Arc Flash Calculations What Does It All Mean

Arc Flash Hazard Calculations – What does it all mean? Robert E. Fuhr, P.E. PowerStudies.com

Why are Arc Flash Hazard Studies Needed? ,[object Object],[object Object],[object Object]

OSHA Requirements ,[object Object],[object Object],[object Object],[object Object],[object Object]

Key References in NEC ® -2008 ,[object Object]

NEC 110.16 (continued) ,[object Object]

Key References in NEC ® -2005 ,[object Object]

NFPA 70E -Flash Hazard Analysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Industry standards and regulations: ,[object Object],[object Object],[object Object]

Arc Flash Hazard Analysis Key Steps ,[object Object],[object Object],[object Object],[object Object]

Arc Flash Hazard Analysis Key Steps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Acceptable & Informative Labels

Short Circuit Fault Study Coordination (PDC) Study Arc Flash Study Device Operating Time Arcing Fault Current 3 Phase Bolted Fault Current Arc Flash Label Energy Level Boundaries Required PPE Obtain Equipment Nameplate Data & Settings

Arc Flash Energy Calculation ,[object Object],[object Object],[object Object],[object Object]

Arc Flash Hazard Analysis Key Steps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Arc Flash Hazard Analysis Key Steps ,[object Object]

How a Short Circuit Study is Performed ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How a Short Circuit Study is Performed ,[object Object],[object Object],[object Object]

What is Protective Device Coordination (PDC) Study? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Goal #1 - Maximum Selective Coordination Between Equipment ,[object Object],[object Object],[object Object]

Goal #2 - Maximum Equipment Protection and Reduction in Arc Flash Energy ,[object Object],[object Object]

Maximum Equipment Protection ,[object Object],1 1 1

PDC Vocabulary ,[object Object],[object Object],[object Object]

PDC Vocabulary ,[object Object],[object Object]

Fuse TCC 3-6 Sec 5 kA @15 kA This Fuse is Current Limiting – Clearing time is 0.004 seconds

Thermal Magnetic Trip Unit ,[object Object],[object Object],[object Object],[object Object]

Thermal Magnetic Breaker 20 kA 0.01-0.025 Sec 4 kA 20-50 Sec

Solid State Trip Unit ,[object Object],[object Object],[object Object],Current Sensors Rating Plugs Current Setting

Solid State Trip Unit ,[object Object],[object Object],Long Time Pickup (LTPU) Long Time Delay (LTD) Short Time Pickup (STPU) Short Time Delay (STD) Instantaneous (I) Short Time Delay I2T-IN (I2T)

Solid State Trip ,[object Object],[object Object],[object Object],100 kA 0.01-0.06 Sec 6 kA 0.08-0.12 Sec 30 kA 170-210 Sec

Time Current Curves ,[object Object],Current in Amperes X 100

Arc Flash Energy Calculations ,[object Object],[object Object],[object Object],[object Object]

Typical Assumptions for an Analysis ,[object Object],[object Object],[object Object]

Arc Flash Warning Labels ,[object Object]

Limited Approach Boundary: ,[object Object],[object Object],[object Object],[object Object]

Restricted Approach Boundary ,[object Object],[object Object]

Prohibited Approach Boundary ,[object Object],[object Object],[object Object],[object Object]

Arc Flash Label Installation ,[object Object],[object Object]

Need more Information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Thank you for your time! ,[object Object]

Arc Flash Calculations What Does It All Mean

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