Low-Voltage Circuit Breakers

James R. White Columns, Spring 2021 Columns, Tech Quiz

This edition of the Tech Quiz discusses one thing we all deal with, either at home or at work: low-voltage circuit breakers. Typically, they can last for years without causing problems, but they do require some maintenance and care. Continue on to find out what’s in store for you! When the topic of low-voltage circuit breakers comes up, what are …

Portable and Mobile Ladder Safety

Paul Chamberlain Columns, Safety Corner, Spring 2021 Columns

Falls from ladders account for 20% of all fatalities and lost-workday injuries in general industry according to Occupational Safety and Health Administration (OSHA) statistics. Ensuring that all ladders meet OSHA and American National Standards Institute (ANSI) standards is critical in mitigating this statistic. OSHA Regulatory Requirements OSHA published an update to its walking-working surface rule (Subpart D) for general industry …

Animal Damage in the Field

Don A. Genutis Columns, In the Field, Spring 2021 Columns

Emergencies always seem to occur on Fridays and weekends, and true to form, a panicked customer called about a power outage to a significant portion of a college campus on a Friday morning. It seemed likely to be a 4,160 volt cable or unit substation problem, so we pulled two technicians away from an acceptance testing project and got them on …

Measuring Field Winding Insulation Resistance

Steve Turner Columns, Relay Column, Spring 2021 Columns

Multi-function numerical generator protection relays can calculate the insulation resistance of a synchronous generator field winding to ground. The calculation can be performed on an energized or de-energized generator. The particular relay discussed in this article uses a separate module located close to the rotor slip rings and brushes to monitor the field. The close proximity of the module to …

Looking at NFPA 70E 2021: Part 2

Ron Widup and James (Jim) R. White Columns, NFPA 70E and NETA, Spring 2021 Columns

This issue of NETA World continues with the deep dive into the NFPA 70E revisions that went into the 2021 edition. Part 1 in the Winter 2020 issue covered the reorganization (which was not nearly as extensive as in previous editions); reviewed Article 100 Definitions; and began on Article 110 General Requirements for Electrical Safety-Related Work Practices with Section 110.1 …

PowerTest 2021—An All-New Virtual Experience

Scott A. Blizard President's Desk, Columns, Spring 2021 Columns

It is January 20, 2021, and the country is in the midst of a resurgence of the COVID-19 virus. The Conference Committee, in consultation with the NETA Board of Directors, has decided  to go totally virtual with PowerTest 2021,  the premier electrical maintenance and safety conference intended for all electrical professionals and especially beneficial for field service technicians, inspectors, utility …

Primary Injection Testing on Low-Voltage Circuit Breakers

Sanket Bolar Features, Spring 2021 Features

Circuit breakers used in low-voltage applications include air circuit breakers, insulated-case and molded-case circuit breakers, and miniature circuit breakers. Air circuit breakers or low-voltage power circuit breakers typically function as the incoming device on a low-voltage switchboard. In the event of an overload condition or short circuit, current sensors in low-voltage power circuit breakers measure high currents and send the …

Low-Voltage Air Circuit Breakers—A Maintenance Must!

Kerry Heid Features, Spring 2021 Features

Low-voltage circuit breakers are predominant in virtually every electrical power system. A 2008 NETA survey and associated IEEE paper showed that 22% of these breakers did not follow their time-current characteristics, and 10.5% did not operate at all when service-aged maintenance was undertaken. The majority of failures were mechanical in nature; this indicates regular maintenance must be a priority. Low-voltage …

Working with Circuit Breakers Safely

James R. White Cover Story, Spring 2021 Cover Story

Circuit breakers come in several types of operating styles differentiated by what they use to safely extinguish an arc in a circuit, including air, air-magnetic, vacuum, and SF6. While most older circuit breakers were manufactured in the United States, mostly by companies such as Westinghouse Electric, General Electric, and Federal Pacific, today many circuit breakers are imported. Older companies merged …

NETA Welcomes QP Testing as New NAC

NETA World Staff NETA News, Spring 2021 NETA News

QP Testing is located in the Chicagoland area and provides electrical testing and field services to the utility, industrial, and commercial markets. Our NETA Accredited Technicians and Engineers are experts in testing, analysis, and maintenance of our customers’ electrical power systems, including primary and secondary injection testing of circuit breakers, transformer testing, relay calibration, cable testing, preventive maintenance, and outage …