California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 7 - General Industry Safety Orders
Group 11 - Electric Welding
Article 90 - Electric Welding, Cutting and Heating
Section 4852 - Resistance Welding

(a) All suspended portable welding gun equipment, with the exception of the gun assembly, shall be equipped with a support system capable of supporting the total shock load in the event of failure of any component of the supporting system.

NOTE: The system should be designed to be fail-safe. The use of devices such as secondary cables, chains, clamps, etc., is considered satisfactory.

(b) Where it enters the gun frame, the movable holder mechanism shall be designed so as to present no shear points to the fingers placed on the operating movable holder; otherwise, guarding shall be provided.

(c) One or more safety emergency stop buttons shall be provided on all multi-spot welding machines, with a minimum of one stop button at each operator's position.

(d) Periodic inspection of resistance welding equipment shall be made by qualified personnel and a certification record maintained. The certification record shall include the date of the inspection, the signature of the person who performed the inspection, and the serial number or other identifier of the equipment inspected. The operator shall be instructed to report equipment defects to the supervisor.