The power system should be designed and managed to deliver this energy to the utilization points with both reliability and economically. Keeping electrical switchgear safe health and safety. Electrical switchgear and safety by health and safety executive hse, 9780717665778, available at book depository with free delivery worldwide. The electrical installation handbook is a tool which is suitable for all those who are interested in electrical plants. You can buy the book at uk and most good bookshops. The safest way to conduct electrical work is to shut off electric power and work on deenergized equipment.
Switchgear and circuit breakers failures and case studies. Electrical safety in the workplace 2 course goal the aim of this program is to provide comprehensive onsite training to highrisk workers i. Department of labor occupational safety and health. Assembly of such devices in a logical manner forms switchgear. This guidance is aimed at owners and operators of electrical switchgear in industrial and commercial organisations. The switches, fuses, circuit breaker, isolator, relays, current and potential transformer, indicating instrument, lightning arresters and control panels are examples of the switchgear devices. Arc resistance protects the operator from harm and limits damage to equipment in the case of an internal arc fault. Switchgear and protective devices 2015 3 p a g e syllabus switchgear and protective devices 310 modulei 10 hours protective devices.
The checklists are intended to help inspectors keep track of the numerous aspects of an electrical installation. The modular unit can be commissioned on site in a matter of days, providing a complete data centre power distribution system in an efficient manner. Follow all precautions specified by the manufacturer. Safety switches and circuit breakers safety switches are often confused with circuit breakers and fuses, but they perform very different tasks. Safe operation and maintenance of circuit breakers and. Over 3 decades, the safety electrical group seg has served and partnered with some of the most prestigious clients across the region with one simple motto. To perform work on this type of equipment, one must be trained and experienced in. Safety operations on medium voltage switchgear photo credit. General industry electrical hazards including arc flash. In principle, all circuits of an lv installation shall have means. Health and safety executive keeping electrical switchgear safe this is a freetodownload, webfriendly version of hsg230 first edition, published 2002.
Conductors substances, such as metals, that have little resistance to electricity. Vuspec page 3 ieee 12402000 r2012, ieee guide for the evaluation of the reliability of hvdc converter stations ieee 12462011, ieee guide for temporary protective grounding systems used in substations. Our mill duty safety switches are designed specifically for rugged conditions found in steel mills, cement foundries and processrelated environments. Modern developments are, however, significantly reducing these hazards, helping to make mv switchgear safer while also enhancing its reliability. When you fail to conduct the proper maintenance, the risk of loss.
Practical electrical substation safety for engineers. It is therefore, important to remember that an interlock or safety feature should never be bypassed of defeated. Ms28 handbook maintenance of electrical switchgear tl4. This square d product catalog provides selection information for general duty safety switches, heavy duty safety switches, and double throw safety switches. Here you can find protection and switchgear by bakshi free download shared files. As the technical authors of the health and safety executive publication hsg 230 keeping electrical switchgear safe, ea technology are uniquely placed to explain all you need to know to manage your switchgear assets safely, in this concise yet comprehensive oneday conference. In general, switchgear has a proven record of reliability and performance. Protection and switchgear by bakshi faadooengineers. It will help managers, engineers and others to understand their responsibilities and duties in the selection, use, operation and maintenance of highvoltage switchgear. Design safety standards for electrical systems, and 1910. Switchgear interlocks and safety features introduction interlocks and safety features on switchgear are for the purpose of protecting both operating personnel and the equipment from physical harm. The challenge to save energy, improve safety or make sure everything continues to perform. In other words systems used for switching, controlling and protecting the electrical.
