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- ANSI Rule of Thumb for Transformer Polarity
  
  NETA Level 3 Exam 7
  
  Facing the High Voltage side of a three phase transformer, where is H1? Your Answer: In the center Correct Answer: Over the right shoulder Help: Transformer...
  
  Last post by viking12 3 Days Ago
- IEEE 1584 circuits less than 240V
  
  NETA Level 4 Exam 4
  
  According to IEEE 1584, Circuits less than 240V supplied from transformers less than 125kVA may be omitted from an Arc Flash Hazard Analysis and will be...
  
  Last post by anonymous 4 Days Ago
- XFMR test question - wye-delta TTR
  
  NETA Level 2 Exam 17
  
  A wye-delta transformer has a primary line voltage of 7200 V and a secondary line voltage of 480 V. What is the turns ratio? Your Answer: 15:1 Not sure...
  
  Last post by jts1976 1 Week Ago
- Delta vs wye advantages and disadvantages
  
  Electrical Testing Talk 1
  
  Hello everyone, I’ve been trying to understand what advantages and disadvantages delta/delta vs delta/wye vs wye/wye transformers have in a power system....
  
  Last post by Kalbi_Rob 1 Week Ago
- Dry Type Transformer Winding Failure After Energizing
  
  Electrical Testing Talk 6
  
  We had a tech go out last week to test three 125Kva dry type transformers. He did an insulation resistance test and a TTR test on the used tap setting for...
  
  Last post by Kalbi_Rob 1 Week Ago
More topics: Electrical Testing Talk | Relay Testing Talk | Safety & Arc-Flash | NETA Exam Prep | NICET Certification Talk
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Technical Articles
- Inverse Time Overcurrent Relays and Curves Explained
  
  Overcurrent relaying is one of the most simple and economical types of protection used for power system feeders, transformers, generators and motors. Since the advent of simple electromechanical... Continue Reading
  
  Posted By testguy July 28, 2021
- Power Factor Testing: Voltage Considerations Explained
  
  The first step in any comprehensive testing approach is to create a plan that ensures the safety of both the equipment under test and personnel performing the test. Keeping the device under test safe... Continue Reading
  
  Posted By testguy January 4, 2021
- Motor Nameplate and Ratings Explained
  
  We explain the markings found in NEC along with other common terms and ratings included on motor nameplates. Continue Reading
  
  Posted By testguy August 30, 2020
- Electrical Drawings and Schematics Overview
  
  Designing, installing, and troubleshooting of electrical systems requires the use of various drawings to give engineers, installers, and technicians a visual representation of the systems they work... Continue Reading
  
  Posted By testguy July 19, 2020
- Insulating Liquids: Basic Properties, Types and Applications Explained
  
  Fluid inside electrical apparatus is the lifeblood that serves both as a dielectric and a cooling medium. Continue Reading
  
  Posted By testguy June 25, 2020
- 4 Critical Tests for Evaluating HV Circuit Breaker Performance
  
  Regardless of the breaker type, its important to test their components regularly to help ensure proper operation in case of a system fault or switching operation. Continue Reading
  
  Posted By testguy March 9, 2020
- Power Quality Analysis: Basic Theory and Applications Explained
  
  There is no such thing as perfect power quality in the real world. Service interruptions, equipment malfunction, and excess power consumption are all common symptoms of poor power quality. Continue Reading
  
  Posted By testguy November 23, 2019
- Magnetron Atmospheric Condition (MAC) Testing Principles
  
  Unlike the hipot test, testing vacuum interrupters utilizing magnetron atmospheric condition (MAC) principles can provide a viable means for determining the condition of vacuum interrupters prior to... Continue Reading
  
  Posted By testguy September 15, 2019
- Electrical Power System Studies Explained
  
  There are many different types of power system study, each with their own special purpose and calculation method. Each analysis is unique to a particular power system, any changes within the system... Continue Reading
  
  Posted By testguy August 9, 2019
- Power Distribution Unit (PDU) Applications, Testing & Maintenance
  
  Traditional data center power distribution designs consist of multiple PDUs delivering power to remote power panels (RPPs) throughout the building, which in turn deliver power to network hardware... Continue Reading
  
  Posted By testguy May 26, 2019
- Network Protector Basics: Applications, Operation, and Testing
  
  This guide covers network protector basic operation and maintenance procedures. Continue Reading
  
  Posted By testguy April 19, 2019
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Popular on TestGuy
- Remembered NETA 2 Questions Help
  
  NETA Level 2 Exam 23
  
  To Whom it May Help: Here are some questions from my NETA 2 test that I remembered but did not know. All help is greatly appreciated! I did not...
  
