UL 1283 Test Standard for Electromagnetic Interference Filters

EUROLAB laboratory provides testing and compliance services within the scope of UL 1283 standard. The UL 1283 standard covers electromagnetic interference (EMI) filters installed in or connected to 1.000 V or less potential circuits, up to 50 – 60 Hz or 1.500 Vdc, and installed in accordance with the National Electrical Code, NFPA 70.

These requirements cover filters used to reduce unwanted radio frequency signals (such as noise or interference) generated from electromagnetic sources. These filters consist of capacitors and inductors used alone or in combination with each other and can be equipped with resistors. These requirements cover plant filters, wired filters and direct plug-in filters.

These requirements do not cover transient voltage surge suppressors (i.e. devices for repeatedly limiting voltage surges in power circuits such as silicon avalanche diodes, metal oxide varistors, gas cylinders, spark gaps, etc.). Transient Voltage Surge Suppressors are examined under the Surge Protective Devices Standard, UL 1449. These requirements also do not cover EMI filters for outdoor use.

These requirements do not cover direct plug products and wired products with more than two outlets. A direct plug product that uses more than two receptacles and has an EMI filter, Supplementary Plugs and Sockets Standard, UL 498
examined within the scope of requirements for existing faucets. A hardwired product filter that uses more than two receptacles and has one EMI has been studied under the Standard for Replaceable Power Taps, UL 1363. The EMI filter portion of these products will be investigated to determine compliance with the requirements of this standard as applicable.

A component of a product covered by this standard must comply with the requirements of that component. A component contains a property or feature that is not necessary for the application of the component in the product covered by this standard; supersedes a requirement in this standard and is not required to comply with a specific requirement.

Certain components are lacking in build features or limited in performance features. Such components are intended for use only in limited conditions, such as certain temperatures do not exceed certain limits, and should be used only under these specific conditions.

For a filter with integrated overtemperature protection, the following tests must be carried out:

• A sample with integrated overtemperature protection in the circuit and the product cooled to the lowest rated ambient temperature value must be subjected to an overload current of 135% of the current rating of the maximum size branch circuit. The filter can be properly connected. The overload test current will be applied for 81 hour for test currents up to 1A and 81 hours for test currents greater than 2A or until the overtemperature protection trips the circuit. Over-temperature protection and a thermocouple should be placed on the maximum measured temperature. After testing, the state of the overtemperature protection should be observed and should not show any evidence of damage. The maximum temperatures measured are equal to or lower than the Operating Temperature of the overtemperature protection device with a tolerance of +5°C (+9°F).
  should be.
• A sample with the integrated overtemperature protection disabled or disabled, the overload current will be 150% of the overtemperature protection's current rating. The overload test current shall be applied for 81 hour for test currents up to 1A and for 81 hours for test currents greater than 2A. The product must not show any signs of ignition, sealant leakage, cracking, breakage or other physical damage.

Our organization, EUROLAB, provides test standard services for electromagnetic interference filters, within the framework of national and international standards, with its trained and expert staff and advanced technological equipment, among numerous test, measurement, analysis and evaluation studies. EUROLAB provides testing services under the UL 1283 standard, do not hesitate to contact us.