IEEE C62.62-2010 pdf free download.IEEE Standard Test Specifcations for Surge-Protective Devices (SPDs) for Use on the Load Side of the Service Equipment in Low-Voltage (1000 V and Less) AC Power Circuits.
4. Service conditions 4.1 Normal service conditions SPDs conforming to this standard shall be capable of operating under the conditions listed in the following list. These conditions shall be defned by the manufacturer or the end user, as appropriate (for standard test conditions, see 5.4): a) Ambient temperature range (typically −5 °C to +40 °C) b) Altitude (less than 2000 m) c) Humidity (indoor, 30% to 90%; outdoor, determined by the interested parties) d) Frequency range (50 Hz or 60 Hz, ± 2 Hz) e) Voltage range (+6%/−13% of nominal system voltage) (ANSI C84.1-2016 [B2]) 4.2 Nonstandard service conditions The following service conditions could require special consideration in the design or application of SPDs, and they should be called to the attention of the manufacturer. When any such conditions apply, they shall be specifed by the user or included in the specifcations of the manufacturer: a) Ambient temperature differing from the normal service conditions b) Altitude or atmospheric pressure differing from the normal service conditions c) Exposure to fumes, vapors, salt spray, water, dirt, chemicals, explosive atmospheres, abnormal shock, or vibration d) Limitations on weight and specifcations e) Unusual transportation or storage f) Seismic ratings
Testing of electrical equipment and machines, including SPDs, can expose personnel to electrical hazards. Hazards from direct contact include electric shock and arc fash. Hazards from indirect contact include electromagnetic felds. All persons conducting SPD testing shall be qualifed and trained to work on or near exposed live (energized) circuits and trained to operate the test equipment involved. Prior to conducting testing of SPDs, qualifed employees shall conduct a risk assessment to identify and minimize the risk of exposure to electrical hazards. Common methods of determining risk levels involves an analysis of the severity of harm, possibility of avoidance, and frequency of occurrence (see ANSI B11.0-2015 [B1]). The preferred methods of risk reduction (see Figure A.3), in order of preference, are as follows: a) Elimination of the hazards b) Substitution c) Guarding d) Safety controls e) Operating procedures f) Training g) Personal protective equipment (PPE) During the testing of the SPDs, qualifed personnel should wear appropriate PPE, and follow safe work procedures to reduce the risk of shock and arc fash hazards. Persons who have prosthetic devices or medical implants, including pacemakers, insulin pumps, and the like, should maintain a safe distance from the surge generating equipment to reduce the risk of electromagnetic hazards. High-energy impulse testing of SPDs, especially when the SPD is attached to an ac power source with appreciable source currents, can lead to catastrophic failure of the SPD. This failure could include the ignition or explosion of the SPD or its internal components. The qualifed person(s) conducting the equipment testing must be aware of the potential of a powerful failure and take all the necessary precautions to address the fallout from this type of failure. Factors to be considered while examining a device prior to testing include the following:
— The amount of combustible material likely to be involved initially — The probable rate of propagation — The consequences of such propagation, that is, the probability of extension beyond the SPD Appropriate precautions shall be taken to keep these factors within manageable limits. Precautions may include suitable extinguishing agents in suffcient quantity, physical separation from other combustibles, or other appropriate measures. In evaluating the possibility of explosion, consideration should be given to component failure whenever hazardous materials are available in suffcient quantity to create an explosive atmosphere. The voltage and current levels generally associated with surge testing are well above those considered lethal, with short-duration voltages typically up to 20 000 V and impulse currents typically up to 10 000 A or higher. Steady-state voltages can typically be up to 600 V rms with a fault current potential of thousands of amperes. Considerations to the risk of accidental discharge of the surge generator, the consequences of a fashover to an unfavorable circuit, the possibility of a charge being trapped in the SPD, or the consequence of a violent component failure should be considered. Test personnel should never stand in the line of sight of components on printed circuit boards or panels with the enclosure open during SPD surge testing. On occasion, a component can unexpectedly fail in an explosive manner during surge testing. Fragments of the ruptured case and the component might cause injury to personnel in the vicinity. If visual observation is required, a suitable transparent barrier shall be provided. Surge testing of SPDs is best conducted only in an area dedicated solely to that purpose. The boundaries of the area should be clearly defned and appropriately marked. The surge test area should be kept free of all materials, meters, and test setups that are not associated with the surge test being conducted (see the example in A.14).