Electrical Safety

ARC FLASH
ANALYSIS
Electrical ARC
Safety

FLASH ANALYSIS
ARC-FLASH
Electrical Safety
• As much as 80% of all electrical injuries are
burns resulting from an arc-flash and ignition...
ARC EXPOSURE ENERGY BASICS
Electrical Safety
• Exposure Energy is Expressed in cal/cm2
• 1 cal/cm2 Equals the Exposure on ...
Industry Standards and Regulations
Electrical Safety
• OSHA 29 CFR 1910 Subpart S
• OSHA Enforces NEC2002 110.16 & NFPA70E...
NEC 2002
110.16 Flash Protection.
Electrical Safety

Switchboards, panel boards, industrial control
panels, and motor cont...
Sample NEC Warning Article 110.16
Electrical Safety

WARNING

!
Arc Flash and Shock Hazard
Appropriate PPE Required
ARC Flash Analysis

Electrical Safety
•

OSHA 1910.132(d) Where work will be performed within the
flash protection boundar...
Sample NEC Warning Article 110.16
Electrical Safety
Electrical Safety
Approach Boundaries
Electrical Safety
Nominal System
Voltage Range

Limited Approach Boundary

Restricted Approach
Boundar...
NFPA 70E provides two choices for PPE
selection:
Electrical Safety
• Do an arc flash hazard analysis, and document
the inc...
Hazard Risk Category Tables
Electrical Safety
Hazard Risk Category Classification
Electrical Safety

• NFPA 70E – Hazard Risk 0
– This hazard risk category poses minima...
Methods of Reducing Hazard Risk
Electrical Safety

• Specifying Current Limiting Fuses on Low Voltage
Switchgear Breakers
...
What We Offer Our Clients
Electrical Safety
• Design of safer power systems while insuring
compliance with OSHA NFPA 70E s...
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Arc Flash Analysis Training by Illinois Institute of Technology

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Arc Flash Analysis Training by Illinois Institute of Technology

  1. 1. Electrical Safety ARC FLASH ANALYSIS
  2. 2. Electrical ARC Safety FLASH ANALYSIS
  3. 3. ARC-FLASH Electrical Safety • As much as 80% of all electrical injuries are burns resulting from an arc-flash and ignition of flammable clothing. • Arc temperature can reach 35,000°F - this is four times hotter than the surface of the sun Fatal burns can occur at distances over 10 ft.
  4. 4. ARC EXPOSURE ENERGY BASICS Electrical Safety • Exposure Energy is Expressed in cal/cm2 • 1 cal/cm2 Equals the Exposure on the tip of a finger by a Cigarette Lighter in One Second • An Exposure Energy of Only One or Two cal/cm 2 Will Cause a 2nd Degree Burn on Human Skin
  5. 5. Industry Standards and Regulations Electrical Safety • OSHA 29 CFR 1910 Subpart S • OSHA Enforces NEC2002 110.16 & NFPA70E • NFPA 70E-2000 • Requirements for shock and arc flash boundaries • Requirements for personal protective equipment • NEC 110.16-2002
  6. 6. NEC 2002 110.16 Flash Protection. Electrical Safety Switchboards, panel boards, industrial control panels, and motor control centers in other than dwelling occupancies, that are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field marked to warn qualified persons of potential electric arc flash hazards. The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment. FPN No. 1: NFPA 70E-2000, Electrical Safety Requirements for Employee Workplaces, provides assistance in determining severity of potential exposure, planning safe work practices, and selecting personal protective equipment. FPN No. 2: ANSI Z535.4-1998, Product Safety Signs and Labels, provides guidelines for the design of safety signs and labels for application to products.
  7. 7. Sample NEC Warning Article 110.16 Electrical Safety WARNING ! Arc Flash and Shock Hazard Appropriate PPE Required
  8. 8. ARC Flash Analysis Electrical Safety • OSHA 1910.132(d) Where work will be performed within the flash protection boundary, the flash hazard analysis shall determine, and the employer shall document, the incident energy exposure to the worker (in cal/cm2) • OSHA 1910.269(I)(6) Flame resistant (FR) clothing and PPE shall be used by the employee based upon the incident energy exposure associated with the specific task. • As an alternative, PPE requirements of NFPA 70E Part II 3-3.9 may be used in lieu of a detailed flash hazard analysis.
  9. 9. Sample NEC Warning Article 110.16 Electrical Safety
  10. 10. Electrical Safety
  11. 11. Approach Boundaries Electrical Safety Nominal System Voltage Range Limited Approach Boundary Restricted Approach Boundary Prohibited Approach Boundary Phase-to-Phase Exposed Moveable Conductor Exposed Fixed Circuit Part Includes Inadvertent Movement Adder 0 - 50 Not specified Not specified Not specified Not specified 51 - 300 10 ft. 0 in. 3 ft.6 in. Avoid contact Avoid contact 301 - 750 10 ft. 0 in. 3 ft.6 in. 1 ft. 0 in. 0 ft. 1 in. 751V - 15 kV 10 ft. 0 in. 5 ft.0 in. 2 ft. 2 in. 0 ft. 7 in. 15.1 – 36 kV 10 ft. 0 in. 6 ft.0 in. 2 ft. 7 in. 0 ft. 10 in. 36.1 – 46 kV 10 ft. 0 in. 8 ft.0 in. 2 ft. 10 in. 1 ft. 5 in. 46.1 – 72.5 kV 10 ft. 0 in. 8 ft.0 in. 3 ft. 3 in. 2 ft. 1 in. 72.6 – 121 kV 10 ft. 8 in. 8 ft.0 in. 3 ft. 3 in. 2 ft. 8 in. 138 – 145 kV 11 ft. 0 in. 10 ft.0 in. 3 ft. 7 in. 3 ft. 1 in.
  12. 12. NFPA 70E provides two choices for PPE selection: Electrical Safety • Do an arc flash hazard analysis, and document the incident energy exposure – IEEE 1584 – SKM (Arc Flash Evaluation Module) – ArcPro Software – Duke Power Cal/Flux Software • As an alternate, use the “Hazard Risk Category Classifications” table to choose the PPE level required for the task
  13. 13. Hazard Risk Category Tables Electrical Safety
  14. 14. Hazard Risk Category Classification Electrical Safety • NFPA 70E – Hazard Risk 0 – This hazard risk category poses minimal risk. • NFPA 70E – Hazard Risk 1 – This hazard risk category poses some risk. • NFPA 70E – Hazard Risk 2 – This hazard risk category involves tasks that pose a moderate risk. • NFPA 70E – Hazard Risk 3 – This hazard risk category involves tasks that pose a high risk. • NFPA 70E – Hazard Risk 4 – This hazard risk category represents tasks that pose the greatest risk.
  15. 15. Methods of Reducing Hazard Risk Electrical Safety • Specifying Current Limiting Fuses on Low Voltage Switchgear Breakers • Specifying ARC Resistance Medium Voltage Switchgear • Remote Control of Switchgear Breakers • High Resistance Grounding on Low Voltage and Medium Voltage (15kV and below) Systems
  16. 16. What We Offer Our Clients Electrical Safety • Design of safer power systems while insuring compliance with OSHA NFPA 70E standards and IEEE 1584 • Save time with the fully integrated Short Circuit, Time Current Coordination, Equipment Evaluation and Arc Flash Evaluation • Offer alternatives to reduce exposure to ARC Flash Energy.

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