  Last post by Kalbi_Rob 3 Weeks Ago
- VLF Dead break terminations
  
  Electrical Testing Talk 13
  
  We are out on a solar farm testing 35kv cable with Dead break terminations. The termination is 21.1kv rated but 35kv class. Cable is 35kv xlpe cable. Neta...
  
  Last post by tcoupekyle 2 Weeks Ago
- Transformer Winding Resistance
  
  Electrical Testing Talk 12
  
  Hi everyone, I hope you all doing okay. I wonder something and you are the best crew i can ask :) When we test winding resistance test for transformer we...
  
  Last post by SecondGen March 29, 2021
- Applying a solidly grounded wire after hipot test
  
  NETA Level 2 Exam 12
  
  Applying a solidly grounded wire immediately after performing a high-potential test:
  
  Last post by SecondGen July 18, 2021
- Doble M4000 Temp Sensor Help
  
  Electrical Testing Talk 9
  
  Looking to repair our M4000 temp/humidity sensor cable, can anyone help with the pinouts? Connector pins are labeled 1-4, need to know which color goes to...
  
  Last post by SecondGen January 26, 2021
- ANSI Rule of Thumb for Transformer Polarity
  
  NETA Level 3 Exam 7
  
  Facing the High Voltage side of a three phase transformer, where is H1? Your Answer: In the center Correct Answer: Over the right shoulder Help: Transformer...
  
  Last post by viking12 3 Days Ago
- Electronic Molded Case CB Test Data ?
  
  Electrical Testing Talk 7
  
  I received a test report for an molded case CB with electronic trip unit, in the comments it reads "Megger Load Side Only. Contact Resistance Does Not Meet...
  
  Last post by Kalbi_Rob April 13, 2021
- Disconnect Fuse Switch Testing
  
  Electrical Testing Talk 7
  
  I used a FLuke 43B power analyzer to read the line and load from a fuse disconnect switch. The results were mind boggling because the load was 7.4 amps and the...
  
  Last post by anonymous August 10, 2021
More topics: Electrical Testing Talk | Relay Testing Talk | Safety & Arc-Flash | NETA Exam Prep | NICET Certification Talk
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Facing the High Voltage side of a three phase transformer, where is H1? Your Answer: In the center Correct Answer: Over the right shoulder Help: Transformer...

According to IEEE 1584, Circuits less than 240V supplied from transformers less than 125kVA may be omitted from an Arc Flash Hazard Analysis and will be...

A wye-delta transformer has a primary line voltage of 7200 V and a secondary line voltage of 480 V. What is the turns ratio? Your Answer: 15:1 Not sure...

Hello everyone, I’ve been trying to understand what advantages and disadvantages delta/delta vs delta/wye vs wye/wye transformers have in a power system....

We had a tech go out last week to test three 125Kva dry type transformers. He did an insulation resistance test and a TTR test on the used tap setting for...

To Whom it May Help: Here are some questions from my NETA 2 test that I remembered but did not know. All help is greatly appreciated! I did not...

We are out on a solar farm testing 35kv cable with Dead break terminations. The termination is 21.1kv rated but 35kv class. Cable is 35kv xlpe cable. Neta...

Hi everyone, I hope you all doing okay. I wonder something and you are the best crew i can ask :) When we test winding resistance test for transformer we...

Applying a solidly grounded wire immediately after performing a high-potential test:

Looking to repair our M4000 temp/humidity sensor cable, can anyone help with the pinouts? Connector pins are labeled 1-4, need to know which color goes to...

Facing the High Voltage side of a three phase transformer, where is H1? Your Answer: In the center Correct Answer: Over the right shoulder Help: Transformer...

I received a test report for an molded case CB with electronic trip unit, in the comments it reads "Megger Load Side Only. Contact Resistance Does Not Meet...

I used a FLuke 43B power analyzer to read the line and load from a fuse disconnect switch. The results were mind boggling because the load was 7.4 amps and the...

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