Operate and maintain equipment solutions l001ac 55 medium voltage low voltage transformer substations k003ac 56 ws gas insulated switchgear up to 36 kv m001tc 57 wi gas insulated switchgear up to 52 kv m002tc 58 gma gas insulated switchgear up to 24 kv. The apparatus used for controlling, regulating and switching on or off the electrical circuit in the electrical power system is known as switchgear. Their correct installation, operation and maintenance can save thousands of dollars. Inspect the switch before operating it for any signs of degradation, such. Nfpa delivers free online access to all nfpa standards to enhance public safety and to serve the publics increasing interest in technical information. Health and safety executive electrical switchgear safety a guide for owners and users this is a webfriendly version of leaflet indg372rev1, published 04 introduction this guidance is for owners and operators of electrical switchgear in industrial and commercial organisations with little electrical knowledge or expertise available inhouse. Molded case circuit breaker systems testing with conductors. Electrical safety summary 53 annex a 54 electrical safety terms and definitions 54 annex b 61 electrical safety codes and standards 61 annex c 63 energized electrical work permit 63 annex d 65 arcflash calculation steps 65 annex e 67 arc flash calculator tables 67 annex f 71 resources for electrical safety 71 annex g 73 references 73 annex h 74. Ensure industryleading support for tailored design and delivery of electrical switchgear safety and operation with our expert advice. A block is connected to switchgear power bus and to output cables by terminal clamps. This type of equipment is directly linked to the reliability of the electricity supply. Safety switches monitor the flow of electricity through a circuit. Eaton s heavy duty safety switches can be applied as service entrance and branch circuit protection, motor disconnects, and lockout, tagout loto devices. This circuit breaker uses both sf 6 and air as insulation.
Guide to osha and nfpa 70e safety requirements when servicing and maintaining mediumvoltage switchgear, circuit breakers, and mediumvoltage controllers rated above v. Benefits are derived from well implemented solutions. Safety switch electrical disconnect knife blade exo. Electrical protection the aim is to avoid or to limit the destructive or dangerous consequences of excessive shortcircuit currents, or those due to overloading and insulation failure.
Nfpa 70e helps companies and employees avoid workplace injuries and fatalities due to shock, electrocution, arc flash, and arc blast, and assists in complying with osha 1910 subpart s and osha 1926 subpart k. This handbook contains information on safety practices and environmental considerations when working on switchgear, descriptions of typical classes of switchgear, and preventive and corrective maintenance guidelines for switchgear. We offer a medium voltage switchgear training course because medium voltage switchboards play a big role in the distribution of power and management of distribution systems. The switchgear then becomes overstressed during fault conditions and the risk of failure is increased. Switchgear maintenance is usually considered a low priority by most management teams, who defer or ignore it until a failure occurs. Also, information is presented to assist local postal service personnel in. How to download switchgear protection and power systems by. Medium voltage switchgear training course length is customizable based on your needs. A switchgear is a generic term which includes all the switching devices associated with power system protection. Oshas electrical standards are based on the national fire protection association standards nfpa 70, national electric code, and nfpa 70e, electrical safety requirements for employee workplaces. This course provides introductory information about electrical safety when working with power distribution switchgear and substations.
Philosophy of protection, nature, causes and consequences of faults, zone of protection, requirements of a protective scheme, basic terminology components of protection scheme. Safe operation and maintenance of circuit breakers and switchgear. This paper covers general safe operations on medium voltage equipment and. Switchgear is used both to deenergize equipment to allow work to be done and to clear faults downstream. We support you in developing safety rule schemes tailored. Although iec standards for hv products focus primarily on electrical safety, they do not explicitly link the requirements to the hazards of a product. Most of the electrical health and safety regulations can be found in t8ccr, chapter.
The advice contained in the leaflet will help you to keep your electrical switchgear safe and comply with the health and safety at work etc act 1974, the management of health and safety at work regulations 1999 and the electricity at work regulations 1989. Safety switches can prevent a serious electric shock, but they are not a substitute for proper electrical maintenance and safe practices. Safety operations on medium voltage switchgear it is important when operating on medium voltage equipment that we follow the safety rules and operating regulations in order to be safe. The switchgear must be deenergized and grounded prior to conducting any maintenance, sf. Insulators substances, such as dry wood, rubber, glass and bakelite, that have high. As seg has grown into a full service electrical company with thousands of satisfied clients across the mena region, this motto remains essential to how. It also includes all devices associated with control, metering and regulating of electrical power systems. Call the electric utility company to report fallen. About course author paul guyer is a registered mechanical engineer, civil engineer, fire protection engineer and architect with over 35 years experience in the design of buildings and related infrastructure. All the design features of advance are included in safegear, making this the most advanced switchgear product, with the best protection available today. Most importantly all measuring tools must have valid calibration certificate at the time of switchgear testing and commissioning of switchgear.
