Lightning and Static Electricity
Each stationary and portable steel derrick and mast in use where flammable vapors or gases are present (or may escape to the atmosphere in sufficient quantity that the ignition would endanger the safety of employees) should be effectively grounded to a ground pipeline, well casing, or other equivalent source of grounding.
Where not effectively grounded or bonded by contact or connection, provisions should be made to prevent the accumulation of a static electrical charge, which could create a source of ignition in the presence of flammable vapors or gases.
Conductors, used for bonding and grounding stationary equipment or conductors should be of copper wire no smaller than No. 8 American Wire Gauge. Bonding and grounding clamps or clips should be attached with secure and positive metal-to-metal contact.
Knowledge Check Choose the best answer for the question.
4-4. What should be effectively grounded to a ground pipeline, well casing, or other equivalent source of grounding where dangerous flammable vapors or gases are present.
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