Will a cart-mounted device creep down a ramp when parked, or tip over when someone pushes it? Can a lifting mechanism trap a finger? Is a suspension arm or patient support strong enough? IEC 60601-1 (GB 9706.1 in China) answers these questions in Clause 9, "Protection against mechanical hazards of ME equipment and ME systems". This article walks through the eight subclauses: scope, test methods, verdict logic, pre-submission checks, and where the work is done at SUNGO.
Key points
- Most Clause 9 requirements aim at reducing risk to an acceptable level. Compliance is usually shown by three things together: inspection of the sample, review of the risk management file and accompanying documents, and tests where needed. Without documents, many subclauses cannot be concluded.
- This article gives no numerical values (tilt angles, push forces, threshold dimensions, mass thresholds, safety factors, noise or vibration limits). Take those from the standard itself.
- Where a particular standard (IEC 60601-2-x and similar) applies, it supplements or modifies Clause 9; the general standard alone is not enough.
- At SUNGO, IEC 60601-1, EN 60601-1 and GB 9706.1 are handled by the Hefei laboratory, within its IAS accreditation (TL-1119). The scope lists each as the whole standard, without a year; confirm the edition with the laboratory before ordering a report.
Standards and scope
Designations and editions
IEC 60601-1 is the general standard for the basic safety and essential performance of medical electrical equipment. As of 2026-10-22, the IEC Webstore lists consolidated edition 3.2 (IEC 60601-1:2005+AMD1:2012+AMD2:2020 CSV), published on 2020-08-20 (responsible committee: IEC TC 62/SC 62A), with a stability date of 2028. The IEC notes that collateral or particular standards supplement or modify the general requirements for certain equipment, and that where particular standards exist, the general standard should not be used alone.
GB 9706.1-2020 (Medical electrical equipment - Part 1: General requirements for basic safety and essential performance) is a mandatory Chinese national standard, issued on 2020-04-09 and in force from 2023-05-01. It is a modified adoption of IEC 60601-1:2012 and replaced GB 9706.1-2007 and GB 9706.15-2008. Because it was issued before IEC Amendment 2 (2020-08-20), some subclauses may differ from IEC edition 3.2; the respective texts govern. EN 60601-1 is the European adoption.
How Clause 9 is organized
| Subclause | IEC title | Main topics |
|---|---|---|
| 9.1 | MECHANICAL HAZARDS of ME EQUIPMENT | General; Table 19 lists the hazards covered |
| 9.2 | MECHANICAL HAZARDS associated with moving parts | Trapping zones and acceptable gaps (Table 20), unintended movement, overtravel, emergency stop, patient release |
| 9.3 | MECHANICAL HAZARD associated with surfaces, corners and edges | Rough surfaces, sharp corners and edges |
| 9.4 | Instability HAZARDS | Overbalance, external forces, castors and wheels, sliding, handles |
| 9.5 | Expelled parts HAZARD | Expelled parts, including cathode ray tubes |
| 9.6 | Acoustic energy (including infra- and ultrasound) and vibration | Audible sound, infra- and ultrasound, hand-transmitted vibration |
| 9.7 | Pressure vessels and parts subject to pneumatic and hydraulic pressure | Pressure vessels, pneumatic and hydraulic parts, control and relief devices |
| 9.8 | MECHANICAL HAZARDS associated with support systems | Tensile safety factor (Table 21), patient supports, mechanical protective devices |
Mechanical strength (including drop testing, 15.3) and mechanical hazards of ME systems (16.7) are not covered here, nor are wheelchairs and other assistive products, which have their own standards.
Subclause by subclause
The requirement topics below follow the text of IEC 60601-1:2005+AMD1:2012 (edition 3.1). AMD2:2020 changed parts of Clause 9; the titles of Figures 32 and 33, for example, are different in edition 3.2. When evaluating to edition 3.2, the standard itself governs.
9.1 and 9.2: moving parts and trapping
What is assessed. 9.1 is general; Table 19 (MECHANICAL HAZARDS covered by this clause) lists the hazard types. 9.2 requires risks from moving parts to be acceptable when the equipment is properly installed, used per the accompanying documents, and under reasonably foreseeable misuse. For trapping zones (where a body part can be crushed or sheared) the standard offers several routes: gaps meeting Table 20 (Acceptable gaps); sufficient safe distances (ISO 13857:2008 is a normative reference); guards and other risk control measures; or continuous activation, so that movement stops when the control is released. Where these conflict with the intended use, the speed of movement is limited so the operator stays in control.
