9/23/2023 0 Comments Norma ul508a pdf downloadThese requirements also do not cover EMI filters for outdoor use. Transient Voltage Surge Suppressors are investigated under the Standard for Surge Protective Devices, UL 1449. These filters consist of capacitors and inductors used alone or in combination with each other and may be provided with resistors.ġ.3 These requirements cover facility filters, cord-connected filters, and direct plug-in filters.ġ.4 These requirements do not cover transient-voltage surge suppressors (that is, devices for repeated limiting of voltage surges on power circuits such as silicone avalanche diodes, metal oxide varistors, gas tubes, spark-gaps, etc). ![]() ![]() 1.1 These requirements cover electromagnetic interference (EMI) filters installed on, or connected to, 1,000 V or lower potential circuits, 50 – 60 Hz, or up to 1,500 Vdc, and installed in accordance with the National Electrical Code, NFPA 70.ġ.2 These requirements cover filters used to attenuate unwanted radio-frequency signals (such as noise or interference) generated from electromagnetic sources.
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