Power System Calculators

Calculate Voltage (V), Current (I), Resistance (R), and Power (P) in Watts, VA, and VARs - the foundation of all electrical work.

Calculate incident energy and arc flash boundary according to IEEE 1584-2018 standards.

Estimate short circuit current levels at various points in your electrical distribution system.

Calculate voltage drop and minimum wire size based on conductor length, load current, and NEC requirements to ensure voltage at circuit end is within acceptable limits.

Calculate maximum number of conductors allowed in conduits per NEC tables, ensuring code compliance and safe installation practices.

Determine the maximum current a conductor can safely carry based on installation method, ambient temperature, and NEC derating factors.

Calculate motor running current based on horsepower, voltage, and phase. Includes wire and breaker sizing for motor circuits.

Determine correct overcurrent protection device size for given loads, ensuring proper circuit protection per NEC requirements.

Analyze and visualize time-current curves for protective device coordination studies.

Determine appropriate transformer sizes based on load requirements and future expansion needs.

Calculate ground grid parameters and touch/step potentials for substation and industrial applications.

Analyze the impact of starting large motors on the electrical system. Calculate voltage dip and starting time, helping select appropriate motor starters and ensure voltage drop remains within acceptable limits.

Improve electrical efficiency and reduce electricity costs. Determine the required size of capacitor banks to correct poor power factor, analyzing reactive power and recommending appropriate kVAR ratings.

Determine appropriate cable size based on current carrying capacity, short circuit temperature rise, and NEC standards. Includes tools for cable pulling tension and conduit fill calculations.

Size photovoltaic arrays, wind turbines, and battery storage systems. Analyze factors like solar irradiance, wind speed data, and energy consumption patterns for optimal renewable energy design.

Size branch and feeder circuits for residential and commercial applications. Calculate protection size, conductor specifications, grounding requirements, raceway dimensions, and maximum circuit parameters for single and three-phase loads.

Design electrical circuits specifically for HVAC systems. Determine optimal protection devices, conductor sizing, equipment grounding specifications, and raceway requirements for residential and commercial air conditioning installations.

Calculate branch circuit requirements for electric heating systems. Specify protection ratings, conductor dimensions, grounding conductor sizing, and raceway specifications for single and three-phase heating equipment.

Design branch circuits for motor loads in residential and commercial applications. Determine protection requirements, conductor specifications, equipment grounding needs, and maximum circuit parameters for various motor configurations.

Calculate complete electrical service requirements for dwelling units. Determine main protection ratings, service conductor sizing, grounding specifications, and raceway dimensions based on total residential loads.

Size primary and secondary conductors with protection devices for transformer installations. Calculate conductor specifications, protection ratings, and grounding requirements for single and three-phase transformer applications.

Comprehensive protection system analysis and coordination. Calculate relay settings, trip times, and coordination curves to ensure proper selective protection throughout the electrical distribution system.

Calculate full load current, starting current, and running current for various motor types. Determine current requirements for single and three-phase motors based on horsepower, voltage, and efficiency ratings.

Determine synchronous speed, slip, and actual motor speed. Calculate RPM based on frequency, pole count, and load conditions for AC induction motors.

Calculate starting torque, full load torque, and breakdown torque for electric motors. Analyze torque-speed characteristics and determine optimal motor selection for specific applications.

Calculate primary and secondary currents for transformers. Determine full load current, inrush current, and circulating currents for various transformer configurations and connection types.

Analyze fault current contributions through transformers. Calculate available fault current on secondary side based on primary system fault levels and transformer impedance.

Determine generator current output based on load requirements. Calculate current ratings for various power factors and load conditions in standby and prime power applications.

Calculate fault current contribution from generators. Analyze subtransient, transient, and steady-state fault currents based on generator reactances and system configuration.

Size battery systems for backup power applications. Calculate amp-hour requirements, number of cells, and battery string configuration based on load profile and autonomy requirements.

Calculate full load current for various electrical equipment. Determine current ratings for motors, transformers, and other loads based on power ratings and system voltage.

Calculate three-phase power, current, and voltage relationships. Convert between kW, kVA, kVAR, and power factor for balanced three-phase systems.

Quick access to relevant NEC 2023 articles and tables for each calculation, ensuring code compliance and saving time on lookups.

Visual conduit bending tool for offsets, saddles, and 90° bends with step-by-step measurements and take-up calculations.

Convert between electrical units including AWG to mm², power units, temperature, and length measurements commonly used in electrical work.

Calculate required transformer kVA for given loads and determine primary/secondary currents for proper sizing and protection.

Estimate operating costs of electrical equipment based on power consumption, usage hours, and utility rates.

Calculate motor efficiency and power factor to optimize performance and reduce energy costs.