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Subchapter 7. General Industry Safety Orders
Group 18. Explosives and Pyrotechnics
Article 118. Explosives for Well Service Industry

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§5314. Firing with Electricity--Well Site.

(a) Before implementing any system of electrical firing, the licensed blaster shall conduct a thorough survey for extraneous currents, and all dangerous currents shall be eliminated before any loading is accomplished.

(b) The firing circuit shall be effectively shorted following testing and remain shorted until the explosive device is lowered below the surface of the well.

(c) Well casing, service unit and rig, shall be connected and effectively bonded to minimize stray currents.

(d) Warning signs shall be posted at all entrances to the well site with lettering “RADIO TRANSMITTING PROHIBITED IN THIS AREA” or equivalent. Lettering of the sign shall be at least 4 inches high in red letters with a 5/8-inch stroke on a white background.

(e) Perforating shall not be knowingly conducted closer to any operating mobile or fixed radio, television, or radar transmitter than shown in tables in Section 5306, unless special precautions are taken that are acceptable to the Division.

(f) Employees shall be prohibited from entering the cellar after blasting until any toxic vapor/fumes, dust and gasses have been reduced to safe limits.


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


1. Amendment of section and new Note filed 7-11-2003; operative 8-10-2003 (Register 2003, No. 28).

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