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Device Rating
System Voltage
Arc Gap
Fault Current
Distance to Arc
Fuse
Circuit Breaker
Flash Boundary
PPE Level
Hazard Category
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The following steps are
required for an Arc-Flash Hazard Analysis:
1. Calculate the available 3-phase bolted Fault Current available at every
point in the system where workers may be exposed to energized (hot) system
components.
2. Determine the Device Rating.
3. The Littelfuse Arc-Flash Calculator Program will determine the arcing current
using the input data. Default values are: 600 volts AC, 1.25” arc gap, 18”
distance from arc to receiving surface. The options are explained in the
links to the left.
4. Calculate the Incident Energy. (Hit ‘Solve’ button after selecting
Device Rating, System Voltage, etc.)
5. Read the Flash Protection Boundary.
6. Select PPE required from Calculator.
All of the information and formulas contained in the Littelfuse Arc-Flash
Calculator program are believed to be accurate. However, Littelfuse, Inc. makes
no warranty, express or implied for its use. This includes warranties of
merchantability and/or fitness for a particular purpose. Littelfuse does not
warrant, guarantee or make any representations regarding the use of the
Littelfuse Arc-Flash Calculator in the terms of its correctness, accuracy,
reliability, or otherwise. The user assumes the entire risk of its
performance and accuracy for a given purpose.
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