This version has been adapted for online use from hses current printed version. 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. Also, information is presented to assist local postal service personnel in. Department of labor occupational safety and health. Benefits are derived from well implemented solutions. Insulators substances, such as dry wood, rubber, glass and bakelite, that have high. Ges heavy duty safety switches are ul listed as service entrance equipment when installed in accordance with the national electrical code. Safety switches can prevent a serious electric shock, but they are not a substitute for proper electrical maintenance and safe practices. Electrical installation handbook protection, control and.
Protection and switchgear by bakshi faadooengineers. 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. 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. Electrical switchgear and safety by health and safety executive hse, 9780717665778, available at book depository with free delivery worldwide. A switchgear is a generic term which includes all the switching devices associated with power system protection. Electrical safety new mexico public regulation commission. In other words systems used for switching, controlling and protecting the electrical. 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. In an electric power system, switchgear is composed of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment. Practical electrical substation safety for engineers. Assume that all overhead wires are energized at deadly voltages. Practical high voltage safety operating procedures for engineers and technicians practical electrical wiring standards national rules for electrical installations et 101. The checklists are intended to help inspectors keep track of the numerous aspects of an electrical installation.
Safe operation and maintenance of circuit breakers and switchgear. Safety labels for padmounted switchgear and transformers sited in public areas. 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. Our mill duty safety switches are designed specifically for rugged conditions found in steel mills, cement foundries and processrelated environments. The apparatus used for controlling, regulating and switching on or off the electrical circuit in the electrical power system is known as switchgear. At csuci our intent and standard practice will be to avoid energized electrical. However, a rising issue is, whether standards for hv switchgear and controlgear really cover hazards comprehensively. 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. The challenge to save energy, improve safety or make sure everything continues to perform. In principle, all circuits of an lv installation shall have means. Includes information on safety switch enclosures, configurations, construction standards, safety switch ratings, and dimension drawings. This paper covers general safe operations on medium voltage equipment and looks at the aspects. 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.
Safety operations on medium voltage switchgear photo credit. Keeping electrical switchgear safe our solutions safety rule schemes are essential to ensure that legally compliant and safe working practices are followed. 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. Their correct installation, operation and maintenance can save thousands of dollars. It is therefore, important to remember that an interlock or safety feature should never be bypassed of defeated. Electrical safety electrical hazards can cause burns, shocks and electrocution death. 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. 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. Safety switches monitor the flow of electricity through a circuit.
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. However, experience shows this is an economic dance with the devil. We support you in developing safety rule schemes tailored. This paper covers general safe operations on medium voltage equipment and. 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.
Switchgear and protective devices 2015 3 p a g e syllabus switchgear and protective devices 310 modulei 10 hours protective devices. Grantee materials by topic occupational safety and. The switches, fuses, circuit breaker, isolator, relays, current and potential transformer, indicating instrument, lightning arresters and control panels are examples of the switchgear devices. 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. General industry electrical hazards including arc flash. At many facilities, the maintenance crews take only some of the easier steps. A section of a large switchgear panel, in this case, used to control onboard casino boat power generation. 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.
Ensure industryleading support for tailored design and delivery of electrical switchgear safety and operation with our expert advice. Because of the high energy levels and high voltages involved, there will always be potential hazards involved in working with medium voltage mv switchgear. Nfpa 70e, standard for electrical safety in the workplace. Failures are rare but, where they occur, the results may be catastrophic. Electrical safety in the workplace 2 course goal the aim of this program is to provide comprehensive onsite training to highrisk workers i. Switchgear maintenance is usually considered a low priority by most management teams, who defer or ignore it until a failure occurs. New iec standard series for lowvoltage switchgear and. Safety net llc was established in 2004 is sister concern of ms. Conductors substances, such as metals, that have little resistance to electricity.
Medium voltage switchgear training course length is customizable based on your needs. The checklists are in pdf format and can be completed electronically or printed and used as hard copy. Although iec standards for hv products focus primarily on electrical safety, they do not explicitly link the requirements to the hazards of a product. These regulations are contained in title 8 of the california code of regulations t8ccr. Safety switch electrical disconnect knife blade exo. Mv network switchgear, protection and control ravinder negi manager, services execution india. Download protection and switchgear by u a bakshi and m v bakshi pdf. Call the electric utility company to report fallen. The power system should be designed and managed to deliver this energy to the utilization points with both reliability and economically. Design safety standards for electrical systems, and 1910.
