Cal. Lab. Code § 6324
The application to the superior court accompanied by affidavit showing that the division has grounds to issue a citation pursuant to Section 6317 or a place of employment, machine, device, apparatus, or equipment is being operated in violation of a safety order or standard or in violation of Section 25910 of the Health and Safety Code, that the use or operation constitutes a menace to the life or safety of any person employed thereabout, and accompanied by a copy of the statute, order, or standard applicable thereto is a sufficient prima facie showing to warrant, in the discretion of the court, the immediate granting of a temporary restraining order. A bond shall not be required from the division as a prerequisite to the granting of any restraining order.
Ca. Lab. Code § 6324