EMC in Medical Technology — IEC 60601-1-2 explained.

Medical devices must operate safely even in the electromagnetically noisy day-to-day of a clinic. IEC 60601-1-2 governs EMC — and links it closely to risk management.

Secure medical technology EMC

What the standard governs

IEC 60601-1-2 is the EMC collateral standard for medical electrical equipment and systems. It defines requirements for emissions and immunity, including test levels. The 4th edition (IEC 60601-1-2:2014) was extended by Amendment 1 to edition 4.1 (2020).

Three intended-use environments

Instead of the former classification into life-supporting / non-life-supporting, the 4th edition defines the test levels according to the intended-use environment:

Professional healthcare facility (hospital, practice)
Home healthcare
Special environments (e.g. industrial or military settings)

Devices for home use tend to have to meet higher immunity levels, because the environment is less controlled.

Immunity to wireless devices

New in the 4th edition are requirements for immunity to RF fields from wireless communication devices (mobile phone, Wi-Fi, Bluetooth) in close proximity — tested at defined frequency points with elevated field strengths.

Close coupling to risk management

The 4th edition puts risk management at the center (Annex F, in conjunction with ISO 14971): reasonably foreseeable electromagnetic disturbances must be taken into account in the risk management process.

Frequently Asked Questions

Why are the requirements stricter at home?

In a professional healthcare facility, the electromagnetic environment is better controlled. In the home environment, devices are closer to interference sources (household appliances, radio), hence the higher immunity requirements.

What does EMC have to do with ISO 14971?

The 4th edition requires EMC risks to be considered as part of medical risk management (ISO 14971) — EMC is therefore no longer an isolated test, but part of the device's safety assessment.

Sources: Johner-Institut — IEC 60601-1-2, Eurofins/MET — 60601-1-2 4th Edition. The applicable version of the standard is authoritative.