9.2.3 covers other hazards of moving parts; 9.2.3.1 deals with unintended movement (such as accidental actuation of a control), and there are requirements on overtravel. Where an emergency stopping device is needed, its provision, marking, operation and reset are specified. After a breakdown, power failure or emergency stop, the patient must be releasable quickly and safely.
Method and verdict. Mostly inspection and measurement: find trapping zones over the full travel and compare gaps with Table 20; check that fixed guards need a tool to remove and that opening a movable guard stops motion and prevents restart; functionally verify continuous-activation controls, emergency stops and patient release; and review the risk management file. For control systems where single fault conditions matter, the standard requires a second risk control measure or single-fault-safe design, under the conditions it states.
Before submission. List every moving part (lifting, tilting, rotating, telescoping, folding), mark each trapping zone and its gap, and measure at the top, bottom and middle of travel. Explain in the instructions for use how the patient is released when power is lost.
9.3: surfaces, corners and edges
Rough surfaces, sharp corners and edges that could cause injury or damage must be avoided or covered. This is checked mainly by sight and touch.
Before submission. Look closely at folded sheet-metal edges, cut ends of extrusions, the inside of handles and edges exposed when an accessory is removed.
9.4: instability
What is assessed. Apart from fixed equipment, equipment placed on a floor, table or other surface must not overbalance or move unexpectedly in normal use. The topics are:
- Overbalance, in the transport position and outside it (9.4.2.2 is "Instability excluding transport position"). The equipment is prepared as the accompanying documents describe and placed on an inclined plane; Figure A.16 in Annex A illustrates the test conditions. Angles, loading, configuration, and the cases where a warning may be used instead, are as specified in the standard.
- Horizontal and vertical forces. Floor-standing equipment at or above a certain mass must not overbalance when pushed or leaned on, and equipment on a floor or table must not overbalance when sat or stepped on. Surfaces with such a risk need a permanent warning. Force, height and direction are as specified.
- Castors and wheels. Moving or parking mobile equipment must not create an unacceptable risk, the push force is limited, and mobile equipment above a certain mass must pass over a threshold (9.4.2.4.3, Movement over a threshold) without overbalancing.
- Unwanted lateral movement (including sliding). Brakes on power-driven mobile equipment, locking devices, and whether locked equipment on an incline moves beyond the permitted amount in the transport position (9.4.3.1, Instability in transport position). Outside the transport position there is a lateral stability test with an applied force as well as the incline test; see the standard for details.
- Grips and handling devices. Equipment above a certain mass that has to be lifted needs suitable handling means or a safe lifting method in the accompanying documents; handles and fixings are load tested.
Method and verdict. Testing typically uses an adjustable tilting platform, force gauges, a threshold obstacle and scales. The worst-case configuration is tested. The verdict covers tipping, movement when locked, push force, crossing the threshold without overbalancing (other criteria as in the standard), and consistency of warnings and instructions with the results.
Before submission. Identify the configuration with the highest, most offset centre of gravity: all accessories fitted, drawers or trays extended, raised fully, display arms extended. Describe the transport position and moving method in the instructions, and make the sample's warning labels match them.
9.5: expelled parts
Where expelled parts (for example a fractured rotating part or fragments of a pressurized component) could result in an unacceptable risk, the equipment needs protective means. Compliance is checked by assessing the suitability of the protective means and inspecting the risk management file. Equipment with a cathode ray tube has a dedicated requirement; IEC 61965, Mechanical safety of cathode ray tubes, is among the normative references.
Before submission. List fans, pumps, motors and other fast-rotating parts and pressurized components, explain how the enclosure or guards would contain any fragments, and record the assessment in the risk management file.
9.6: acoustic energy and vibration
What is assessed. Acoustic energy and vibration must not expose people to unacceptable risk. 9.6.2 covers acoustic energy, with 9.6.2.1 setting limits on audible acoustic energy for patients, operators and others in normal use; there are also provisions on infrasound and ultrasound. Where hand-transmitted vibration exceeds specified values, protective measures are required. Limits and the treatment of exposure time are as given in the standard.
