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IEEE 1584-2002 Based on 300 laboratory tests |
IEEE 1584-2018 Based on more than 1,800 laboratory tests |
Eaton’s recommendation |
| Excluded <240V locations fed from transformers smaller than 125kVA | Further testing has shown that it may be possible for an arc to sustain at those locations, so the exception has been removed, thus expanding the analysis scope. While it is less likely for an arc to sustain at equipment locations below 240V with a short circuit current of 2000A, an arc flash is still possible. |
All 3 phase locations should be included in the arc flash scope and calculations. Even for locations with available short circuit current below 2000A, it is still possible for an arc to occur. Excluding small equipment should be determined on a case by case basis. |
Two vertical conductor configurations • Vertical conductors in open air • Vertical conductors in a metal box enclosure |
Five electrode configurations must be considered, adding complexity to the analysis. The equipment conductor and enclosure arrangement that most closely resembles the actual equipment electrode configuration must be identified for arc flash analysis Added configurations:
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Evaluate the type and class of equipment to determine the possible bus configurations that a worker would be exposed to. Identify the equipment conductor and enclosure arrangement that most closely resembles the actual equipment electrode configuration. Choosing the worst-case electrode configuration can lead to overly |
| Typical enclosure dimensions for various classes of equipment provided | Can now specify the actual equipment enclosure dimensions equipment for increased accuracy of calculation, in addition to several new typicalequipment classes. | Careful consideration and expertise is needed to determine cost-benefits of actual vs. typical dimensions While using actual field-measured values may result in more accurate results, consideration must also be given to the time, effort, and increase complexity in obtaining dimensions for all enclosures. Eaton recommends that this trade-off be considered when performing arc flash studies. |
Further testing has shown that it may be possible for an arc to sustain at those locations, so the exception has been removed, thus expanding the analysis scope.
While it is less likely for an arc to sustain at equipment locations below 240V with a short circuit current of 2000A, an arc flash is still possible.
Further testing has shown that it may be possible for an arc to sustain at those locations, so the exception has been removed, thus expanding the analysis scope.
While it is less likely for an arc to sustain at equipment locations below 240V with a short circuit current of 2000A, an arc flash is still possible.
Five electrode configurations must be considered, adding complexity to the analysis.
The equipment conductor and enclosure arrangement that most closely resembles the actual equipment electrode configuration must be identified for arc flash analysis
Added configurations:
• Horizontal conductors in open air
• Horizontal conductors in a metal box enclosure
• Vertical conductors that end at an insulating barrier
Evaluate the type and class of equipment to determine the possible bus configurations that a worker would be exposed to.
Identify the equipment conductor and enclosure arrangement that most closely resembles the actual equipment electrode configuration.
Choosing the worst-case electrode configuration can lead to overly conservative calculations.
Careful consideration and expertise is needed to determine cost-benefits of actual vs. typical dimensions
While using actual field-measured values may result in more accurate results, consideration must also be given to the time, effort, and increase complexity in obtaining dimensions for all enclosures. Eaton recommends that this trade-off be considered when performing arc flash studies.
