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Limitations of Arc Flash Hazard Tables

Limitations of Arc Flash Hazard Tables

It's important to understand the Hazard/Risk Category levels listed in NFPA 70E, but just as important to understand the limitations of these tables.

Assessing Low-Voltage Arc Hazards

Assessing Low-Voltage Arc Hazards

This article explains how arc flash software is essential to identifying and analyzing high-risk arc flash areas, so you can help keep your electrical staff safer.

Evaluating NFPA 70E Arc Flash Hazard Category Tables

Evaluating NFPA 70E Arc Flash Hazard Category Tables

This article sheds some light onto the assumptions and generalizations utilized by the NFPA 70E Table 130.7(C)(9)(a) and to describe its limitations and shortcomings which may lead to an improper selection of Personal Protective Equipment (PPE).

Evaluating the Hazards of Low-Voltage Arcs

Evaluating the Hazards of Low-Voltage Arcs

Methods available for calculating the incident energy released by an arc fault in low-voltage equipment and considerations to determine the worst-possible hazard associated with energized work at different locations of the equipment.

Impact of Harmonics on Performance of Over-Current Relays

Impact of Harmonics on Performance of Over-Current Relays

This Paper investigates the impact of power system harmonics on the performance of over-current relays.

Using Genetic Algorithm for Distributed Generation Allocation to Reduce Losses and Improve Voltage Profile

Using Genetic Algorithm for Distributed Generation Allocation to Reduce Losses and Improve Voltage Profile

This paper presents a method for the optimal allocation of Distributed generation in distribution systems.

Wind Industry Focus: ETAP Wind Turbine Generator

Wind Industry Focus: ETAP Wind Turbine Generator

Power engineers are using ETAP to model wind turbine generators, model turbine and controller characteristics for dynamic stability analysis, and calculate megawatts (MW) and reactive power generation based on wind speed and turbine characteristics.

Hazards of Single-Phase Arc Flash

Hazards of Single-Phase Arc Flash

This article presents different methods for assessing the hazards of high- and low-voltage 1-phase equipment. One common question being asked is how to determine the hazard level associated with 1-Phase (1-P) Arc Flash (AF) incidents. There is very little information about this type of circuit in the available guidelines such as CSA Z462-08, NFPA 70E 2009 & IEEE 1584 2002. If the right risk level is not properly determined, we run the risk of over-protecting or under-protecting personnel that are working on this type of electrical system. The objective of this article is to present different methods for assessing the hazards of high and low voltage 1-P equipment, and to justify the results taking into consideration the behavior of arc faults at different voltage levels.

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