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AC Voltage Calculator
Convert between peak, peak-to-peak, rms, and average AC voltage quantities.
ANSI Device Numbers
Quick search ANSI standard device numbers and their definition.
Battery Inspection
Electronic form for testing battery systems in accordance with NETA standards.
Battery Terms & Defnitions
Quick reference of over 250 battery terms and acronyms with dynamic search.
Bolt Torque Values
Look up the recommended torque value for various types and grades of U.S. standard fasteners.
Contact Resistance DB
Compare contact-resistance to real world values submitted by TestGuy members.
Digitrip GF Pickups
Find expected Ground Fault pickup values for most Cutler-Hammer/Westinghouse Digitrip RMS trip units.
Disconnect Switch Test
Electronic form for testing most types of disconnect and loadbreak switches in accordance with NETA standards.
Electrical Symbols
Browse common electrical diagram symbols or search dynamically by name.
Fall of Potential Test
Electronic test form for saving fall of potential test data.
General Inspection
Electronic test form for saving notes during general inspections.
Ground Resistance/Continuity Test
Electronic test form for saving point-to-point ground resistance test data.
Instrument Transformer Test
Electronic test form for saving instrument transformer test data.
Insulation Resistance Test
Electronic test form for saving insulation resistance test data.
Loss of Excitation
Calculate useful values for testing GE & SEL generator protection relays.
Low-Voltage Circuit Breaker Test
Electronic form for testing low-voltage power circuit breakers in accordance with NETA standards.
MV Cable Test Voltage
Get recommended voltage for DC and VLF cable testing.
MV Cable VLF/TD Test
Electronic form for VLF/TD testing medium-voltage cable in accordance with NETA standards.
MVA Calculator
Find MVA rating of a circuit breaker using nameplate ratings.
Maintenance Frequency
Get recommended service intervals for power distribution equipment and build maintenance plans.
Meter Settings Test
Electronic test form for saving multi-function metering tests.
Motor Calculations
Find FLA and torque for electric motors or convert between Horsepower and Watts.
My Progress
Review past exam scores and get stats on your progression.
Ohm's Law Calculator
Calculate the relationship between voltage, current, and resistance or the relationship between power, voltage, and current.
Percent Error Calculator
Calculate percent error with calibrated and actual results.
Polarization Index Test
Electronic test form for saving polarization index (PI) test data.
Power Factor Calulations
Calculate power factor for single- and three-phase circuits and find correction capacitor.
Power Triangle Calculator
Find PF, VAR, W and VA with any two known quantities or review power triangle formulas.
Switchgear Test
Electronic form for testing switchgear equipment in accordance with NETA standards.
TOC/IDMT Calculator
Calculate the protection trip time (TOC/IDMT) according to IEC 60255 and IEEE C37.112-1996 protection curves.
Tech Quiz
Distraction free testing environment.
Temperature Correction Factors
Correct insulation resistance (IR) test results to 20°C or 40°C and lookup recommended values.
Terms and Definitions
A complete library of terms related to electrical testing, with dynamic search.
Test Unit Converter
Convert between common test values such as Mega to Kilo and Base to Micro.
Thermography (IR) Tools
Get action levels, convert temperature, and more tools for infrared scanning.
Transformer Configurations
Get recommended test values, TTR tolerance and load currents for most ANSI transformers.
Trip Unit TCC Calculator
Generate test currents and generic trip times for LSIG trip units, includes tolerance for pickup and time values.
Two-Winding Transformer Test
Electronic form for testing dry-type and liquid-filled transformers with TTR, WR, and PI.
Vacuum Circuit Breaker Test
Electronic form for testing medium-voltage vacuum circuit breakers in accordance with NETA standards.
Voltage Drop Calculator
Estimate the voltage drop of an electric circuit based on the wire size, distance, and anticipated load current.
Wire Size Calculator
Calculate the appropriate low-voltage wire size based on NEC Article 310.15.

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