Electrical engineering courses

Arc flash protection for electrical safety professionals

Ref No: 2015026

Electrical safety is an important issue for those working on electrical facilities in utility networks and large industrial installations. A number of serious accidents including fatalities occur every year due to accidents involving electricity resulting in huge financial losses and wasted man-hours. Arc flashes in electrical equipment are now considered one of the major causes of electrical accidents even surpassing the well known hazards of electric shock.
 Avoiding arc flash incidents and the resulting injuries is one of major challenges today facing electrical workers and requires adequate attention in the stages of system planning, design, installation, operation and maintenance.
Injuries due to arc flash can depend on many factors, one of which is the incident thermal energy on a worker exposed to a flash. Today, a considerable body of knowledge exists as a result of research efforts and is available to designers and maintenance engineers in the form of standards such as IEEE 1584 and NFPA 70E. This course will detail the basis of this approach and also about the major advances have been made in the area of PPE made of HR fabrics and rated for different levels of thermal exposure.
Prevention however still remains the best form of protection and switchgear manufacturers have made considerable design advances to ensure that the effect of arc flash incidents is contained within the enclosure of switchgear (often called arc flash resistant switchgear) and methods of testing such switchgear have also evolved simultaneously. Another important factor is the approach to avoid arc incidents within the switchgear by proper design and maintenance and techniques to reduce the severity of the flash should such incidents occur.
This course will cover the requirements for work practices that workers should use to avoid injury from a release of electrical energy when performing tasks involving electrical power.  The specific information enables the reader to prevent or minimize exposure to all widely recognized electrical hazards.

OBJECTIVES 
 At the end of this workshop delegates will understand:
- Identify the important hazards in O&M work in different parts of electrical installations
- Recognize the dangers of arc flash events to working personnel and their impact on equipment
- Know the codes and standards dealing with arc flash danger
- Acquire the necessary theoretical knowledge to carry out arc flash impact studies by collecting system data and computing the arc flash incident energy and flash protection boundary
- Understand the importance of proper design of electrical equipment in avoiding arc flash incidents and ensuring safety in the event of an arc flash.
- Select appropriate Personal Protective Equipment (PPE) and FR clothing required for avoiding serious or lethal injuries
 

 

CHAPTER 1: ELECTRICAL HAZARDS
1- History
2- Importance of grounding
3- Grounding classification
4- Earth, ground and neutral
5- Definitions
6- Conditions of danger
7- Hazard analysis
8- Electric shock
9- Affected body parts
10- Factors affecting electric shock
11- Electric arc
12- Electric arc blast
13- Reasons for arc flash
14- Electric insulation (protection against electric shock)
15- The role of overcurrent protective devices in electrical safety

CHAPTER 2: FUNDAMENTALS OF POWER SYSTEMS
1- Introduction
2- Common distribution options
3- Main components of an industrial distribution system
4- Voltage classification
5- Multiple voltage levels in power distribution
6- Types of distribution arrangements and redundancy
7- Faults in electrical systems
8- Short circuit currents
9- Bolted vs. Arc fault currents
10- Earthing and its influence on arc faults
11- System earthing
12- Influence of earthing on arc faults

CHAPTER 3: SIMPLE CALCULATION OF SHORT CIRCUIT CURRENTS
1- Introduction
2- Distinctions between load and fault currents
3- Sources of short circuit currents
4- Machine reactances during transients
5- Fault typology
6- Symmetrical and asymmetrical currents
7- Calculation of short circuit mva
8- Three phase short-circuit current calculations, procedures and methods
9- Ohmic reactance method
10- Percentage reactance method
11- Per unit method
12- Cable information

CHAPTER 4: PROTECTION OF ELECTRICAL POWER SYSTEMS
1- Need for protective apparatus 
2- Basic requirements of protection 
3- Basic components of a protection system 
4- Protection of power distribution systems 
5- Detection of fault currents 
6- Fuses for protection 
7- Protective relays 
8- Electromechanical protection relay 
9- Electronic protection relays 
10- Coordination of protection 

CHAPTER 5:  ARC FLASH STUDIES-CODES AND STANDARDS:
1- Introduction
2- Safety standards for arc flash hazards 
3- Research in arc flash hazards 
4- Basic requirements stipulated in standards for operator safety 
5- National fire protection hazards (nfpa) national electrical code (nec) 2002
6- Nfpa 70b 2002
7- Osha standards 29-cfr, part 1910
8- The institute of electronics and electrical engineers (ieee standard 1584)
9- Guide for arc flash hazard analysis 
10- Limitations 
11- Difference between nfpa 70e and ieee 1584
12- Summary

CHAPTER 6: ARC FLASH STUDY DETAILED PROCEDURE
1- Flash protection approach boundary 
2- Calculated boundaries based on transformer size and bolted short circuit mva 
3- Flash hazard analysis 
4- Flash hazard analysis methods
5- Flash hazard analysis – method 1 
6- Flash hazard analysis – method 2
7- Flash hazard analysis – method 3
8- On-line arc-flash calculator 
9- Difference between nfpa 70e and ieee 1584 
10- Calculation approach 
11- Warning labels 
12- Personal protective equipment 


CHAPTER 7: CONTROLLING ARC FLASH HAZARDS
1- Electrical safety model 
2- Recognizing hazards 
3- Evaluating hazards 
4- Control hazards 
5- Ground fault interrupting methods 
6- Workspace 
7- Safety approach 
8- Electrically safe work condition 
9- Energized or de-energized 
10- Ip protection
11-  preventing accidental electrical contact
12- Summary – hazards & protections

CHAPTER 8: ELECTRICAL SAFETY EQUIPMENT
1- Introduction
2- General inspection and testing requirements for electrical safety equipment
3- Flash and thermal protection
4- Head and eye protection
5- Rubber-insulating equipment
6- Hot sticks
7- Insulated tools
8- Barriers and signs
9- Safety tags, locks, and locking devices
10- Voltage-measuring instruments
11- Safety grounding equipment
12- Ground fault circuit interrupters
13- Safety electrical one-line diagram
14- The electrician's safety kit

 

This course is designed for personnel who want to understand the safety principles and work
practices. Those who will benefit the most from this workshop include the following:
- Electrical Engineers
- Consulting Engineers
- Electrical Maintenance Engineers
- Safety Engineers
- Project Engineers
- Power System Protection and Control Engineers
- Electrical and Instrumentation Technicians

 

Trainees shall receive a portfolio containing a comprehensive course manual.

Attendees shall receive a certificate of attendance from AMAD Tech.