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for example, where contractor welders work in enclosed spaces, the employer may consider arc flash hazards by estimating the likely arc gap based on the spacing between the welders and the work that is being performed. the employer could also consider the degree of insulation of the work that is being performed.table 8 provides the specific arc flash distances. for the enclosed arc, the spacing between two live parts (neighboring live parts or between live and grounded parts) generally decreases with increasing voltages and increasing temperatures. the encased arc can be thought of as a part of an enclosed arc; the arc gap distance for encased arcs is the same as for the enclosed arc. the spacing between hot and cold parts may also be affected by the temperature difference. as temperature increases, the spacings generally increase. however, due to the temperature dependence of arc properties, this trend is not true for all arcs.table 9 provides information on the spacing between live parts in different types of enclosure. for all types of enclosure, the distance between the hot and cold parts is dependent on the size of the enclosure and on the electrical/physical properties of the arc. generally, as enclosure size increases, arc gap distances decrease. figure 1 shows the relationship between the size of a panel and the typical arc gap distances in the various types of enclosure. the information provided here is intended to allow employers to use reasonable estimates of the potential arc gap distances.the employer should use, as appropriate, the values from tables 7 or 8 to perform the arc flash hazard calculations. where the information provided in tables 7, 8, and 9 is insufficient, the employer should consult table 3. ieee spectrums calculations using spacexs most up-to-date information suggests that the overall risk of debris from the constellation causing an injury or death will be 45 percent.
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