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Product Safety Engineering Society The Product Safety Engineering (PSE) Society targets Long Island design professionals and design engineers interested in electrical product safety. The Society addresses safety engineering for equipment and devices used in the scientific, engineering, industrial, commercial and residential arenas. It allows engineers and other technical professionals an opportunity to discuss and disseminate technical information, to enhance professional skills, and to provide outreach to engineers, students and others with an interest in the field.
For upcoming PSE lectures and meetings, please visit the
calendar page. |
LI Test Labs Organizations > Electrical Safety Foundation > International Electrical Testing > NARTE > OSHA Reference & Publications > Safety in Power Supply Design Standards & Agencies > AAMI > ANSI > ASTM > CSA > FCC > FDA > ICNIRP > IEC > IEEE > ISO > NEMA > NFPA > NIST > TUV SUD > UL > WHO |
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Past Lectures |
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Electronic devices are ubiquitous in our society and since these devices do not work unless they are powered, all of them have to run from some source of electricity. Additionally, the electronic devices have to be designed, manufactured, and tested using appropriate AC and DC power supplies for their source of power. The energy available from the output of many power supplies can be detrimental to the user, to the device under test (DUT), and even to the power supply itself. Therefore, to maintain safety, it is essential for test and measurement equipment manufacturers to take these dangers into consideration when designing their power supplies and creating feature sets for these supplies.
Modern technology means that people are exposed to electromagnetic fields almost everywhere from a variety of sources. While the field strength is typically low in large distance from the source, in close proximity the induced fields and absorbed power may be high enough to harm the body. High-frequency electromagnetic fields, such as from broadcasting systems, mobile communication, wi-fi and radar, can all potentially pose radiation hazard (RadHaz) problems, as can low-frequency magnetic fields generated by high currents in applications such as welding guns, trains and electric vehicles. Various standards exist to regulate device design and installation of antennas and high-power components to avoid RadHaz. As measurement is typically not an option inside the human body, EM simulation is the often only way to analyze the complex field distribution and estimate the resulting hazards in order to ensure a product complies with statutory exposure limits.
Inductively coupled plasma atomic emission spectroscopy (ICP-AES) is a technique used for the detection of trace metals. This emission spectroscopy type uses the inductively coupled plasma to produce excited atoms and ions that emit electromagnetic radiation at wavelengths characteristic of a particular element, while the emission intensity indicates the concentration of the element within the sample under evaluation. This lecture reviewed ICP-AES theory and practical implimentations including trade-offs between Charge Injection Device (CID) and Charge Coupled Device (CCD) sensors. Practical application examples are also covered including product and food safety, as well as environmental uses.
The four primary electrical protection methods are explosion proof, intrinsic safety, purging, and non-incendive. Guidelines for the use of each of these protection methods are reviewed in addition to typical applications found in hazardous locations. Factors driving solutions and optimizing solutions for a given applications are outlined. Finally, the strengths and weaknesses to be considered when designing, installing, or maintaining each system type are summarized.
Medical device manufacturers are required to conduct risk management in accordance with ISO 14971 and IEC 60601. After a brief review of the overall risk management process, this presentation focuses on risk evaluation. FDA and EU guidance speak to the need that risk be reduced as low as possible, consistent with generally acknowledged state-of-the-art and international standards, which take into account economic and technological constraints. The future evolution of risk acceptability as technology advances, is also discussed.
The presentation focuses on what product design engineers need to know about the latest ANSI & ISO product warning label standards. The legal, risk and safety ramifications of product safety labels are of paramount importance to today's forward-thinking manufacturers. People's lives, product liability lawsuits and company futures are literally on the line when it comes to the quality of the safety labels placed on your products. The choice of format, the degree of content and the durability of materials used in their construction are all key to getting this job done right.
Selecting the appropriate circuit protection component is critical to safety and reliable operation. At best, improper component selection can be counterproductive – at worst it can lead to catastrophic failures. This presentation explores three fundamental protection components; the Gas Discharge Tube (GDT), the Metal Oxide Varistor (MOV) and fuse. The theory of operation of these devices is briefly reviewed, followed by the criteria necessary for appropriate selection.
Increasingly, the responsibilities of a power supply designer extend beyond merely meeting a functional specification, with designing to meet safety standards an important collateral task. Since all commercial and home-use supplies must eventually be certified as to safety, knowledge of the requirements should be a part of every designer’s repertoire. This simplified overview has been prepared with the collaboration of Underwriters Laboratories, to provide a basic introduction to the issues and design solutions implicit in assuring the safety for both the user and service personnel of your power supply products, as well as easing the certification process.
Timothy R. McEwen & Stephanie Alpert -
Underwriters Laboratories The comprehensive application of human factors engineering (HFE) in product development is an imperative. “User-friendliness" helps ensure that products are operated in a safe manner and helps foster a product's marketability. In some domains, such as the medical device industry, there is also a regulatory requirement to perform HFE en route to a final, validated design. In an effective HFE program, manufacturers perform detailed use-related risk analyses; revise their designs as needed to reduce risk to acceptable levels, and conduct validation tests to demonstrate that users will not commit potential harmful use errors.
George Ello - National Grid Electric distribution systems involve many aspects of safety. Basic concepts of distribution system design include grounding as well as step and touch potentials. Protective devices and fault clearing protect against damage due to electric faults or short circuits, and are as essential to a utility as they are to a building distribution system. Voltage issues such as back-feed, swells and lightning are also explored. Distributed generation and cable testing also present safety challenges. Small generators (Solar PV) impact existing protective relaying, circuit voltages, other customers and safety. Distribution cable requires special test techniques, such as to locate faults on underground cable.
Tom Lanzisero - Underwriters Laboratories This presentation welcomes new members to the newly-formed PSE society of the IEEE LI section. Membership list is provided along with a brief review of how the society can meet the needs of its members. Local opportunities and local networking are also covered. |
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Consider the benefits of presenting an IEEE PSES lecture. |
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| Home | 2016-12-16 | ||
Chair
Vice 
Power Supplies with Advanced Protection Features
Gary Raposa -
Keysight