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Effect of Electrode Orientation in Arc Flash Testing
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From Ferraz Shawmut
The arc flash hazard calculation method proposed in IEEE 1584 is based on tests with the arcing electrodes in a vertical plane and the calorimeters arranged at 90° to this plane. In this paper the results of tests using the IEEE test set-up with both vertical and horizontal electrodes are given. High-speed videography and incident energy measurements show that the arc flash hazard is much worse with the horizontal orientation. However current-limiting fuses are effective in limiting the incident energy, even in worst-case arcing conditions, provided that the bolted-fault current is high enough to cause them to operate in their current-limiting mode. The incident energy values are shown to depend on the size of the trigger fuse wire used. The effect of phase imbalance is also considered. Products & Services
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Topics of Interest
Current-limiting fuses can limit arc flash incident energy to low values provided that the arcing fault current exceeds the fuse's threshold current. Threshold current is defined as the lowest...
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Conventional arc flash hazard calculators use simple formulae to calculate the flash protection boundary and the incident energy density, but these methods do not represent the effects of the power...
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Current limiting fuses can reduce both the magnitude and duration of a fault current. A UL Listed, current limiting fuse must clear a short circuit current in less than one half cycle in its current...
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Arc flash incident energies can often be significantly reduced by simply replacing UL Class RK5, Class K, and Class H fuses with A6D UL Class RK1 fuses. This is an easy and inexpensive solu¬tion,...
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Based on previous statistics, it's expected that the explosive energy released during arcing faults will send more than 2,000 American workers to burn centers this year. Most of these people will not...
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