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IEC 62040-2 EMC Testing of Uninterruptible Power Systems

IEC 62040 testing applies to movable, stationary, fixed or built-in, pluggable, and permanently connected uninterruptible power systems (UPS). As a leader in electromagnetic compatibility, EMC, regulatory compliance testing, Keystone Compliance assists electronic equipment manufacturers with EMC testing. Meeting the IEC, EN, and other EMC testing requirements can be challenging. Not only do we understand the challenges, but we help guide companies through the process.

Keystone takes pride in providing the peace of mind that all of your unintentional radiator testing needs will be met. We have a reputation for helping customers achieve their EMC product certifications. Keystone Compliance tailors each test plan to individual customer needs minimizing unnecessary costs and over-testing. Lastly, our strategic partnerships allow us to meet customer needs beyond our scope of accreditation. 

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Summary of IEC 62040 Uninterruptible Power Systems (UPS)

As mentioned above, IEC 62040 specifically applies to movable, stationary, fixed or built-in, pluggable, and permanently connected UPS. This is for use in low-voltage distribution systems with an environment being either residential, commercial, light industrial, or industrial. Port voltages must not exceed 1 500 V DC or 1 000 V AC and which include an energy storage device.

The UPS is subject to installing, operating, and maintaining in the manner specified by the manufacturer. This IEC 62040 standard defines emission limits, immunity levels, test methods, and performance criteria for a complete UPS to comply with essential EMC regulations.

IEC 62040 does not address EMC phenomena produced by loads connected to the UPS or situations created by any apparatus external to the UPS other than described in IEC 62040.

Lastly, this standard does not cover:

  • Low-voltage DC power supply devices are covered by IEC 61204 standards.
  • Systems wherein the output voltage is derived from a rotating machine.

Scope of IEC 62040-2 RF Compliance Testing

The EMC emission and immunity requirements are selected to ensure that disturbances generated by UPS operating normally do not reach a level that could prevent other apparatus from operating as intended.

Compliance is checked by testing against specific immunity requirements. The UPS must continue to operate without degradation and per applicable performance criteria.

Uninterruptible Power System (UPS) Conditions

The terms first and second environment will be used in the following classes below. The first environment includes residential, commercial, and light industrial premises directly connected, without intermediate transformers, to a public low-voltage mains supply. The second environment includes all commercial, light industry, and industrial locations other than those specified in the first environment.

Category C1 UPS: This category includes UPS intended for use without any restriction in the first environment. Category C1 UPS must comply with category 1 requirements for emission limits and immunity.

Category C2 UPS: This IEC 62040 category includes UPS intended for use without any restriction in the second environment. This UPS is also used in the first environment when the effect of the warning notice below is considered.

In residential areas, this product may cause radio interference. In which case, the user is required to take additional precautions.

Category C3 UPS: This includes UPS with an output current exceeding 16 A and intended for use in the second environment. C3 UPS must comply with C3 requirements for emission limits and immunity.

Category C4 UPS: Includes UPS that cannot be classified within any of the previous categories and intended for use in environments subject to particular requirements.

The UPS emission test is performed under the following conditions:

  • Rated input voltage
  • Normal mode and stored energy mode of operation
  • Resistive load that results in the highest disturbance level

The immunity test is performed with the following conditions:

  • Rated input voltage
  • Normal modes of operation
  • Linear load at rated activity output power or light load according to IEC 62040-3

Expert IEC 62040 Unintentional Radiator Testing

Keystone Compliance strives to give our customers more time and energy on product development instead of testing. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. Our team can accommodate fixed, mobile and portable devices of all sizes.

Complete our request a quote form to get a jump start on the conversation. Have a question about our RF testing lab and EMC regulatory compliance protocols? Contact us or call (724) 657-9940 and we will determine the best course of action.