It will help managers, engineers and others to understand their responsibilities and duties in the selection, use, operation and maintenance of highvoltage switchgear. This pdf contains 77 electrical inspection checklists taken from the 2014 electrical inspection manual with checklists. The safest way to conduct electrical work is to shut off electric power and work on deenergized equipment. 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. Follow all precautions specified by the manufacturer. 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. Arc resistance protects the operator from harm and limits damage to equipment in the case of an internal arc fault. In other words systems used for switching, controlling and. Switchgear and circuit breakers failures and case studies.
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. Electrical safety training for the manufacturing industry. When you fail to conduct the proper maintenance, the risk of loss. Most importantly all measuring tools must have valid calibration certificate at the time of switchgear testing and commissioning of switchgear. Ms28 handbook maintenance of electrical switchgear tl4. This online engineering pdh course provides an introduction to electrical safety when working around electric power distribution substations and switchgear.
Safegearmetalclad switchgear is a newly designed arcresistant switchgear. Switchgear and protective devices 2015 6 p a g e 1. 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. Health and safety executive keeping electrical switchgear safe this is a freetodownload, webfriendly version of hsg230 first edition, published 2002. 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. Nfpa delivers free online access to all nfpa standards to enhance public safety and to serve the publics increasing interest in technical information. C has an independent work shop and store and office at al qusais industrial area. Never assume that a wire is safe to touch even if it is down or appears to be insulated. 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. A block is connected to switchgear power bus and to output cables by terminal clamps. This circuit breaker uses both sf 6 and air as insulation. Why lockout, tagout is vitally important by panduit duration. Philosophy of protection, nature, causes and consequences of faults, zone of protection, requirements of a protective scheme, basic terminology components of protection scheme. Medium voltage switchgear training course lp management.
Overview electrical energy systems types of protection 2. For the purposes of this discussion, a substation refers to substations and switching stations. Here you can find protection and switchgear by bakshi free download shared files. Assembly of such devices in a logical manner forms switchgear. Switches rated 8001200 amps use class l fuses and have a ul listed short circuit rating of 100,000 rms symmetrical amps.
This square d product catalog provides selection information for general duty safety switches, heavy duty safety switches, and double throw safety switches. The switchgear must be deenergized and grounded prior to conducting any maintenance, sf. Switchgear maintenance suggestions rev 1 ge industrial. Safety operations on medium voltage switchgear author and presenter. Switchgear is used both to deenergize equipment to allow work to be done and to clear faults downstream. All ge heavy duty safety switches carry the following certifications. 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. Eaton s heavy duty safety switches can be applied as service entrance and branch circuit protection, motor disconnects, and lockout, tagout loto devices. 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. Georgia department of administrative services 3 current the movement of electrical charge.
Inspect the switch before operating it for any signs of degradation, such. This guidance is aimed at owners and operators of electrical switchgear in industrial and commercial organisations. Keeping electrical switchgear safe health and safety. Kit electrical interlock switch show more characteristics. All ge heavy duty safety switches are ul listed and csa certified ul98 enclosed switches csac22. You can buy the book at uk and most good bookshops. Safety compliance checklist electrical utilities general 29 cfr 1910 y are workers wearing proper protective equipment ppe, such as gloves and sleeves. Molded case circuit breaker systems testing with conductors. The electrical installation handbook is a tool which is suitable for all those who are interested in electrical plants. This course provides introductory information about electrical safety when working with power distribution switchgear and substations. To perform work on this type of equipment, one must be trained and experienced in. The switchgear then becomes overstressed during fault conditions and the risk of failure is increased. It also includes all devices associated with control, metering and regulating of electrical power systems.
Modern developments are, however, significantly reducing these hazards, helping to make mv switchgear safer while also enhancing its reliability. In general, switchgear has a proven record of reliability and performance. Home electrical safety checklist keeping you and your family safe, roombyroom u. Calosha regulations on electrical safety require california employers to provide workers with a safe and healthful workplace.
Safe operation and maintenance of circuit breakers and. Most of the electrical health and safety regulations can be found in t8ccr, chapter. 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. Safety switches and circuit breakers safety switches are often confused with circuit breakers and fuses, but they perform very different tasks. Electrical switchgear and safety thorne and derrick uk. A flagship family of eaton s broad array of electrical disconnects, heavy duty safety switches are fully customizable through the switching device flex center.
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