Test & Measurement

The latest in electrical test equipment development, installation, and application

Highlights

Working Safely With Circuit Breakers

Jan. 12, 2023
Understanding the risks is essential for electrical workers.
Electric grid
Electric grid
Electric grid
Electric grid
Electric grid

Supraharmonics in Distributed Generation Power Systems

Sept. 8, 2023
Will these high-frequency harmonics be the new threat?
Photo 2. The NEC Sec. 110.7, Wiring Integrity, requires “completed wiring installations shall be free from short circuits, ground faults, or any connections to ground other than as required or permitted elsewhere in this Code.” Before installation of load side conductors into this 200A disconnect, the line side conductors are tested to ensure no ground faults exist. Load side conductors will be tested after installation.
Photo 2. The NEC Sec. 110.7, Wiring Integrity, requires “completed wiring installations shall be free from short circuits, ground faults, or any connections to ground other than as required or permitted elsewhere in this Code.” Before installation of load side conductors into this 200A disconnect, the line side conductors are tested to ensure no ground faults exist. Load side conductors will be tested after installation.
Photo 2. The NEC Sec. 110.7, Wiring Integrity, requires “completed wiring installations shall be free from short circuits, ground faults, or any connections to ground other than as required or permitted elsewhere in this Code.” Before installation of load side conductors into this 200A disconnect, the line side conductors are tested to ensure no ground faults exist. Load side conductors will be tested after installation.
Photo 2. The NEC Sec. 110.7, Wiring Integrity, requires “completed wiring installations shall be free from short circuits, ground faults, or any connections to ground other than as required or permitted elsewhere in this Code.” Before installation of load side conductors into this 200A disconnect, the line side conductors are tested to ensure no ground faults exist. Load side conductors will be tested after installation.
Photo 2. The NEC Sec. 110.7, Wiring Integrity, requires “completed wiring installations shall be free from short circuits, ground faults, or any connections to ground other than as required or permitted elsewhere in this Code.” Before installation of load side conductors into this 200A disconnect, the line side conductors are tested to ensure no ground faults exist. Load side conductors will be tested after installation.

Measuring Insulation Resistance the Right Way

Aug. 11, 2023
How this maintenance practice can reduce costs/downtime and create an electrically safe work condition
Circuit Breaker Sales, LLC
Photo 1. An arc flash can generate an electric arc with a temperature of 35,000ºF.
Photo 1. An arc flash can generate an electric arc with a temperature of 35,000ºF.
Photo 1. An arc flash can generate an electric arc with a temperature of 35,000ºF.
Photo 1. An arc flash can generate an electric arc with a temperature of 35,000ºF.
Photo 1. An arc flash can generate an electric arc with a temperature of 35,000ºF.

Assessing Circuit Breaker Condition and Arc Flash Safety

Aug. 11, 2023
Best practices for identifying and reducing arc flash incident risk in the field
Photo 1. Wearing the correct PPE ensures the safety of testing personnel.
Photo 1. Wearing the correct PPE ensures the safety of testing personnel.
Photo 1. Wearing the correct PPE ensures the safety of testing personnel.
Photo 1. Wearing the correct PPE ensures the safety of testing personnel.
Photo 1. Wearing the correct PPE ensures the safety of testing personnel.

A Quick Guide to Discharge Testing

July 13, 2023
Capacity testing is an effective way to measure battery health.
© Denniro | Dreamstime.com
Video camera
Video camera
Video camera
Video camera
Video camera
© Marcos Calvo Mesa | Dreamstime.com
Frustrated electrical worker
Frustrated electrical worker
Frustrated electrical worker
Frustrated electrical worker
Frustrated electrical worker
Courtesy of Shermco Industries.
Qualified electrical workers must understand the hazards presented by exposed energized parts and know how to protect themselves using safe electrical work practices.
Qualified electrical workers must understand the hazards presented by exposed energized parts and know how to protect themselves using safe electrical work practices.
Qualified electrical workers must understand the hazards presented by exposed energized parts and know how to protect themselves using safe electrical work practices.
Qualified electrical workers must understand the hazards presented by exposed energized parts and know how to protect themselves using safe electrical work practices.
Qualified electrical workers must understand the hazards presented by exposed energized parts and know how to protect themselves using safe electrical work practices.

What Makes a Qualified Electrical Worker

May 10, 2023
Who is qualified and who isn’t when it comes to electrical safety — and what training is required?
time domain reflectometer
time domain reflectometer
time domain reflectometer
time domain reflectometer
time domain reflectometer

How to Measure Hidden Electrical Cables

May 1, 2023
Case study demonstrates why this task doesn’t need to be tedious
Ron Widup Ecm Asks
Ron Widup Ecm Asks
Ron Widup Ecm Asks
Ron Widup Ecm Asks
Ron Widup Ecm Asks

EC&M Asks Video — How to Avoid a Bus Duct Failure

April 26, 2023
In Episode 14, Ron Widup covers a variety of bus duct basics.
Fig. 1. Harmonics is demonstrated by the shape of a voltage or current waveform relative to its fundamental frequency.
Fig. 1. Harmonics is demonstrated by the shape of a voltage or current waveform relative to its fundamental frequency.
Fig. 1. Harmonics is demonstrated by the shape of a voltage or current waveform relative to its fundamental frequency.
Fig. 1. Harmonics is demonstrated by the shape of a voltage or current waveform relative to its fundamental frequency.
Fig. 1. Harmonics is demonstrated by the shape of a voltage or current waveform relative to its fundamental frequency.

Harmonics: The Dreaded “H Word”

April 7, 2023
What exactly is harmonics, and why should you care?