Interactive labs, calculators & simulators
49 browser-based tools across 11 disciplines. No account needed to open a lab. Availability and validation are shown separately on every card.
Filters
Tool results
Arc Flash Concept Simulator
Explain how incident energy is influenced by available fault current, clearing time, working distance, and equipment configuration.
- NFPA 70E
- IEEE 1584
- ARC FLASH
Box Fill Calculator
Apply the five NEC 314.16(B) counting categories — conductors, clamps, support fittings, device yokes, and equipment grounding conductors — and sta…
- NEC
- BOX FILL
- NEC 314.16
Breaker Trip Unit Simulator
Identify the four LSIG regions on a time-current characteristic curve and explain the protection purpose of each.
- IEEE
- LSIG
- TRIP UNIT
Busway / Bus Duct Insulation & Connection Test Report
Document a complete busway insulation resistance and connection resistance test record from project header through dual-signature review.
- NETA ATS
- NETA MTS
- BUS DUCT
Commercial Load Build-Up Calculator
Apply the correct NEC Article 220 demand factor for each commercial load category — general lighting (220.42), non-dwelling receptacles (220.14(H))…
- NEC
- COMMERCIAL LOAD
- SERVICE LOAD
Conductor Ampacity & Wire Sizing Calculator
Look up conductor ampacity from NEC Table 310.16 on the 90°C column, then cap the result at the terminal temperature rating under 110.14(C).
- NEC
- AMPACITY
- CONDUCTOR SIZING
Conductor Derating & Adjustment Explorer
Apply temperature correction factor from NEC 310.15(B)(2) for the actual ambient temperature and explain why a higher ambient reduces allowable amp…
- NEC
- CONDUCTOR DERATING
- ADJUSTMENT FACTOR
Conduit Fill Calculator
Apply the NEC Chapter 9, Table 1 fill percentage limits — 53% for one conductor, 31% for two, 40% for three or more — to a raceway fill calculation.
- NEC
- CONDUIT FILL
- NEC CHAPTER 9
Continuous Load Sizing Basis Calculator
State the NEC definition of a continuous load (maximum current for 3 hours or more) and explain why the classification triggers the 125% sizing mul…
- NEC
- CONTINUOUS LOAD
- NONCONTINUOUS LOAD
CT / PT and Relay Measurement Simulator
Explain how CT ratio and burden affect secondary current accuracy and relay input.
- IEEE
- NETA ATS
- NETA MTS
Differential Protection Simulator
Explain the operate-vs-restraint characteristic and why a percentage slope is used instead of a fixed pickup.
- IEEE
- NETA ATS
- 87T
Dwelling Unit Load Calculator
Apply the NEC Standard Method under Article 220 Part III to a single-family dwelling, calculating general lighting load, small appliance branch cir…
- NEC
- DWELLING UNIT
- RESIDENTIAL LOAD
Equipment Grounding Conductor (EGC) Sizing Calculator
Look up the minimum EGC size from NEC Table 250.122 given a known OCPD rating and explain why EGC sizing is based on OCPD rather than load current.
- NEC
- EGC
- NEC 250.122
EV Charger Branch, Feeder & Service Calculator
Apply the NEC Article 625 continuous-load factor to EVSE branch circuit sizing.
- NEC
- EV CHARGER
- EVSE
Fault Current & Short-Circuit Simulator
Convert system impedances to a common per-unit base and compute total impedance from source to fault location.
- IEEE
- IEC 60909
- SHORT CIRCUIT
General Lighting & Receptacle Branch-Circuit Calculator
Look up the general lighting VA/ft² value from NEC Table 220.12 for a given occupancy type and calculate the total general lighting load for a defi…
- NEC
- GENERAL LIGHTING
- RECEPTACLE
Generator Test Documentation
Document complete generator and engine nameplate data including manufacturer, ratings, fuel type, and ignition classification for both the alternat…
- NETA ATS
- NETA MTS
- GENERATOR
Generator, ATS & Emergency Power Sequence Simulator
List the sequence of states from utility loss to stable generator supply and identify timing requirements for each.
- GENERATOR
- ATS
- EMERGENCY POWER
Grounding & Bonding System Visualizer
Distinguish between grounding (earth connection) and bonding (equipotential connection) as defined by NEC Article 250.
- NEC
- GROUNDING
- BONDING
Grounding Electrode Conductor (GEC) Sizing Calculator
Look up the GEC size from NEC Table 250.66 given the largest service-entrance or feeder conductor size and explain why the GEC is sized from the so…
- NEC
- GEC
- NEC 250.66
Harmonics & Waveform Distortion Lab
Explain Fourier decomposition and how any periodic waveform can be expressed as a sum of harmonic components.
- IEEE
- HARMONICS
- THD
HVAC & Refrigeration MCA / MOCP Interpreter
Explain the difference between Article 440 (nameplate-driven) and Article 430 (calculation-driven) sizing and identify which applies to hermetic re…
- NEC
- HVAC
- MCA
Industrial Sensor & Signal Simulator
Trace a process variable through a sensor, signal conditioner, and 4–20 mA loop to a PLC analog input.
