According to the 2100 questions provided by InterNACHI it seems electrical wires should not be less than 7’ abover grade:
I dont’ know how to reconcile that with the NEC which states outdoor recepticals should not be more than 6.5’ above grade:
210.52(E) Outdoor Outlets. Outdoor receptacle outlets shall be installed in accordance with (E)(1) through (E)(3). [See 210.8(A)(3).] (1) One-Family and Two-Family Dwellings. For a one-family dwelling and each unit of a two-family dwelling that is at grade level, at least one receptacle outlet accessible while standing at grade level and located not more than 2.0 m (6½ ft) above grade shall be installed at the front and back of the dwelling.
I’ve done some searching but I can’t find anythign outside of InterNACHI to explain this.