NFPA 77-2019 Recommended Practice on Static Electricity

NFPA, 2019. — 78 p.Mitigate static electricity hazards. Help prevent ignition of flammable vapors, dust, and particulates by grounding and bonding according to the best practices in NFPA 77.A buildup of static electricity can be a considerable hazard -- it can discharge in air and ignite flammable vapors and dust. NFPA 77, Recommended Practice on Static Electricity provides important information on evaluating and controlling static electric hazards to help protect those working where these hazards can be present.NFPA 77 offers guidance on how to:Eliminate static electric charges by bonding and grounding.
Manage static electricity where ignitable dusts or vapors are present.
Manage the flow rates and flow velocities of liquids when they are transferred.
This recommended practice covers industries as diverse as chemical processing, petroleum refining, printing, and calendaring. It includes answers to questions about properly bonding and grounding a container, and how to determine whether a static electricity hazard poses a risk.The 2019 edition of NFPA 77 is up-to-date with referenced documents and the latest safety knowledge including:Updates to reference documents, Chapter 2, and Annex I reflect current editions.
Changes to the definitions for combustible dust and grounding reflect the use of the terms specific to NFPA 77.
Changes to the characterization of low, medium, and high resistivity powders in Chapter 15 reflect generally accepted international standards.
Grounding and bonding with NFPA 77 as a guide is essential to safety in many industrial environments.This recommended practice offers guidance on identifying, evaluating, and controlling static electric hazards for purposes of preventing fires and explosions.1.1 Scope. 1.1.1 This recommended practice applies to the identification, assessment, and control of static electricity for purposes of preventing fires and explosions. 1.1.2* This recommended practice does not apply directly to shock hazards from static electricity. However, application of the principles set forth in this recommended practice can reduce such shock hazards to personnel. 1.1.3* This recommended practice does not apply to the prevention and control of static electricity in hospital operating rooms or in areas where flammable anesthetics are administered or handled. 1.1.4* This recommended practice does not apply to lightning. 1.1.5* This recommended practice does not apply to stray electrical currents or to induced currents from radio frequency (RF) energy. 1.1.6* This recommended practice does not apply to fueling of motor vehicles, marine craft, or aircraft. 1.1.7* This recommended practice does not apply to cleanrooms. 1.1.8 This recommended practice does not apply to control of static electricity and static electricity hazards involved with electronic components, which have their own requirements.