California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 20 - Tunnel Safety Orders
Article 9 - Emergency Plan and Precautions
Section 8428 - Telephone System
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Communications
(b) Telephone systems shall be independent of the tunnel power supply and shall be installed so that the destruction of one telephone will not interrupt the use of other telephones on the same system.
(c) Telephones shall be equipped with an audible or visual signal suitable for the conditions present and capable of adequately alerting the employees of an in-coming call. Equivalent communication systems may be used when accepted by the Division.
(d) Communication systems shall be tested upon initial entry of each shift to the underground, and as often as necessary at later times, to ensure that they are in working order.
(e) Telephone and low potential signal wire shall be protected from contacting energized power conductors or any other power source by isolation or suitable insulation, or both.
1. Amendment of section and new NOTE filed 3-5-96; operative 4-4-96 (Register 96, No. 10).
Note: Authority cited: Sections 142.3 and 7997, Labor Code. Reference: Sections 142.3 and 7997, Labor Code.