Method. The normative references include sound level meters (IEC 61672-1, IEC 61672-2), sound power determination (ISO 3746, ISO 9614-1) and hand-transmitted vibration (ISO 5349-1); how they are applied is as stated in the standard. Identify the noisiest operating condition first, such as pumps, fans or motors at full load.
Before submission. Noise reduction must not compromise the audibility of alarm signals, which are covered by IEC 60601-1-8.
9.7: pressure vessels and pneumatic or hydraulic parts
What is assessed. Loss of pressure or vacuum, or a fluid jet caused by leakage or a component failure, must not create an unacceptable risk. The following apply where an unacceptable risk could result: parts such as pipes and hoses need protection against harmful external effects; when the equipment is isolated from its power supply, reservoirs and similar vessels should depressurize automatically or, failing that, allow isolation or local depressurization with a pressure indication; and parts still under pressure after isolation need clearly identified exhaust devices and a warning to depressurize them before adjustment or maintenance. The maximum pressure each part can be subjected to in normal and single fault conditions must be determined and must not exceed the pressure the standard permits for that part. Pressure vessels above specified conditions undergo a hydraulic test; Figure 32 (Ratio between hydraulic test pressure and maximum equipment pressure) gives the ratio. Take the edition 3.2 terms and criteria from the standard itself. Pressure-control and pressure-relief devices have their own requirements.
Before submission. Prepare pneumatic and hydraulic schematics, component ratings, the relief valve specification and set point, and vessel volume and design pressure.
9.8: support systems and safety factors
What is assessed. 9.8.1 applies to parts that support loads or provide actuating forces where a mechanical failure could present an unacceptable risk. Construction is based on Table 21 and the TOTAL LOAD; accessory attachments must prevent incorrect fitting; the risk analysis must consider static, dynamic and impact loads, temperature, environment and conditions of use, and failure modes such as excessive deflection, fracture, fatigue, wear and creep. Equipment fixed to a wall, ceiling or similar structure needs installation instructions.
9.8.2 covers the tensile safety factor. Support systems must keep their structural integrity over the expected service life, with tensile safety factors not below Table 21 (Determination of TENSILE SAFETY FACTOR), unless another method demonstrates that integrity (other exceptions are given in the standard). Table 21 sets minimum factors by the situation of the supporting part (for example whether it is impaired by wear and how ductile the material is); categories and values are in the standard. Figure A.17 in Annex A shows a worked example. Compliance is mainly checked by inspecting the equipment, risk management file and material and processing specifications. Where a test is needed, a test load of the TOTAL LOAD times the required tensile safety factor is applied; loading method, duration and criteria are as given in the standard.
9.8.3 covers the strength of patient or operator support and suspension systems. Their safe working load is the mass of the person plus accessories; the default body mass and marking requirements are in the standard. 9.8.3.2 deals with static forces and 9.8.3.3 with dynamic forces due to loading from persons. In edition 3.2, Figure 33 is titled "Body upper-carriage module"; the test method is as specified in the standard.
The standard also distinguishes support systems with and without mechanical protective devices. A protective device must be designed for the load, act before movement creates an unacceptable risk, and make its activation obvious to the operator. A test in which a load-bearing element (chain, cable, belt, jack screw nut, hydraulic hose and the like) is defeated verifies the device where the standard requires it. Without a protective device, the risk management file must assess the risks from wear.
Before submission. Prepare load calculations for support and lifting structures, material data for load-bearing parts and fastener specifications. Keep the maximum patient mass and safe working load consistent between the sample's markings and the instructions.
Accreditation scope
Each row is taken from the scope of the Hefei laboratory's IAS accreditation (TL-1119), with items, clauses and limitations as listed:
| Standard | Item | Clause | Notes / limitations |
|---|---|---|---|
| IEC 60601-1 | Whole standard | No clause listed | No limitation listed; no year given |
| EN 60601-1 | Whole standard | No clause listed | No limitation listed; no year given |
| GB 9706.1 | Whole standard | No clause listed | No limitation listed; no year given |
| IEC 60601-1-11 | Whole standard | No clause listed | Collateral standard for the home healthcare environment; no limitation listed; no year given |
| EN 60601-1-11 | Whole standard | No clause listed | No limitation listed; no year given |
| YY 9706.111 | Whole standard | No clause listed | No limitation listed; no year given |
Where the work is done at SUNGO
- Clause 9 evaluations to IEC 60601-1, EN 60601-1 and GB 9706.1 are done by the Hefei laboratory, within its IAS accreditation (TL-1119). The laboratory belongs to Hefei SUNGO Medical Technology Co., Ltd., a separate legal entity in Zipeng Town, Feixi County, Hefei, Anhui Province.
