You must make sure an effective two-way voice communication system is provided between the equipment operators and persons stationed within the building.
Wash. Admin. Code § 296-870-60055
Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 47.17.060. 06-19-075, § 296-870-60055, filed 9/19/06, effective 1/1/07.