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IEC 61293 โ Marking of Electrical Equipment with Ratings Related to Electrical Supply โ Safety Requirements
💡 Standard Overview: IEC 61293 establishes safety requirements for the marking of electrical supply ratings on electrical equipment. It specifies how rated voltage, current, frequency, and power shall be marked, including minimum legibility requirements, durability criteria, and the use of standardised symbols. This standard is a cornerstone of product safety certification and market surveillance worldwide.
1. Scope and Basic Requirements
IEC 61293 is a fundamental safety standard applicable to all mains-connected electrical equipment — from household appliances to industrial machinery, from information technology equipment to medical electrical devices. The standard’s core purpose is to ensure that equipment users can clearly and durably identify the electrical supply parameters required by the equipment, thereby preventing electrical accidents caused by mismatched supply connections (e.g., connecting a 110 V-rated device to a 220 V supply, or using an undersized supply cord causing overheating). The standard applies to rating plates, labels, printed markings, and directly moulded markings on equipment enclosures.
The standard mandates that electrical equipment must be marked with the following rated parameters: rated voltage or voltage range, nature of supply (AC/DC symbols), rated frequency or frequency range (for AC equipment), rated input current or rated power input, and the manufacturer’s name or trademark and model identifier. For equipment with multiple ratings (e.g., voltage-selectable devices), each rating must be clearly associated with its applicable supply conditions. All units must conform to the International System of Units (SI) or the standard symbols specified in IEC 60027.
| Parameter | Example | Standard Symbol | Unit |
|---|---|---|---|
| Rated Voltage | 220 V or 110-240 V | V | Volt |
| Nature of Supply | ～ or ⎓ | ～(AC) / ⎓(DC) | — |
| Rated Frequency | 50/60 Hz | Hz | Hertz |
| Rated Input Current | 2.5 A | A | Ampere |
| Rated Power Input | 500 W | W | Watt |
| Rated Apparent Power | 100 VA | VA | Volt-ampere |
2. Durability and Legibility Requirements
Marking durability is a technically emphasised requirement of IEC 61293. The standard stipulates that supply rating markings on equipment must remain legible throughout the equipment’s service life and must not become detached or illegible due to normal handling, cleaning, moisture exposure, or temperature variation. To verify compliance, the standard recommends a battery of tests: rub testing (a specified number of擦拭 cycles using cloths moistened with water or solvent), adhesion testing (for applied labels), and weathering tests (for outdoor equipment). The marking method must match the expected service life of the equipment — moulded-in or engraved markings offer the best durability, high-quality adhesive labels are generally acceptable, while simple self-adhesive stickers are acceptable only under specific limited conditions.
⚠️ Compliance Critical Points: (1) Minimum character height depends on the marking area and expected viewing distance — for handheld equipment, 6 pt is generally the minimum; for fixed installations, character height must increase approximately 1 mm per metre of viewing distance; (2) Colour contrast must be adequate — dark text on a light background or vice versa; (3) Multi-voltage equipment (e.g., 110-240 V universal power supplies) must show the complete voltage range — marking “110-240V” without also showing “50/60Hz” is insufficient; (4) Replaceable fuse ratings should be marked separately adjacent to the fuseholder to ensure correct replacement.
Regarding marking layout, the standard recommends that rated voltage and rated current (or rated power) be displayed on the same marking surface for convenient viewing. For products destined for global markets, the use of language-independent international symbols (as defined in IEC 60417) is strongly recommended. Symbols such as the AC symbol (IEC 60417-5032), the DC symbol (IEC 60417-5031), and the Class II equipment symbol (IEC 60417-5172, indicating double insulation) are universally understood across languages and eliminate the need for translation of the marking itself.
3. Coordination with Product Safety Standards and Conformity Assessment
IEC 61293 does not operate in isolation but works in concert with a broad family of product safety standards. Standards such as IEC 60950-1 (IT equipment safety), IEC 60335-1 (household appliance safety), IEC 61010-1 (measurement/laboratory equipment safety), and IEC 62368-1 (audio/video and ICT equipment safety) all reference IEC 61293 as the implementation specification for supply rating markings. This means that any product claiming compliance with these product safety standards must also satisfy the marking requirements of IEC 61293. During IECEE CB Scheme certification testing, inspectors specifically verify that supply rating markings conform to IEC 61293 requirements — non-compliant marking is a common cause of test failure.
✅ Product Compliance Recommendations: (1) Incorporate IEC 61293 marking requirements at the product design stage to avoid costly rework when non-compliant marking is discovered during certification testing; (2) For multi-country export products, use SI unit symbols and international symbols rather than language-specific text on the equipment body, providing translations in the accompanying documentation; (3) Laser engraving or screen printing provides the highest durability test pass rate; (4) Reserve adequate space on the rating plate design to accommodate all required information at appropriate character sizes; (5) Note that different product standards may impose additional marking position requirements — for example, IEC 60335-1 requires household appliance ratings to be on the appliance itself (marking on the packaging only is insufficient).
With the proliferation of IoT and smart devices, an increasing number of electrical products incorporate electronic display screens that could potentially present rating information digitally instead of relying solely on a physical nameplate. While IEC 61293 currently addresses physical marking primarily, displaying supply ratings on a persistent electronic display (e.g., in the “Settings” or “About” menu of a device with a permanent screen) is considered an acceptable supplementary method. However, physical marking remains the preferred approach because it remains accessible when the device is powered off or if the display fails. Standards development organisations are currently discussing guidelines for electronic rating displays, and future revisions of IEC 61293 are expected to address this evolving practice.
❓ Frequently Asked Questions
Q1: Does IEC 61293 apply to battery-powered equipment?
A: Yes. Battery-powered equipment should be marked with the battery voltage (e.g., 3.6 V) and/or rated power. If the device uses an external power adapter, the device body should show the adapter input voltage requirements or a statement such as “Use only with XX model power adapter.”
Q2: Can rating markings appear only in the user manual and not on the product itself?
A: No (with very limited exceptions). IEC 61293 requires rating markings to be visible on the equipment body or in a position visible during normal installation and use. Markings in the instruction manual alone are insufficient to satisfy the standard.
Q3: How should the rated current or power marking value be determined?
A: The rated input current shall be the maximum steady-state current the equipment draws under the most unfavourable combination of rated voltage and rated load conditions. For equipment containing motors, note that the starting current or locked-rotor current may be substantially higher than the steady-state value, but the rating marking should reflect the steady-state value.
Q4: What symbols should be used to connect voltage range values?
A: For a continuous voltage range (e.g., 100-240 V), use a dash “–” between the minimum and maximum values. For multiple discrete voltage values (e.g., 120/240 V), use a slash “/” to separate them. These two cases have different meanings — the former indicates the equipment can operate at any voltage within the range; the latter indicates the equipment can be internally switched to select different voltage settings.