- Standards in the IAS scope carry no year. If you need a report to IEC edition 3.2, GB 9706.1-2020 or a specific EN edition, confirm it with the laboratory before ordering.
- Equipment for the home healthcare environment should also be evaluated to IEC 60601-1-11, which is in the same IAS scope together with EN 60601-1-11 and YY 9706.111.
- The only particular standards in the scope are those for oxygen concentrators: ISO 80601-2-69, EN ISO 80601-2-69 and YY 9706.269 (see Oxygen Concentrator Testing: ISO 80601-2-69, IEC 60601-1 and IEC 60601-1-2). Clause 9 changes made by other particular standards are outside SUNGO's accreditation.
- Some subclauses (unintended movement, for example) draw on the manufacturer's usability engineering. IEC 60601-1-6 and IEC 62366-1 are not in SUNGO's scope; those conclusions come from the manufacturer's documentation.
- Acceptance of a report for registration in any country or region depends on that regulator. SUNGO makes no commitment on acceptance.
Common issues in other clauses are discussed in Electrical Safety Failures: Creepage, Earthing and Leakage Current. Service overview: medical electrical safety testing.
Preparing your submission
General points
- Sample: complete equipment matching the design to be marketed, with all accessories and options. For several models, describe differences in construction, mass, moving parts and support systems so a representative sample can be chosen.
- Accompanying documents: instructions for use and technical description, covering transport position, moving and lifting, installation, maximum patient mass or safe working load, warnings and markings.
- Risk management file: covering the mechanical hazards addressed by this clause.
- Technical data: specifications for castors, brakes, actuators, gas springs, chains and cables, pressurized parts and relief valves; a list of moving-part gaps; load and safety factor calculations; centre of gravity data.
- Destructive tests: support system loading and protective-device tests can damage the sample or parts. Agree on samples and spares with the laboratory before ordering.
Samples by equipment type
- Carts, mobile and floor-standing equipment: submit the complete unit with castors, brakes, handles, baskets and other accessories, since the overbalance, push force, threshold and locking tests all need it. Identify surfaces that could be pushed, leaned, sat or stepped on, and make sure adjustable parts can be set to their extremes.
- Equipment with lifting mechanisms: describe the full travel and end stops, the emergency stop and patient release after power failure, and provide safety factor calculations and a description of any mechanical protective device.
FAQ
Can we test Clause 9 only?
The IAS scope lists IEC 60601-1 as the whole standard. Whether Clause 9 or part of it can be evaluated on its own, and how the report would state that scope, should be confirmed with the laboratory when you request a quote.
Is Clause 9 of GB 9706.1-2020 the same as in IEC 60601-1?
GB 9706.1-2020 is a modified adoption of IEC 60601-1:2012 and was issued before IEC Amendment 2. How its clauses correspond and where they differ is governed by the GB text itself. Evaluation follows the edition confirmed at ordering.
Our product has a particular standard. Does Clause 9 still apply?
A requirement of a particular standard takes priority over the general standard. Particular standards may modify, replace or delete Clause 9 requirements and may add others. Only the ISO 80601-2-69 series is in SUNGO's scope; changes made by other particular standards are outside SUNGO's accreditation.
Does the support system safety factor always need destructive loading?
No. The standard allows compliance to be confirmed by inspecting the equipment, risk management file and material and processing specifications, and allows other methods of demonstrating structural integrity over the expected service life. Where a test is needed, a load of the TOTAL LOAD times the required factor is applied, with criteria as given in the standard.
Requesting a quote
Please include the product name and intended use, models and configurations, mass and overall dimensions, whether there is a lifting or other moving mechanism, whether there are pressurized parts, target markets and intended standard editions, and the tables of contents of your instructions for use and risk management file. The Hefei laboratory will then confirm the scope and sample arrangements. Send your request through the contact page.