The conduit systems shall provide a satisfactory groundcontinuity path to all metallic equipment and parts in hazardous areas. Nfpa 33 spray painting also specifies a maximum of 1 megohm for bonding and grounding. Mdl15 combustible dust airvac meets nfpa 772007 standard. Consent standard not presented at nfpa technical meeting. Eliminate static electric charges by bonding and grounding. Channeling static electricity by bonding and grounding drums, tanks and containers takes away more than just that tingly feeling after a shock. Justrites guide to safe grounding and bonding practices. Use the drop down menu above to select the edition year you need.
Manage the flow rates and flow velocities of liquids when they are transferred. However the common practice of grounding to a common point usually earth potential and bonding all process piping and vessels. Chapter 7 deals with buildings containing flammable materials, not the stroage vessels within the buildings. Bonding and grounding requirements meet nfpa 772007 recommended practice on static electricity. Typical grounding system for small volume solvent dispensing via drum pump. A bonding system connects various pieces of conductive equipment together to keep them at the same potential. This guide answers some common questions about grounding and bonding, and will help you apply these principles and. Grounding and bonding in hazardous areas shall conform to nfpa 70, articles 501. Requirements for grounding and bonding shall follow nfpa 780 and nfpa 77 standards to be compliant. Verified grounding for safety in hazardous locations. Nfpa 70 national electrical code 1 article 250 provides information on system grounding. Nfpa 77 update makes hazmat bondinggrounding much easier. The national fire protection association does not approve, inspect or certify any installations, procedures, equipment, or materials nor does it approve evaluate testing laboratories.
Nfpas 2011 electrical grounding and bonding video facilitates training new employees and is an excellent refresher course for experienced professionals. The process of bonding one or more conductive objects to the ground, so that all objects are at zero 0 electrical potential. Recommended practice on static electricity, 2019 edition has been released. Nfpa 77 recommended practice on static electricity. Osha would consider compliance with the suggestions of nfpa 77 1993 regarding the bonding and grounding of plastic containers holding class i flammable liquids as compliance meeting the intent of oshas standards in 29 cfr 1910.
Description nfpa 77, recommended practice on static electricity 2019. Nfpa 77, recommended practice on static electricity, 2019. Nfpa 77, recommended practice on static electricity. If you have equipment that is generating flammable waste into drums, make sure that the drums are properly grounded. The fulllength brass flame arrester minimizes splashing, friction, and the buildup of static in the fluid. Bonding and grounding installation of grounding and bonding. Bonding and grounding when dispensing flammable liquids. Verify bonding of other systems to facility grounds upon new installation, installation or upgrade of other systems requiring grounding, and prior to contract acceptance bce nfpa 70 nec. Nfpa 70 and nfpa 780 specify the size and shape of ground rods and other shapes e. Thmg042 grounding and bonding, part ii the haz mat guys. To manage static electricity when dispensing flammable liquids into plastic drums, use justrites large steel drum funnel with a 32inch flame arrester. Lightning that emerges in the clouds and strikes the ground is an. Manage static electricity where ignitable dusts or vapors are present.
Flammable and combustible liquids storage requirements. Bonding and grounding of plastic containers during transfer of class. A tentative edition of nfpa 77 adopted in 1941 was further revised and officially adopted in 1947. Help prevent ignition of flammable vapors, dust, and particulates by grounding and bonding according to the best practices in nfpa 77. This feature provides equipment specifiers with the ability to demonstrate compliance with the grounding and bonding recommendations of nfpa 77, api rp 2003 and iec 6007932. But the electrical principles on which we base grounding and bonding can be confusing. Nfpa 77 recommended practice on static electricity, 2000 edition. National fire protection agency nfpa addressed the need for grounding and bonding in nfpa 30 flammable and combustible code chapter 18, 5. What is clear from the recommendations of nfpa 77 and api rp 2003 is that 10 ohms in the grounding and bonding circuit is the maximum resistance recommended for equipment at risk of electrostatic charging in hazloc atmospheres.
Osha would consider compliance with the suggestions of nfpa 771993 regarding the bonding and grounding of plastic containers holding class i flammable liquids as compliance meeting the intent of oshas standards in 29 cfr 1910. Helpful tips for correctly grounding type c fibc bags. Grounding and bonding with nfpa 77 as a guide is essential to safety in many industrial environments. Economical wires provide secure grounding for storage and transfer of flammables. The 2019 edition of the nfpa static electricity recommended practice, nfpa 772019. When properly connected by grounding or bonding wires, the funnel keeps the fluid. Nfpa 77, recommended practice on static electricity, also provides recommendations for bonding and grounding practices. Api rp 2003, protection against ignitions arising out of static, lightning, and stray currents.
