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This includes not only safeguarding equipment and facilities from damage or improper operation, but it also includes the safety of personnel who may be exposed to the hazards inherent with any electrical installation. Relative to safety of personnel, consideration for some form of ground-fault protection must be made to prevent current flow through the body due to line-to-ground faults.
This is not to be confused with ground-fault protection for equipment, which has a totally different level of protection and a totally different intent. Because of the effects of current flow through the human body, ground-fault protection for personnel typically addresses current in the 4 to 6 milliampere range.
Ground-fault protection for equipment addresses electrical apparatus damage due to line-to-ground faults and looks at current several orders of magnitude higher. An assured equipment grounding conductor program AEGCP is a method of protection for personnel against ground-fault current flow through the body.Advantages and disadvantages of mass media ppt
The basic concept of the AEGCP is that conductive surfaces which may become energized due to line-to-ground faults and with which personnel may come in contact be properly grounded. Thus if properly grounded and a line-to-ground fault occurs, the low impedance path would allow resulting current flow to be large enough to be detected and removed by the circuit protective device.
This would then de-energize the conductive surface subject to contact by personnel, removing the shock hazard. Section of the NEC addresses the issue. Ground-Fault Protection for Personnel.
Ground-fault protection for personnel for all temporary wiring installations shall be provided to comply with a and b. This section shall apply only to temporary wiring installations used to supply temporary power to equipment used by personnel during construction, remodeling, maintenance, repair, or demolition of buildings, structures, equipment, or similar activities. All volt, single-phase, and ampere receptacle outlets that are not part of the permanent wiring of the building or structure and that are in use by personnel shall have ground-fault circuit interrupter protection for personnel.
If a receptacle s is installed or exists as part of the permanent wiring of the building or structure and is used for temporary electric power, ground-fault circuit-interrupter protection for personnel shall be provided.
For the purposes of this section, cord sets or devices incorporating listed ground-fault circuit interrupter protection for personnel identified for portable use shall be permitted. Exception No. Receptacles other than volt, single-phase, and ampere receptacles shall have protection in accordance with 1 or, the assured equipment grounding conductor program in accordance with 2.
The equipment grounding conductor shall be connected to its proper terminal. The employer shall use either ground-fault circuit interrupters as specified in paragraph b 1 ii of this section or an assured equipment grounding conductor program as specified in paragraph b 1 iii of this section to protect employees on construction sites.
These requirements are in addition to any other requirements for equipment grounding conductors. All volt, single-phase and ampere receptacle outlets on construction sites, which are not a part of the permanent wiring of the building or structure and which are in use by employees, shall have approved ground-fault circuit interrupters for personnel protection. Receptacles on a two-wire, single-phase portable or vehicle-mounted generator rated not more than 5kW, where the circuit conductors of the generator are insulated from the generator frame and all other grounded surfaces, need not be protected with ground-fault circuit interrupters.
The employer shall establish and implement an assured equipment grounding conductor program on construction sites covering all cord sets, receptacles which are not a part of the building or structure, and equipment connected by cord and plug which are available for use or used by employees. This program shall comply with the following minimum requirements:. Equipment found damaged or defective shall not be used until repaired.
This test record shall identify each receptacle, cord set, and cord- and plug-connected equipment that passed the test and shall indicate the last date it was tested or the interval for which it was tested. This record shall be kept by means of logs, color coding, or other effective means and shall be maintained until replaced by a more current record. The record shall be made available on the jobsite for inspection by the Assistant Secretary and any affected employee.
While the AEGCP is permitted, it is only valid if all requirements are continuously met which requires correct administration and strict enforcement.
GFCIs and Assured Grounding Program
Because of concerns largely with the lack of enforcement, an effort to remove the AEGCP was made during the revision cycle for the Code.
This effort was based on experiences that indicated personnel were not properly protected because of improper enforcement, primarily on construction sites. During those discussions, arguments were made that lack of enforcement was not the correct reason to remove this option and that other means of protection would also be ineffective if not properly enforced.
Proposal a, referencing Section aException No. The outcome for the NEC will be determined by the action of the panel during this code cycle. Finally, it is very important to point out that a false sense of security can be created through the use of ground-fault protection for personnel, regardless of the method used.
