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NFPA 70E Section 120.3(B) Accommodation states, “Temporary careful accomplishments accessories shall be able of administering the best accountability accepted that could breeze at the point of accomplishments for the time all-important to bright the fault.” If the ampacity of any allotment of the arena set is bare (cable, ferrule, or clamp) or if the affiliation has aerial impedance due to a poor affiliation or defect, the claimed careful arena array could “fuse.” That’s a adorned way of adage it will melt. Actually, it would apparently vaporize, causing an arc flash. ASTM F-855, “Standard Specifications for Temporary Careful Grounds to Be Acclimated on De-energized Electric Power Lines and Equipment,” Table 1, provides the appropriate cable sizes to accommodated the requirements of this paragraph. Table 2 is acclimated back applications accept a aerial X/R ratio. There are two ratings accustomed in Table 1, “withstand” and “ultimate.”
From ASTM F-855:
Table 1 from ASTM F-855Standard Specifications for Temporary Careful Grounds to Be Acclimated on De-energized Electric Power Lines and Equipment
This commodity originally appeared in the June 2013 affair of Occupational Health & Safety.
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