California Code, Labor Code - LAB § 7152

(a) Furnish safety lines to tie all hooks and hangers back on the roof of such building or structure.

(b) Provide safety lines hanging from the roof, securely tied thereto, for all swinging scaffolds which rely upon stirrups of the single point suspension type to support the working platform. One such line shall be provided for each workman with a minimum of one line between each pair of hangers or falls.

The standards board may adopt occupational safety and health standards different from the requirements of this section or grant variances from these requirements if the standards or variances provide equivalent or superior safety for employees.