A clear understanding of the method used and the protection it affords personnel must exist. Since the AEGCP relies on current flow high enough to be detected and removed by the circuit protective device, it does not contribute to safety of personnel in a series contact situation.
Its effectiveness is also reduced in high impedance or partial ground fault situations.OSHA requires that employers shall use either ground-fault circuit interrupters or an assured equipment grounding conductor program to protect employees on construction sites. All volt, single-phase and ampere receptacle outlets on construction sites, which are not part of the permanent wiring of the building or structure and which are in use by employees, shall have approved ground-fault circuit interrupters for personnel protection.
Receptacles on a two-wire, single-phase portable or vehicle-mounted generator rated not more that 5kV, where the circuit conductors of the generator are insulated from the generator frame and all other grounded surfaces, need not be protected with ground-fault circuit interrupters. An assured equipment grounding conductor program shall comply with the following minimum requirements:.
A written description of the program, including the specific procedures adopted by the employer. The description and procedures shall be available at the jobsite for inspection and copying by OSHA and any affected employee. The employer shall designate one or more competent persons to implement the program.
Each cord setattachment cap, plug and receptacle of cord sets, and any equipment connected by cord and plug, except cord sets and receptacles which are fixed and not exposed to damage, shall be visually inspected before each day's use for external defects, such as deformed or missing pins or insulation damage, and for indications of possible internal damage. Equipment found damaged or defective shall not be used until repaired. The following tests shall be performed on all cord set, receptacles which are not a part of the permanent wiring of the building or structure, and cord-and plug-connected equipment required to be grounded.
All equipment grounding conductors shall be tested for continuity and shall be electrically continuous. Each receptacle and attachment cap or plug shall be tested for correct attachment of the equipment grounding conductor.
The equipment grounding conductor shall be connected to its proper terminal. The employer shall not make available or permit the use by employees of any equipment which has not met these four requirements. Tests performed as required in the preceding paragraph shall be recorded.Microsoft access database ip address management
This test record shall identify each receptacle, cord set, and cord- and plug-connected equipment that passed the test and shall indicate the last date it was tested or the interval for which it was tested.
This record shall be kept by means of logs, color coding, or other effective means and shall be maintained until replaced by a more current record. The record shall be made available on the jobsite for inspection by OSHA and any affected employee. One of the methods listed by OSHA as part of acceptable record keeping is to establish a color code for marking cord sets and cord- and plug-connected equipment.
The table below lists a color code that is in wide use by electricians and contractors. Colored plastic or vinyl electrical tape is placed on one or both ends of cords and cord- and plug-connected equipment to denote the month that the tests were performed.
The presentation and use of this material is not intended to be an interpretation of those regulations. Please refer to the Regulations for the full text and interpretation of the Regulations and Standards. Please let me hear from you. Send E-mail to Webmaster with questions or comments about this web site. Assured Grounding. Electrical Protection of Employees on Construction Sites OSHA requires that employers shall use either ground-fault circuit interrupters or an assured equipment grounding conductor program to protect employees on construction sites.
Ground-Fault Circuit Interrupters All volt, single-phase and ampere receptacle outlets on construction sites, which are not part of the permanent wiring of the building or structure and which are in use by employees, shall have approved ground-fault circuit interrupters for personnel protection. An assured equipment grounding conductor program shall comply with the following minimum requirements: A written description of the program, including the specific procedures adopted by the employer.Department of Labor Alexis M.
Jeffress, Assistant Secretary OSHA Revised This informational booklet is intended to provide a generic, non-exhaustive overview of a particular standards-related topic. This publication does not itself alter or determine compliance responsibilities, which are set forth in OSHA standards themselves and the Occupational Safety and Health Act. Moreover, because interpretations and enforcement policy may change over time, for additional guidance on OSHA compliance requirements, the reader should consult current administrative interpretations and decisions by the Occupational Safety and Health Review Commission and the Courts.
Material contained in this publication is in the public domain and may be reproduced, fully or partially, without permission of the Federal Government. Source credit is requested but not required. This information will be made available to sensory impaired individuals upon request.
What is a GFCI? With the wide use of portable tools on construction sites, the use of flexible cords often becomes necessary. Hazards are created when cords, cord connectors, receptacles, and cord- and plug-connected equipment are improperly used and maintained. Generally, flexible cords are more vulnerable to damage than is fixed wiring.
