Student manual centers for disease control and prevention. Depending on your type of electric service and how the service is used, additional steps may be warranted to ensure that your equipment is properly protected. A presentation on the basics of electrical safety, including terminology, an introduction to fundamentals of electricity, and ways to prevent electrocution. Have a qualified electrician inspect electrical equipment that has gotten wet before energizing it. With all electrical equipment operations, there is the threat of shock andor electrocution. These electrical shocks or accidents not only cause severe injuries or death to people, but also damage the property and installations. That page does not exists or is now living at a different address. Electrical equipment in outdoor applications power box enclosures are custom designed for pole, pad or wall mount applications and provide maximum protection for your specified equipment. Has been trained to avoid electrical hazards when working on or near exposed energized parts. Electrical arc flash hazard protection standard the electrical arc flash hazard protection electrical arc flash hazard protection standard is in place to guide electrical managers and workers in working around potential electrical arc flash hazards. Each organisational unit is required to assess electrical risks at the workplace. In general, electrical power system rooms shall not have any water pipes, ducts, or other foreign systems except those required for ventilation and drai nage or fire protection of the rooms. Metallic parts of electrical equipment that can be exposed to voltage due to insulation failures are usually connected to earth potential, that is, earthed. Electrical safety electrical work can be deadly if not done safely.
Electrocution is the cause of 7% of all workplace deaths among young workers aged 1619, causing an average of 10 deaths per year. Ex i intrinsic safety the traditional electronic explosion protection. Calosha regulations on electrical safety require california employers to provide workers with a safe and healthful workplace. Personal protective equipment occupational safety and. Electrical burns most common shockrelated, nonfatal injury occurs when you touch electrical wiring or equipment that is improperly used or maintained typically occurs on the hands very serious injury that needs immediate attention. Electrical safety power system protection practice. The second feature discusses the use of electrical equipment in hazardous locations, which should. Electrical performance of spd is based on the specific system indicated. You will not be qualified to work on electrical equipment. Occupational safety and health administration osha 315112r. Consider all floors as conductive unless covered with insulating matting of suitable type for electrical work. Mount on cardboard procedure discuss the following information with the students.
The supply to the electrical equipment is fed through a safety barrier that limits the current and voltage so that the minimum ignition energy and ignition temperature of an explosive mixture are. Threephase service ouc delivers singlephase or threephase service to customers depending on their specific power requirements. Salmas, member, ieee, and andreas koulaxouzidis abstractindustrial facilities are becoming more and more dependent on computer control of their processes, and as a con. The objective of a protection scheme is to keep the power system stable by isolating only the components that are under. Protection of electrical and electronic parts, assemblies and equipment excluding electrically initiated explosive devices electrostatic discharge association 7900 turin road, bldg. When working inside the limited approach boundary, workers must select and use work practices, including insulated tools that provide maximum protection from a release of energy. Pdf powersystem protection device with iotbased support for. Electrical protection devices will generally fall into two categories, those designed for consumer use within the home and those designed for industrial use to protect todays complex and sensitive electronic equipment worth millions of dollars. Where can i find the calosha regulations for electrical safety.
These regulations are contained in title 8 of the california code of regulations t8ccr. Safety practices and requirements electrical arc flash. This is done so that the current in a circuit will follow its intended path. Protecting electronic equipment from high voltage spikes and emi noise most electronic equipment and switchmode power supplies include emi electromagnetic interference protection circuits that are designed to protect the equipment from externally generated electrical interference including high voltage spikestransients. Electrical faults l phase to phase l phase to ground.
Abb protection, control and electrical devices 9 1 standards low voltage directive 200695ce the low voltage directive refers to any electrical equipment designed for use at a rated voltage from 50 to v for alternating current and from 75 to 1500 v for direct current. Stray electric currents, cathodic corrosion protection. The national electrical safety code is a referenced standard to osha 29 cfr 1910. The nesc contains the basic provisions that are considered necessary for the. Never repair electrical cords or equipment unless qualified and authorized. Therefore, electrical safety is the necessary key to reduce such accidents caused by the electricity. Protecting sensitive electronic equipment page 1 introduction personal computers, servers, microprocessorbased controllers, telephone switchboards, robotics, cash registers systems the list goes on. The training room is a clean clothes area only, enclosed footwear at all times. These values have been established through short circuit testing of that equipment according to an accepted industry standard. Electrical safety in the workplace 2 course goal the aim of this program is to provide comprehensive onsite training to high risk workers i. This is a part of risk assessment method it has been introduced to enable an alternate approach to current methods of selecting ex equipments. Do not overload electrical equipment by attempting to do heavier jobs than the equipment can handle. Sep 16, 20 equipment protection level equipment protection level epl its a concept.
All of these are electronic equipment types named in loss reports where the cause of the damage was a voltage surge. The ahj should, through experience or education, be knowledgeable of the requirements contained in the osha standards, the national electrical code, the national electrical safety code, doe requirements, and other appropriate local, state, and national standards. Ueeneeg063a arrange circuits, control and protection for. The current method of selection of equipment is based upon the classification of hazardous area into zones ref. Electrical fires are frequently caused by overloaded equipment and circuits. The following safe work practices can prevent electrical shock.
