Chapter 4: Division of Industrial Safety Subchapter 6: Elevator Safety Orders (Sections 3000 - 3146) Group 2: Existing Elevator Installations (Sections 3010 - 3113) Article 18.: Design Data, Formulas, Tests on Approved Devices, and Electrical Regulations (Sections 3100 - 3113) Section 3110: Approval of Hoistway Door Interlocks and Hoistway Door Combination Mechanical Locks and Electric Contacts (Contact Locks).
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