Flexible cords must be connected to devices and to fittings so as to prevent tension at joints and terminal screws.
A Review of the Assured Equipment Grounding Conductor Program
Because a cord is exposed, flexible and unsecured joints and terminals become more vulnerable. Flexible cord conductors are finely stranded for flexibility, but the strands of one conductor may loosen from under terminal screws and touch another conductor, especially if the cord is subjected to stress or strain.
A flexible cord may be damaged by activities on the job, by door or window edges, by staples or fastenings, by abrasion from adjacent materials, or simply by aging. If the electrical conductors become exposed, there is a danger of shocks, burns, or fire. A frequent hazard on construction site is a cord assembly with improperly connected terminals. Also, when a cord connector is wet, hazardous leakage can occur to the equipment grounding conductor and to humans who pick up that connector if they also provide a path to ground.
Such leakage is not limited to the face of the connector but also develops at any wet portion of it. When the leakage current of tools is below 1 ampere, and the grounding conductor has a low resistance, no shock should be perceived. However, should the resistance of the equipment grounding conductor increase, the current through the body also will increase.
Thus, if the resistance of the equipment grounding conductor is significantly greater than 1 ohm, tools with even small leakages become hazardous. These requirements will help reduce the number of injuries and accidents from electrical hazards. Work disruptions should be minor, and the necessary inspections and maintenance should require little time. This booklet is intended to help employers and employees responsible for electrical equipment provide protection against volt electrical hazards on the construction site—the most common being ground fault electrical shock—through the use of GFCIs or through the assured equipment grounding conductor program.
A GFCI is a fast-acting circuit breaker that senses small imbalances in the circuit caused by current leakage to ground and, in a fraction of a second, shuts off the electricity. The GFCI continually matches the amount of current going to an electrical device against the amount of current returning from the device along the electrical path.
See diagram. It protects against the most common form of electrical shock hazard—the ground fault, and protects against fires, overheating, and destruction of insulation on wiring. GFCIs can be used successfully to reduce electrical hazards on construction sites.
Tripping of GFCIs—interrupting current flow—is sometimes caused by wet connectors and tools. It is good practice to limit exposure of connectors and tools to excessive moisture by using watertight or sealable connectors.Don't worry, we'll come to you.
Published In December Over the past several Code cycles, increasing restrictions have been placed on the use of the assured equipment grounding conductor program AEGCP.Mwasiti kitoronto nataka jibu audio
This article reviews and discusses the development of the program in Articlea proposed restriction for the NEC, and how this proposal affects worker protection. There have been three significant changes. First, in the NEC, the section was revised to significantly expand the scope of the requirement beyond construction sites. As noted above, if temporary power is supplied from a, or ampere NECvolt receptacle outlet, GFCI protection is the only option.
Over the past several Code cycles, Code-Making Panel 3 CMP-3 has clarified that many forms of GFCI protection, including cord sets or devices incorporating listed ground-fault circuit interrupter protection for personnel identified for portable use, are permitted methods to provide the necessary protection. Finally, when the NEC expanded the scope of the section, an exception was added for industrial establishments.
This exception was revised in the NEC to clarify that it applies to all receptacle outlets. Industry strongly objected, a compromise was made, and the program survived, although its application was severely limited.
The equipment grounding conductor shall be connected to its proper terminal. Think about how complex and comprehensive this program would need to be on a multi-employer construction site with a dynamic workforce comprising of many sub-contractors.
And, even if these steps are fully implemented, the result is a level of protection inferior to that provided by GFCI. By using GFCI protection for their employees, they can provide a superior level of protection from electrical shock, and they can do so in a manner that is less costly than the AEGCP. The cycle is not yet complete, but if this panel proposal stands——as it well should——workers can be assured that wherever they work, in industrial, commercial, or residential establishments, they will be given the very best possible level of protection from electrical shock.
He can be reached at mic3 concentric. National Electrical Code. View the discussion thread. Sign up and Get Connected.An year-old worker at a construction site was electrocuted when he touched a light fixture while descending from a scaffold for his afternoon break.
The source of the electricity was apparently a short in a receptacle, but examination revealed that the electrical equipment used by the contractor was in such poor condition that it was impossible to make a certain determination of the source of the short.
