Cal. Code Regs. tit. 8 § 7166
Current through Register 2024 Notice Reg. No. 50, December 13, 2024
When a shaft-sinking or shaft-deepening operation reaches a depth of 100 feet below the shaft-sinking hoist, a telephone system shall be installed for communication between the shaft crew and the hoistman.
It is recommended that a portable type of telephone be provided for the shaft crew so that it can be kept near their working place during working hours.
Cal. Code Regs. Tit. 8, § 7166