AS 18.60.670 — 18.60.695 do not apply to
- (1) activities relating to high voltage overhead conductors or their supporting structures conducted by persons authorized by the operator or owner of high voltage overhead conductors or their supporting structures;
- (2) work done on telephone or communication circuits or their supporting structures;
- (3) the operation or maintenance of equipment traveling or moving upon fixed rails of a railroad; or
- (4) emergency situations in which life is endangered.