Extension cords had poor splices, no grounds, and reversed polarity.
The Assured Equipment Grounding Conductor Program
One hand drill was not grounded, and the other had no safety plate. Out of several possible scenarios, the most likely was contact between the exposed wires of an extension cord and a screw that protruded from the receptacle, which had its face plate removed. The light fixture, which served as a ground, was known to be faulty for at least 5 months before the incident. Continued use of damaged electrical equipment power tools, extension cords, etc poses an extremely hazardous risk for workers:.
The above story is just one of many incidents workers have faced when working with electricity, many of which can be prevented. One such prevention is the use of an assured grounding program.
The assured grounding program consists of a written program, daily visual inspections and a method to detect a faulty grounding wire in an extension cord or hand tool. The objective is to prevent electrocution by ensuring the grounding wire is electrically continuous from the power tool to the power source.
An Assured Grounding Program contains four parts:. White only April. Green only July.Appen reviews reddit
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Use of assured grounding programs will keep workers safe from electricity hazards by using systematic testing of tools to ensure equipment poses no risks.
SafetyNow provides you with access to a large variety of training formats. April 17, What is an Assured Grounding Program?Purpose This guideline defines a "qualified electrical worker" and a "qualified worker" under Part 19 of the Regulation. For the purposes of Part 19 of the Regulationbased upon section 4 of the Electrical Safety Regulationan individual must not perform regulated work in respect of electrical equipment unless the individual meets at least one of the following criteria:.
Section 1. The determination of whether a worker is "qualified" depends upon the particular circumstances of the work to be performed and that worker's knowledge, skills, and abilities. An evaluation must be performed by the employer to determine whether the worker has sufficient knowledge, skills, and ability to safely perform that particular type of work.
If the Regulation reference is to a "qualified worker" and not to "qualified electrical worker" then the worker does not necessarily need to be a "qualified electrical worker," as defined in the previous portions of this guideline. A WorkSafeBC prevention officer, while performing an inspection, may assess whether an individual meets the requirements of a "qualified electrical worker," or a "qualified worker," as required by the Regulation.
Regulatory excerpt Section Purpose of this guideline The purpose of this guideline is to describe the authority acceptable to WorkSafeBC for certification of certified utility arborists.
Background Where tree pruning operations are conducted near energized conductors, certified utility arborists are permitted to work close to those conductors, up to the limits in Table of the Regulation.
In addition, the certified utility arborist is permitted to be in an aerial device passing between energized conductors in accordance with section Given the nature of the hazards encountered in these tasks, it is crucial that the certified utility arborist be provided with specific training that provides a comprehensive understanding of how to manage those hazards.
For this reason, the Regulation defined a certified utility arborist as a person who has instruction, and experience, and who has been certified by an authority acceptable to WorkSafeBC. Certification acceptable to WorkSafeBC The definition of certified utility arborist states that the certified utility arborist has completed a course of instruction and has a minimum of 1, hours of practical experience.
In addition, the certified utility arborist must be certified by an authority acceptable to WorkSafeBC.
A certified utility arborist must have completed the relevant Industry Training Authority "ITA" approved training program. That program involves classroom training, delivered through public post-secondary institutions, private training institutions, and secondary schools that have been approved by the ITA. The program also involves a minimum number of hours of work experience. Other certificates WorkSafeBC recognizes that other training courses may be developed that may meet the requirements for acceptance under section Any new courses WorkSafeBC identifies as acceptable under section Persons wishing to have WorkSafeBC consider an alternative course for acceptance under section Purpose of guideline The purpose of this guideline is to clarify the application of section Interpretation This section of the Regulation is intended to keep wooden utility poles clear of obstructions to ensure a safe climbing area for workers.
It does not apply to poles which are not climbed by workers.Automatic sms verification with the sms retriever api
The owner of a pole may also have restrictions and requirements and should be contacted before placing any object on or close to a pole. Purpose of guideline This guideline lists acceptable alternative standards for electrical testing equipment.
Acceptable standards In addition to the standards specified in section This guideline has been retired as the Standards it accepted are no longer used by industry for the certification of insulated aerial devices. Purpose of guideline The purpose of this guideline is to reference the additional requirements under section
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