
VoltForge helps engineers design industrial machine control panels with fast, traceable answers grounded in UL 508A and the National Electrical Code.
The toolkit
From panel inputs to a defensible next step.
Enter your panel and load specs, then get a clear recommendation with the rule behind it. No black boxes, no hunting through disconnected tables.
Motor & load sizing
Translate horsepower, voltage, and phase into defensible conductor, breaker, and motor starter recommendations.
Unit converter
Convert engineering units — length, area (incl. kcmil wire sizes), volume, weight, temperature, torque, pressure, and power — with the factor and math shown.
Enclosure heat
Size cooling and heating from panel dimensions, mounting, material, and device heat loss — with formulas shown.
Wire size from load amps
Enter a load current and get the smallest copper conductor gauge from the ampacity table, with the code citation behind it.
Amps ↔ kW
Convert between current and real power for single- and three-phase loads with power factor — formula and citation shown.
Main disconnect & breaker
Size the panel main switch and main breaker from up to 10 three-phase motor and non-motor loads.
Panel SCCR
Evaluate the panel's short-circuit current rating component-by-component per UL 508A Supplement SB and compare it with the available fault current.
Voltage drop
Size conductors so branch and feeder voltage drop stay within the 3% / 5% guidance, never below the Table 310.16 ampacity floor.
Grounding & bonding
Size equipment grounding conductors and grounding electrode conductors from the table and code rules.
Ampacity derating
Apply ambient temperature and conductor-bundling adjustment factors to the base ampacity tables.
Control transformer
Size control-power transformers and their overcurrent protection for the control circuit load.
Power factor correction
Calculate the capacitor kvar needed to bring a load to a target power factor.
Cable tray & wireway fill
Check fill and spacing limits for cable tray and wireway installations.
Busbar sizing
Size panel busbars from continuous load and short-circuit withstand requirements.
Panel label generator
Generate the field-marked nameplate and arc-flash warning label text for the panel.
Resistor color code
Enter the resistance value you want and read back the IEC 60062 color bands — 4- or 5-band — with per-color counts and the tolerance range.
Reference framework
Built around the standards you already use.
Free forever
Every calculator is free.
No paywall, no subscription, no account. If you’d like to support the project, an optional donation keeps the toolkit free — or a one-time unlock gives you unlimited lifetime report downloads.