California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 6 - Elevator Safety Orders
Group II - Elevator Installations for Which the Installation Contract Was Signed Before October 25, 1998
Article 18 - Design Data, Formulas, Tests on Approved Devices, and Electrical Regulations
Section 3110 - Approval of Hoistway Door Interlocks and Hoistway Door Combination Mechanical Locks and Electric Contacts (Contact Locks)

(1) Hoistway door interlocks or hoistway door combination mechanical locks and electric contacts used on installations covered by these regulations shall be of an approved type. The Division of Industrial Safety will classify as "Approved" such hoistway door locking devices that have been approved, listed, labeled, or manufactured as conforming to the standards of the Underwriter's Laboratories, Inc., or similar approved institutions, provided, however, that the division may refuse to approve such devices that do not comply with the requirements of Section 3021.

(2) The division may classify as "Approved" hoistway door locking devices which have not been approved, listed, labeled, or manufactured as conforming to the standards of one of the institutions specified in Section 3110(a)(1) upon satisfactory evidence that they are designed and constructed so that they do comply with the requirements of Section 3021.