Safety compliance checklist electrical utilities general 29 cfr 1910 y are workers wearing proper protective equipment ppe, such as gloves and sleeves. Spec setter double throw type tc and tdt doublethrow safety switches are designed for applications with two sources of power where safety, high performance and continuity of service are essential. Overview electrical energy systems types of protection 2. All ge heavy duty safety switches carry the following certifications. Nfpa 70e, standard for electrical safety in the workplace. A block is connected to switchgear power bus with connectors and to output cables with a dismountable plugsocket connection with a socket installed on a block. Electrical switchgear and safety thorne and derrick uk. Safegearmetalclad switchgear is a newly designed arcresistant switchgear. This version has been adapted for online use from hses current printed version. Setting the benchmark in operational safety, reliability and quality the innovative mns is mns is condition monitoring introduction and brief history in january 2009, a new standard was introduced by the international electrotechnical commission iec, which governs the safety and performance of electrical switchgear and controlgear assemblies.
In an electric power system, switchgear is composed of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment. All workers to comply the safety requirements such as safety shoes, safety helmet, safety glasses, fluorescent vest, and safety gloves to ensure maximum ability of safe work. Failures are rare but, where they occur, the results may be catastrophic. All ge heavy duty safety switches are ul listed and csa certified ul98 enclosed switches csac22. Electrical safety new mexico public regulation commission. Ges heavy duty safety switches are ul listed as service entrance equipment when installed in accordance with the national electrical code. For the purposes of this discussion, a substation refers to substations and switching stations. This paper covers general safe operations on medium voltage equipment and looks at the aspects. Safety net llc was established in 2004 is sister concern of ms. Y is protective grounding equipment provided and capable of carrying the maximum fault current that could flow at the point of grounding for the time necessary to clear the fault269n34. This online engineering pdh course provides an introduction to electrical safety when working around electric power distribution substations and switchgear.
Switchgear and protective devices 2015 6 p a g e 1. In other words systems used for switching, controlling and. Switchgear maintenance suggestions rev 1 ge industrial. Fully assembled switchgear, ups systems and pdu electrical schemes are engineered, built and tested in our controlled manufacturing facilities, ready to be installed on site as a complete unit. However, a rising issue is, whether standards for hv switchgear and controlgear really cover hazards comprehensively.
Because of the high energy levels and high voltages involved, there will always be potential hazards involved in working with medium voltage mv switchgear. Practical high voltage safety operating procedures for engineers and technicians practical electrical wiring standards national rules for electrical installations et 101. These regulations are contained in title 8 of the california code of regulations t8ccr. Mv network switchgear, protection and control ravinder negi manager, services execution india. A section of a large switchgear panel, in this case, used to control onboard casino boat power generation. New iec standard series for lowvoltage switchgear and. Electrical safety training for the manufacturing industry. Kit electrical interlock switch show more characteristics.
Electrical installation handbook protection, control and. Never assume that a wire is safe to touch even if it is down or appears to be insulated. Switches rated 8001200 amps use class l fuses and have a ul listed short circuit rating of 100,000 rms symmetrical amps. At many facilities, the maintenance crews take only some of the easier steps. Download protection and switchgear by u a bakshi and m v bakshi pdf. C has an independent work shop and store and office at al qusais industrial area. This pdf contains 77 electrical inspection checklists taken from the 2014 electrical inspection manual with checklists. Why lockout, tagout is vitally important by panduit duration. Home electrical safety checklist keeping you and your family safe, roombyroom u. Grantee materials by topic occupational safety and. Electrical safety electrical hazards can cause burns, shocks and electrocution death. Safety labels for padmounted switchgear and transformers sited in public areas. A flagship family of eaton s broad array of electrical disconnects, heavy duty safety switches are fully customizable through the switching device flex center.
However, experience shows this is an economic dance with the devil. Safety operations on medium voltage switchgear author and presenter. Fm global switchgear and circuit breakers failures and case studies ue systems 2015 reliable asset conference june 4th dan crawford, group manager field engineering, fm global. Georgia department of administrative services 3 current the movement of electrical charge. At csuci our intent and standard practice will be to avoid energized electrical. Assume that all overhead wires are energized at deadly voltages. The checklists are in pdf format and can be completed electronically or printed and used as hard copy. Calosha regulations on electrical safety require california employers to provide workers with a safe and healthful workplace. Medium voltage switchgear training course lp management. Keeping electrical switchgear safe our solutions safety rule schemes are essential to ensure that legally compliant and safe working practices are followed. Includes information on safety switch enclosures, configurations, construction standards, safety switch ratings, and dimension drawings.
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