- 4-20MA
- 0-10V
- INDUSTRIAL SENSOR
LV Circuit Breaker Test Report
Document complete LV circuit breaker nameplate data — including category, frame size, sensor and rating plug values, trip functions present, and as…
- NETA ATS
- NETA MTS
- CIRCUIT BREAKER
MCC Inspection & Test Documentation
Complete the 12-item MCC visual and mechanical inspection checklist — from overall cleanliness through wiring and terminations — recording Inspecte…
- NETA ATS
- NETA MTS
- MCC
Motor Branch-Circuit Conductor & OCPD Study Tool
Look up full-load current from NEC Tables 430.248 and 430.250 for single-phase, three-phase, and synchronous motors, and explain why nameplate amps…
- NEC
- MOTOR BRANCH CIRCUIT
- NEC ARTICLE 430
Motor IR / DAR / Polarization Index Test Record
Identify the correct IEEE 43-2013 winding category and minimum IR acceptance value for form-wound and random-wound motor windings and explain why t…
- NETA ATS
- NETA MTS
- IEEE
Motor Starting Simulator
Compare inrush current magnitude and duration for DOL, reduced voltage, soft starter, and VFD starting methods.
- IEEE
- MOTOR STARTING
- DOL
Multiple Motor Feeder & Service Calculator
Apply NEC 430.24 to size a feeder conductor for multiple motors — 125% of the largest motor FLC plus 100% of every other motor FLC plus any non-mot…
- NEC
- MOTOR FEEDER
- NEC 430.24
MV Air Circuit Breaker Test
Document complete MV air circuit breaker nameplate data including maximum voltage (kV), interrupting capacity (kA), ampacity, operating voltage, an…
- NETA ATS
- NETA MTS
- MV CIRCUIT BREAKER
OCPD Sizing Calculator
Apply the NEC 240.4(B) next-standard-size-up rule and identify when it is permitted versus when 240.4(D) imposes a hard cap based on conductor size.
- NEC
- OCPD
- OVERCURRENT PROTECTION
One-Line Diagram Builder & Explorer
Place and connect standard one-line diagram symbols for sources, transformers, breakers, buses, and loads.
- ONE-LINE DIAGRAM
- SINGLE-LINE DIAGRAM
- SLD
Panelboard & Feeder Load Calculation
Identify which NEC Article 220 demand factor applies to each load category — general lighting (220.42), non-dwelling receptacles (220.14(H)), offic…
- NEC
- PANELBOARD LOAD
- FEEDER LOAD
PLC Ladder Logic Simulator
Describe the PLC scan cycle — input scan, program execution, output update — and explain why scan order matters.
- PLC
- LADDER LOGIC
- SCAN CYCLE
Power Factor Correction Simulator
Draw and label the power triangle with real (kW), reactive (kVAR), and apparent (kVA) power components.
- IEEE
- POWER FACTOR
- KVAR
Power Panel Insulation Resistance Test Record
Complete the pre-test safety checklist — confirming de-energization/LOTO, manufacturer test method review, and disconnection of loads, electronics,…
- NETA ATS
- NETA MTS
- INSULATION RESISTANCE
Power System Simulator
Calculate line-to-neutral and line-to-line voltages for both Wye and Delta connections given source voltage.
- THREE-PHASE POWER
- SINGLE-PHASE
- PHASOR DIAGRAM
Power Transformer Simulator
Explain the two components of transformer losses — core (no-load) losses and copper (load) losses — and identify at what load level efficiency is m…
- IEEE
- NETA ATS
- TRANSFORMER
Protection Zone & Relay Scheme Explorer
Draw and describe the protection zone boundaries for feeder, transformer, and bus protection in a simple substation.
- IEEE
- PROTECTION RELAY
- PROTECTION ZONE
Protective Relay Coordination / TCC Visualizer
Read a time-current characteristic curve and identify the pickup, time-delay, and instantaneous regions for both upstream and downstream devices.
- IEEE
- TCC
- TIME-CURRENT CURVE
Protective Relay Test Record
Complete a NETA-aligned protective relay test record from job header through dual-signature review, following the logical sequence of a relay accep…
- NETA ATS
- NETA MTS
- PROTECTIVE RELAY
SCCR / AIC Fault Current Compliance Checker
Distinguish AIC (device interrupting capacity) from SCCR (assembly withstand rating) and explain why both must be checked.
- NEC
- SCCR
- AIC
Service & Feeder Conductor Sizing Calculator
Apply the NEC continuous-load multiplier (125%) to calculate minimum conductor ampacity for feeders and services under Articles 215 and 230.
- NEC
- SERVICE ENTRANCE
- FEEDER CONDUCTOR
Substation & Switchgear Bus Configuration Explorer
Describe the key differences between single bus, double-ended, sectionalized bus, and alternate source configurations in terms of redundancy and sw…
- IEEE
- SUBSTATION
- BUS CONFIGURATION
Switchgear Inspection & Test Record
Complete all 19 visual and mechanical inspection checklist sections in the NETA-aligned sequence — from nameplate verification through as-left conf…
- NETA ATS
- NETA MTS
- SWITCHGEAR
Symmetrical Components & Fault Visualizer
Explain why any unbalanced phasor set can be decomposed into three balanced sequence sets.
- IEEE
- IEC 60909
- SYMMETRICAL COMPONENTS
Transformer Vector Group & Polarity Visualizer
Interpret an IEC vector group designation (e.g., Dyn11, YNd1) and identify the winding connection and phase shift it encodes.
- IEEE
- DYN11
- YND1
Transformer Winding Resistance Test Report
Configure the winding resistance test matrix for any transformer vector group (Dyn, Ynd, Dd, Yyn) using the wizard or presets, specifying the corre…
- NETA ATS
- NETA MTS
- IEEE
Voltage Drop Calculator & Explorer
Calculate AC voltage drop percentage using conductor resistance and reactance from NEC Chapter 9 tables, applying power factor and temperature corr…
- NEC
- IEEE
- VOLTAGE DROP