Common led 10w fluorescent lamp, Dimensions, the basic reference T8, T10 fluorescent lamp design, different places is that the light source to use different materials, LED fluorescent lamp with built-in power supply (does not rule out some designed to power external) and the traditional two side rely on external ballasts for fluorescent lamps excited. From an electrical standpoint, LED fluorescent lamp is both light again mimicking fixtures, it has to comply with the double-ended fluorescent lamp safety standards GB18774-2002 lamp part of the size and heat-resistant, fire-resistant requirements, also need to meet the lighting standards GB7000.1-2007 standards and GB19510.1-2009 standard on the structure, the internal line, creepage distances and clearances, insulation and dielectric strength, heat resistance, fire resistance and other aspects of the whole lights and built-in LED driver power requirements.
This will combine the GB18774-2002 and GB7000.1-2007 standard content, structure, internal wiring, electric shock protection, insulation resistance and dielectric strength, creepage distances and clearances, heat and fire resistance of these aspects LED fluorescent possible security problems.
First, the structure
Prone to problems of High Power LED 50W fluorescent lamp, screws, basic insulation with accessible metal parts in contact with these three places. Lamp needs to meet the size requirements of the torque test specified in GB18774-2002 and GB2799-2001 provisions. Among them, the torque test requirements specified in GB18774-2002 before and after the high temperature test must comply with the provisions of 2.3.1 of the standard, torque test is imposed, the rotation between the various components of the lamp is not more than 6 °. High temperature conditions imposed by the lamp (125 ± 5) ° C, heating time (2000 ± 50) h. If you are using a G13 lamp and lamp power greater than 40W, high temperature conditions as follows: (140 ± 5) ℃. High temperature conditions and duration of the relatively harsh assessment of LED fluorescent lamp to the use of plastic materials, the use of heat resistance is not a good plastic lamp holder, plastic parts are likely to impose such a long time high temperature conditions, has been softened. The use of metal lamp, relatively speaking, easier to meet this test conditions, but also need to take into account the solid connection between the degree of metal lamp with LED fluorescent lamp body and creepage distance and electrical gap.
led 1w fluorescent lamp at the screw plays a connection between the lamp and the lamp body with a fixed role. At present, the common LED fluorescent lamp at the screw diameter is less than 3mm, in accordance with the provisions of the GB7000.1 of such screw screwed into the metal. Is common practice, LED fluorescent lamp uses the aluminum casing, the screw is screwed directly to metal shell, which would also meet the requirements. A common problem is that the resulting screw screwed into the metal casing, screws and lamp charged metal parts too close, easily lead to climb the power distance and electrical gap failed.
LED fluorescent internal wiring for connecting the input and output of the lamp latch and built-in power supply, built-in power and aluminum casing through the casing to isolate. Insulation between internal live parts and metal parts can be touched the GB7000.1 provisions, shall meet the double insulation or reinforced insulation. This requires that the casing of insulation required to meet the electric strength of reinforced insulation class requirements.
Second, the internal wiring
According to the the GB7000.1 standard requirements, led power 10w fluorescent lamp used in internal wiring needs assessment is the diameter and thickness of the insulation, mechanical damage, heat insulation temperature, and insulation meet the requirements of the four aspects. In general, the internal cable protection from mechanical damage does not have a problem, the main problem will be out in the other three aspects. In accordance with the GB7000.1 requirements of the standard normal current is less than 2A (general LED fluorescent lamp current does not exceed 2A), the internal conductor nominal cross-sectional area of not less than 0.4mm2, the insulating layer of thickness not less than 0.5mm. And from the insulation point of view, the aluminum shell belongs to the accessible metal parts, with aluminum case internal basic insulation not in direct contact, which requires internal wires need for double insulated wire, unless the relevant certificates to prove that the wire insulation to meet strengthen insulation requirements, when the internal line use of single-layer insulated wire is also possible. LED fluorescent lamp on the market today use internal line rarely at the same time taking into account the cross-sectional area, the thickness of the insulating layer and the insulated wire level requirements.
In addition, the internal conductors in alignment, but also need to pay attention to avoid the wire and the internal power supply to heat the larger parts in direct contact, such as transformers, filter inductors, bridge rectifiers, heat sinks, etc., because these components in led power 50w fluorescent lights work, the temperature is may exceed the heat resistance temperature of the internal wire insulation material. Internal conductor traces exposure to heat large parts, to avoid insulating layer of insulation caused by local overheating damage, resulting in security issues such as leakage or short circuit.