Protective devices for electrical control equipment. While the electrical technician went to get the equipment service manual, the service representative opened the panel cover of. The high level of protection offered by residual current devices is well documented. Electrical safety tips protection against electrical hazards. Powersystem protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults through the disconnection of faulted parts from the rest of the electrical network. Decoding the nec to prevent shock and electrocution. First published in 1897, the national electrical code has been adopted in all 50 states as the standard for safe electrical installation, inspection, and use to protect people and property from avoidable electrical hazards. Introduction an electrical unit is built with great care to ensure that each separate electrical circuit is fully insulated from all the others. The electrical safety guide for non electrical workers document does not replace any relevant regulations or codes for which the university must comply with nor does it authorize university, faculty, staff and students to perform electrical work for which they are not trained or qualified to perform. Purpose of protection system l minimize damage l leave unaffected equipment inservice l maintain equipment operating limits l maintain electrical system stability. Sgs owns and utilises some of the most advanced and accurate test equipment available.
This can cause insulation to burn, create sparks and leave exposed wires. Pdf highlow voltage protection device system for appliances. A protection b protection action q breaker x breaker y device z initiate trip close initiate trip close pt ct 2 ct 1 electrical bus electrical system protection logic protection. Sizing conductors and selecting protection devices legrand. Protective devices for electrical control equipment fuses, circuit breakers, chop off circuits, crowbars, thermostats arthur holland, holland technical skills in previous columns i have dealt with protection of the process and the product. Installing seismic restraints for electrical equipment january 2004 developed by the vibration isolation and seismic control manufacturers association under a cooperative agreement between the federal emergency management agency and the american society of civil engineers federal emergency management agency fema 4january 2004. If contact with the exposed live part is likely, the worker must only use insulated tools. Protecting electronic equipment from high voltage spikes and. These procedures make sure that electrical equipment is deenergized before it is repaired and protect workers against electric shock. The electrical safety guide for nonelectrical workers document does not replace any relevant regulations or codes for which the university must comply with nor does it authorize university, faculty, staff and students to perform electrical work. Course not designed to teach you to work on electrical equipment. Rcds are now mandatory in every new home and, in time, this legislation will extend to most workplaces.
Manager and works must comply with the electrical arc flash hazard protection standard. Equipment protection level expert electrical technologies. Definitions of terms relation to electrical protective equipment f819 temporary grounding systems to be used on deenergized electric power lines and equipment f855 test method for determining dielectric strength of overshoe footwear f1116 dielectric overshoe footwear f1117 guide for visual inspection of electrical protective rubber. Protection of electrical and electronic parts, assemblies. Dont blame the cow one dark night, when people were in bed. Electrical equipment inspection, testing and tagging. If working in damp locations, inspect electric cords and equipment to ensure that they are in good condition and free of defects, and use a ground. Here we turn to protection of wiring, control panel components and various plant items. Most electrical equipment has a withstand rating that is defined in terms of an rms symmetricalshortcircuit current, and in some cases, peak letthrough current. Estimates show that 10 arcflash incidents occur every day in the us. Protecting electronic equipment from high voltage spikes. Over 2000 workers are sent to burn centers each year with severe arcflash burns.
This is done to protect the equipment against excessive overvoltages and to limit the damage to material and property and especially the hazard to the public. See the magnifying glass at the top right of the page. Electrical equipment inspection, testing and tagging procedure. This student manual is part of a safety and health curriculum for secondary and postsecondary electrical trades courses. Protection of electronic equipment from electrical phenomena.
The course is conducted by a qualified trainer and is held at our facilities or yours. Pdf this paper proposes a powersystem protection device designed to be integrated. Protection devices must be provided to limit and break the shortcircuit currents before their thermal. However, overload protection is required for lowvoltage equipment. A30yearold male electrical technician was helping a company service representative test the voltageregulating unit on a new rolling mill. One who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved. Operating in undervoltage conditions can drastically reduce the life of the electromechanical equipment and lead to premature failure. This could happen when electrical equipment is not working correctly, causing current leakage known as a ground fault.
Electrical workers are potentially exposed to a variety of hazards such as electric shock the. Electrical faults l phase to phase l phase to ground l phase to phase to phase l phase to phase to phase to ground. Protecting electronic equipment can be very important to protect investments in televisions, computers and many other expensive items. Features and benefits manufactured using proprietary natural rubber process in our iso 900102 and iso 14001 world class manufacturing facility. Ueeneeg063a arrange circuits, control and protection for general electrical installationsdate this document was generated. L minimizes the amount of equipment removed from service in event of a failure. Fuses are single phase protective devices that combine. Please try the a to z directory here or use the search tool.
Electrical workers safety handbook 5 c o n t e n t s tools 29 hand tools 30 electric hand tools 32 poweractuated tools motor vehiclesmechanized equipment 33 overview 34 cranes, hoists, elevators, and conveyors 35 aerial lifts special work situations 36 confined spaces 37 excavations and trenching 38 gas cylinders 39 hot work policy. Electric power generation, transmission and distribution standards must assess the worksite where fall protection is needed to protect workers. Electrical safety michigan water environment association. Basic electrical safety practices the institute requires everyone who uses electrical equipment to understand these safety precautions to comply with the osha electrical safetyrelated work practices standard and mits electrical safety policies. To meet osha regulations, leather protector gloves must be worn over this product. Naturally, the levels of protection necessary for these two classes of equipment are vastly different. Risk watch electrical safety lesson plans objectives 1. The objective of a protection scheme is to keep the power system stable by isolating only the components that are under fault, whilst leaving as much of the network as. Presentation on substation protection devices presented by. How to protect electronic equipment with surge protectors. Undervoltage occurs when the average voltage of a threephase power system drops below intended levels, and is sometimes referred to as a brownout. Protection of electronic equipment from electrical phenomena the computer file server or the main computer that supplies data to each of the pcs in a network, may require constant power supervision, depending on its functions introduction various electrical phenomena, such as sags, blackouts, spikes, surges, and electrical. Do not handle electrical equipment when hands, feet or body are wet or perspiring, or when standing on a wet floor. Electric power generation, transmission and distribution.