Arizona Administrative Code (Last Updated: November 17, 2016) |
Title 11. MINES |
Chapter 1. STATE MINE INSPECTOR |
Article 7. TRAVELWAYS AND ESCAPEWAYS |
Section R11-1-714. Telephone or other voice communications pro- vided underground
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Telephone or other voice communications shall be provided between the surface in any underground refuge chambers and such systems shall be independent of the mine power supply.