一, Anti electric shock protection: graded protection and insulation design
1. Classification of Protection Levels
According to the International Electrotechnical Commission (IEC) standards, the anti electric shock protection of LED linear lamps is divided into four categories:
Class 0 lighting fixtures: relying solely on basic insulation, they have been banned from production and sale in most countries around the world.
Class I lighting fixtures: require protective grounding measures to ensure that the metal casing does not become electrified in the event of insulation failure. For example, the Chinese standard GB 7000 series requires that the grounding resistance of Class I lamps be ≤ 0.5 Ω and must be verified through 10A/12V testing.
Class II lighting fixtures: using double insulation or reinforced insulation, without the need for grounding. Its insulation withstand voltage needs to reach 4U+2750V (U is the local grid voltage), suitable for humid environments or places without grounding conditions.
Class III lighting fixtures: powered by SELV (Safety Extra Low Voltage), with a voltage not exceeding 50V, suitable for children's activity areas or high humidity environments.
2. Insulation materials and structural requirements
Basic insulation: It needs to meet the 2U+1000V withstand voltage test to ensure electrical isolation between live parts and accessible parts.
Additional insulation: Provide secondary protection in the event of basic insulation failure, with a withstand voltage value of 2U+1750V.
Strengthening insulation: Equivalent to double insulation, but structurally inseparable, with voltage resistance requirements consistent with double insulation.
3. Protection of accessible components
The accessible parts such as the lamp housing, heat sink, and mounting bracket must pass IP testing (such as IP20 dust and electric shock prevention), and the surface must not rely on paint or enamel to provide insulation.
Movable parts such as lampshades and lenses must have mechanical strength, and must not touch live parts when placed in the most unfavorable position with bare hands.
二, Electrical safety: Voltage resistance, grounding, and electromagnetic compatibility
1. Voltage withstand test
Class I lighting fixtures: require a 2U+1000V/1-minute withstand voltage test to verify the reliability of the insulation system.
Class II lighting fixtures: require a 4U+2750V withstand voltage test to ensure the effectiveness of double insulation or reinforced insulation.
Class III lighting fixtures: The voltage stability of the SELV circuit needs to be verified to ensure that the output voltage does not exceed 50V.
2. Grounding continuity
The resistance between the grounding terminal of Class I lighting fixtures and accessible metal parts should be ≤ 0.5 Ω, and the grounding screw should be designed to prevent loosening.
The grounding wire should be marked with yellow and green dual color markings, with a cross-sectional area of not less than 1.5mm ² (copper wire).
3. Electromagnetic compatibility (EMC)
The lighting fixtures need to pass radiation emission (RE) and conduction emission (CE) tests to ensure that they do not interfere with wireless communication devices.
The anti-interference test needs to cover scenarios such as electrostatic discharge (ESD) and electrical fast transient (EFT).
三, Mechanical structure: strength, durability, and corrosion resistance
1. Mechanical strength
The outer shell of the lighting fixture needs to pass a drop test (such as freely dropping from a height of 1 meter to a hard ground) to ensure that there are no cracks or permanent deformations.
The suspension device needs to withstand a tensile test of 5 times the weight of the lamp for 1 minute without breaking or loosening.
2. Durability testing
The switch needs to pass 50000 cycles of testing, and the wiring terminals need to pass 100 insertion and extraction tests.
The power cord needs to undergo a bending test (such as 15 times per minute for a total of 10000 times) to ensure that the insulation layer is not damaged.
3. Anti corrosion design
The metal components of lamps with an IP20 rating or higher should be made of galvanized, spray painted, or stainless steel materials to ensure that they do not rust in humid environments.
Outdoor lighting fixtures need to pass a salt spray test (such as a 48 hour neutral salt spray) to verify the durability of the anti-corrosion coating.
四, Environmental adaptability: temperature, humidity, and protection level
1. Temperature testing
The lamp should work normally in an environment between -20 ℃ and 50 ℃, and the surface temperature should not exceed 65 ℃ (to prevent burns).
Components such as ballasts and drive power supplies must undergo high-temperature aging testing (such as 85 ℃/1000 hours).
2. Protection level (IP)
Indoor lighting fixtures are usually IP20, while outdoor lighting fixtures need to reach IP65 (dustproof and waterproof) or IP67 (capable of short-term immersion).
Landscape lighting line lights must comply with the T/CALI 0601-2017 standard, specifying mechanical interfaces, electrical interfaces, and optical performance requirements.
3. Special environmental requirements
Explosion proof lighting fixtures (such as Ex d II CT4 grade) are required for explosive gas environments.
The food processing area requires the use of IP69K rated lighting fixtures that can withstand high-pressure water gun flushing.
五, Certification System: Global Standards and Market Access
1. International certification
CE certification: EU market access mark, covering LVD (Low Voltage Directive) and EMC directives.
UL certification: North American market safety certification, required to comply with UL 1598 (ordinary lamps) or UL 2388 (soft strip lamps) standards.
SAA certification: Australian market access mark, requiring electrical safety, electromagnetic compatibility, and energy efficiency testing.
2. Chinese standards
GB 7000 series: corresponds to the IEC 60598 standard, covering safety, performance, and energy efficiency requirements for lighting fixtures.
CCC certification: China's mandatory product certification, lighting fixtures that have not been certified shall not be sold.
3. Energy efficiency and environmental protection
Energy Star certification: The US energy efficiency label requires lamps to have an energy efficiency of ≥ 100 lm/W.
RoHS certification: Restrictions on the use of harmful substances such as lead and mercury are mandatory in the EU market.
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