OSHA 1910.269(l)(8)(ii) Note 2 contains this statement: "For example, the employer could estimate the heat energy just outside a substation feeding a radial distribution system and use that estimate for all jobs performed on that radial system."
Therefore, it seems that one could go maybe a couple pole spans outside the substation and determine the incident energy and use that for entire circuit. My concern would be that as one goes farther out on a distribution circuit the fault current lowers and the clearing time increases so that it could be possible that the incident energy is higher away from the substation.
Thoughts/opinions on using an estimate near the substation for the entire circuit?
Therefore, it seems that one could go maybe a couple pole spans outside the substation and determine the incident energy and use that for entire circuit. My concern would be that as one goes farther out on a distribution circuit the fault current lowers and the clearing time increases so that it could be possible that the incident energy is higher away from the substation.
Thoughts/opinions on using an estimate near the substation for the entire circuit?