
1910.269 Appendi x E reco gnizes the NESC as a national consensus standard that may be
followed
. in complying with the more performance-oriented requirements of OSHA’s final rule.
Part 2 of the NESC establishes minimum loading criteria for wind and ice loading on overhead
conductors and structures. Rule 250 in that document establishes overload factors for
structures, crossarms, guys, foundations, and anchors. NESC Rule 260 establishes strength
requirements and safety factors for metal, prestressed-concrete, reinforced-concrete, and wood
structures. The Rule also establishes minimum strength requirements for insulators. Strength
factors for crossarms ...