IEC 60601-1 Insulation test requirements for medical electrical equipment

The following are the requirements for insulation testing of medical electrical equipment according to the international standard IEC 60601-1, and the detailed test items and test methods are given below.

Safety distance detection

We first measure the shortest distance between conductive parts (electrical gap) with calipers and then check the shortest path (creepage distance) of the insulating surfaces. For example, for basic insulation of 220V equipment, the gap should be at least 3mm. special note: reinforced insulation requires twice the distance of double insulation.

High voltage withstand test

When tested:

Basic insulation equipment to withstand 2 times the operating voltage +1000V

For example, for equipment with an operating voltage of 100V, it is necessary to add 3000V high voltage

60 seconds with HT-9464M tester

Leakage current exceeding 10mA is considered unqualified

IEC 60601-1 Requirements for voltage withstand testing of medical electrical equipment

Verification of insulation performance

Three simple steps:

Apply 500V DC to equipment

Measurement of resistance value

Must be >10 megohms to pass This standard cannot be lowered even after 48 hours in an environment with a humidity of 93%.

Leakage protection test

IEC 60601-1 Leakage protection requirements for medical electrical equipment

Practical cases:

Patient leads of the ECG machine, leakage must be <10μA

General equipment shell leakage to <5mA

Tests should be performed with the ground wire intentionally disconnected to simulate a fault

Special testing programs

High-voltage equipment such as electric knives should be tested for more discharges:

expense or outlay HT 9464M Detect partial discharges, discharges exceeding 5pC should be returned for repair.

Key Parameters Quick Reference Table

Test Note

High temperature and high humidity pre-treatment first (40°C/93% humidity for 48 hours)

Different equipment should be treated differently:

Class Ⅰ equipment focus on checking the grounding

Class III equipment focuses on insulation

Risk assessment must be done in conjunction with ISO 14971