1. (a) Processes or operations involving the use of oxidizing agents such as chlorates, perchlorates or peroxides, shall be effectively grounded.

2. (b) The nozzle of air, high pressure water cleaning systems, grit cleaning systems, inert gas and steam lines or hoses, when used in the cleaning or ventilation of tanks and vessels that may contain hazardous concentrations of flammable gases or vapors, shall be grounded and bonded to the tank or vessel shell. Bonding devices shall not be attached nor detached in hazardous concentrations of flammable gases or vapors. Before starting work, precautions shall be taken to prevent ignition of flammable atmospheres in tanks and vessels in accordance with the requirements of Section 5420 of these Orders.

   Exception: High pressure water cleaning system nozzles used to clean tanks or vessels 100 cubic meters or less in size need not be bonded to the tank or vessel shell, provided all conductive components are grounded and it is not possible for steam to enter the tank or vessel.

3. (c) Bonding and grounding devices which are temporarily clamped or clipped to movable equipment shall have a conductor of ample length to assure the effective attachment of the device.
4. (d) When attaching bonding and grounding clamps or clips, a secure and positive metal to metal contact shall be made. Such attachments shall be made before closures are opened and substance movements are started and shall not be broken until after substance movements are stopped and closures are made.
5. (e) Steam Cleaning. Steam cleaning components shall be conductive and grounded. The conductive components of the tank or vessel shall be grounded and bonded.

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.

History

1. Amendment filed 12-10-87; operative 1-9-88 (Register 87, No. 51).

2. Amendment of subsection (b) and new subsection (e) filed 8-26-2008; operative 9-25-2008 (Register 2008, No. 35).

3. Editorial correction of subsection (b) (Register 2008, No. 39).