RCW 49.24.340
Electrical voltage.
In electrical systems installed, no higher voltage than low voltage shall be used underground, except for transmission or other application to transformers, motors, generators or other apparatus in which the whole of the medium or high voltage apparatus is stationary.
[ 1941 c 194 § 27; Rem. Supp. 1941 § 7666-35.]
Structure Revised Code of Washington
Chapter 49.24 - Health and Safety—Underground Workers.
49.24.020 - Compressed air safety requirements.
49.24.030 - Medical and nursing attendants.
49.24.040 - Examination as to physical fitness.
49.24.080 - Requirements for underground labor.
49.24.100 - Lighting appliances.
49.24.130 - Air chambers—Hanging walks.
49.24.150 - Explosives and detonators.
49.24.160 - Air plant—Feed water.
49.24.170 - Electric power requirements.
49.24.190 - Cars, cages, buckets—Employees riding or walking.
49.24.200 - Speed of vehicles.
49.24.210 - Oil supply restricted.
49.24.220 - Explosives, use of—Blasting.
49.24.230 - Firing switch—Warning by blaster.
49.24.240 - Inspection after blast.
49.24.260 - Requirements as to caissons.
49.24.270 - Shields to be provided.
49.24.280 - Caissons to be braced.
49.24.290 - Cages—Hoisting apparatus.
49.24.300 - Buckets in vertical shafts.
49.24.310 - Telephone system for tunnels.
49.24.320 - Location of lights.
49.24.330 - Generators, transformers, etc., to be grounded.
49.24.340 - Electrical voltage.
49.24.350 - Lamps to be held in reserve.
49.24.360 - Insulators required.