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Linsheng, A Concise And Comprehensive LED Lighting Safety Rules   

Update:12-02-2019
Summary:

Linsheng explains that the general safety requirements […]

Linsheng explains that the general safety requirements for LED luminaire products means that LED luminaires should be designed and manufactured so that they can work safely during normal use without harm to people or the surrounding environment.

  

For the safety of the manufactured products, the items must be 100% checked when they are shipped from the factory:

1. Identification / rated voltage, frequency, power, color temperature, etc.;

2. Lighting test / functional test;

3. Pressure resistance (absolute green strength) test;

4. Continuous grounding test.

Protection against electric shock is divided into:

Class 0 lamps: relying on basic insulation as a lamp for protection against electric shock, such countries are strictly prohibited from producing and selling;

Class I luminaires: The illuminating protection of luminaires not only relies on basic insulation, but also includes additional safety measures, that is, accessible conductive parts are connected to the protective earthing conductors in the fixed wiring of the facility, making accessible conductive parts in case When the basic insulation fails, it will not be charged;

Class II luminaires: The protection against electric shock of luminaires not only relies on basic insulation, but also has additional safety measures such as double insulation or reinforced green, no protective earthing or measures dependent on installation conditions;

Class III luminaires: Protection against electric shock relies on a supply voltage that is safely low voltage and does not produce luminaires above the very low (SELV) voltage.

Many small factories have no safety awareness, and LED lamps can be lit. Many engineers say that LED lamps and lanterns can damage LED lamp beads with a single pressure. This understanding is wrong and very unsafe.

As a merchant, we must strictly control the quality of our products and meet the requirements of safety standards.

Then how much pressure should be applied during the production process?

Class I lamps are 2U+1000V/1 minute

LED lamp protection grounding continuity and protection against electric shock

1. Continuity of protective grounding of LED lamps (second and third types of lamps are not applicable)

The protective grounding terminal on the LED luminaire is between the most accessible parts that may become charged. The key to the protective grounding is the continuity of the grounding and the reliability of the grounding, so that the detected protective earthing continuity resistance is ≤0.5 ohms.

Then first determine which parts are to be protected from grounding, then solve the continuity between the parts that need protective grounding and the terminals.

1. It can be touched when the lamp is installed, and it can become a charged part when the insulation fails.

2. Accessible when the luminaire is clean and open, and may become a live part when the singularity fails.

3. The metal mounting surface where the safety components in the luminaire are located,

4. Metal surfaces that come into contact with or may come into contact with safety components (such as wires, controls) in the luminaire,

5. More importantly, we must ensure the continuity between them from the structure.

6. Conductors marked with yellow-green two-color lines, whether internal or external, should be connected only to the grounding terminal.

7. Use self-tapping screws to protect the continuity of the ground, as long as it does not interfere with the connection during normal use, and use at least two screws for each joint.

8. Aluminum and copper can not be directly connected to the ground, which will cause the contact resistance to increase due to electrochemical reaction, which affects the continuous low resistance of the ground.

9. Grounding resistance measurement, can be adjusted to 12V, 10A detection, resistance value ≤ 0.5 ohm,

Note: The continuity of grounding is mainly the above points. The detailed national standards are subject to

2. Protection against electric shock

LED luminaires should be constructed so that when the LED luminaires are installed and wired as in normal use and when the LED light source (module) or electrical components are replaced, the luminaire must be turned on, even if it is not hand-operated, the live parts are inaccessible. Basic insulation parts should not be used on the outer surface of luminaires that are not protected against accidental contact.

1. The insulation properties of paint, enamel, paper and similar materials should not be relied upon to provide the required protection against electric shock and short-circuit protection;

2. A luminaire equipped with a capacitor larger than 0.5 uf capacitor shall be equipped with a discharge device so that the voltage between the voltmeter and the rated voltage is 1 min, and the voltage across the capacitor shall not exceed 50 V;

3. The cover and other components providing protection against electric shock shall have sufficient mechanical strength and shall be securely fixed and will not loosen during normal operation;

4. Use the test finger to touch every possible touched position, apply a force of 10 N if necessary, and use an electric indicator to indicate contact with live parts. The movable parts, including the lampshade, should be placed in the most unfavorable position by hand. Location, if the movable parts are metal parts, they should not touch the live parts of the luminaire or LED light source (module).

Anti-electric shock protection safety extra low voltage ≤ 50V, mechanical strength, as well as clearance, creepage distance, etc. are all factors to be considered.

Q&A

Q: Why do some LED luminaires turn off the switch when the user is using it?

A: There are two problems. First, the product design has leakage (>10uA);

Second, when the user installs, the live and neutral wires are connected incorrectly, or the switch has indicators to form a loop.

It is impossible to cause electromagnetic wave interference. No matter what strong electromagnetic wave, people can't stand it.

Adding a leakage resistor can only discharge and discharge the voltage on the capacitor, and it is not possible to discharge the power supply voltage.

Q: Can you 24V? Why do you want 12V, 10A detection?

A: This should be selected according to the power of the detected object, not limited to 12V! International standards are also only for reference.

24V can be, but the national standard adopts 6~12v, and the international standard is the same. You are above the standard and it is an enterprise standard.

Therefore, we must be safe to put lighting products first.