December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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251System Protection
• Incident energy in calories per square centimeter at various working distances
• Flash hazard boundaries for limited approach, restricted approach, and pro-
hibited approach
• Personal protection equipment (PPE) class for workers to wear doing live
work, such as wearing voltage-rated gloves and cotton underwear with re-
resistant (FR) shirt and FR pants and using properly selected tools
• Shock hazard in kilovolts when the cover is removed for live work
TABLE 9.7
Personal Protection Requirement for Various Arc Flash Energy Densities (in
cal/cm
2
)
NFPA-70E 2004 Equipment Requirements (Proposed)
Category Energy Level Typical P ...
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