Where the bondinggrounding system is all metal, resistance in continuous ground paths typically is less than 10 ohmsgreater resistance usually indicates that the metal path is not continuous, usually because of loose connections or corrosion. National fire protection agency nfpa addressed the need for grounding. Typical industrial vacuum cleaning applications for the mdl15 include high volume cleanup of powders and combustible dusts from floors, walls, machinery and overhead surfaces typically found in the food, pharmaceutical, chemical and general. Whether it is for lightning protection purposes, electrical fault protection or ensuring electronic equipment can function correctly, the resistance of the electrode to the general mass of the earth can vary. Pay careful attention to the definitions that apply to grounding and bonding both here and in article 100 as you begin the study of this important article. 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. Static electricity standards hazards of static electricity newson. Ensure that the grounding system selected can check and continuously monitor the full range of resistance through the bag. Reduces static sparks generated by the movement and flow of flammable liquids. Nov 08, 2018 the 2019 edition of the nfpa static electricity recommended practice, nfpa 77 2019. When we think of electricity coursing through the air, our minds often conjure the image of a lightning bolt.
Nov 05, 2014 the 2014 edition of nfpa 77, recommended practice on static electricity, will make establishing a grounding field much easier for hazardous materials responders. Grounding provides a continuous and uninhibited path for charges generated during the transfer operation to flow to earth. Table of contents 2019 current edition nfpa 77 recommended practice on static electricity, 2019 edition. Use purposebuilt grounding and bonding clamps, cables, and assemblies as illustrated in nfpa 77, as it is preferred to standard welding, battery or alligator clips. Nov 14, 2018 grounding is the process of bonding 1 or more conductive objects to the ground, so that all objects are at zero 0 electrical potential. Bonding and grounding conductors must be large enough to withstand mechanical damage and must not be smaller than 6 awg copper. Nfpa 77, recommended practice on static electricity 2019. Nfpa s 2011 electrical grounding and bonding video facilitates training new employees and is an excellent refresher course for experienced professionals. Electrical grounding and bonding are important safety practices for preventing static discharge and reducing the possibility of a fire. How to correctly ground type c fibcs powderbulk solids. Ensure type c bags are manufactured in accordance with the electrostatic recommendations of iec 64044nfpa 77 or clctr. This feature provides equipment specifiers with the ability to demonstrate compliance with the grounding and bonding recommendations of nfpa 77, api rp 2003 and iec 60079321. Keep in mind that the term earthing is not currently a defined term. Nfpa 77 recommended practice on static electricity aimcal.
For additional information national fire protection association. Effective groundingbonding for fire prevention ground all containers for extra safety in the handling of containers of flammable liquids having high electrical resistance and low flash points, possible loss of life, loss of property and interruption to business can be greatly minimized by effective grounding and bonding of the containers. Nfpa 77, recommended practice on static electricity 2019 ed. Its a timesaving and effective way to conduct grounding and bonding training based on your companys projects and timeframe. Chapter 7 control of static electricity and its hazards by process modification and grounding 7. Telecommunications industry association, tia jsto607a commercial building grounding earthing and bonding requirements for telecommunications 4. Bonding and grounding of plastic containers during transfer. Grounding plate is a metal plate used to provide a bond for the receiving container. Grounding for flammable cabinet storage the building code forum. Earthrite plus welcome to static earthing solutions pvt.
Comply with nfpa 70, article 250, for types, sizes, and quantities of equipment grounding conductors, unless specific types, larger sizes, or more conductors than required by nfpa 70 are indicated. Standard materials do not always have the positive spring pressure and durable sharp contacts required to provide an effective bond. Static sparking cannot take place between objects that are the same potential. Static protection through bonding and grounding iaei magazine. Nov 29, 2016 nfpa 77 2014 edition recommended practice for static electricity 7. The transfer of class i flammable liquids between small containers may not require the use of special bonding and grounding techniques. Nfpa 77 does not specify a minimum conductor size for normal static electricity dissipation and control, only a maximum resistance of 1 megohm 1,000,000 ohms. Cant really help you with nfpa 79, but what i can tell you is that nfpa 70 lists what is acceptable to use as an equipment grounding conductor in 250. Jan 22, 2016 helpful tips for correctly grounding type c fibc bags. The 2014 edition of nfpa 77, recommended practice on static electricity, will make establishing a grounding field much easier for hazardous materials responders. Nfpa 77 recommended practice on static electricity is another important document that offers guidance on identifying, evaluating, and controlling static electric hazards for purposes of preventing fires and explosions 4. Cooper cable insulated bondinggrounding wires new pig.
Oshas requirements for bonding and grounding in general industry are referenced in the flammable liquids standard, 29 code of federal regulation cfr 1910. Static electricity has not been shown to create hazards in pure phosgene areas. Ahjs not understanding the difference between grounding and bonding. A driver of a chemical supplier was delivering a load of product to a customer. Click here to purchase the full version from the ansi store. Ufc 357501 lightning and static electricity protection systems. Buy nfpa 77, recommended practice on static electricity. Nfpa 77 2014 edition recommended practice for static electricity 7. When testing ground and bond circuits, a resistance of 1 megohm 10 to the 6th power or less is considered adequate per nfpa 77. Bonding and grounding is a very effective technique for minimizing the likelihood of an ignition from static electricity.
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