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electrical structure of the explosion-proof lamp (2)

Datetime: 2018-12-18 17:22:17

5. External and internal lines

1 The external conductor of the luminaire shall be a copper core wire covered by an insulating layer, and its nominal cross-sectional area shall not be less than 1 mm2. 2 The inner conductor shall be an insulated copper core wire with a nominal cross-sectional area of not less than 0.5 mm2.

3 wire connections and wiring are not allowed to withstand mechanical stress, allowing connection by any of the following methods;

A can prevent loose bolts or screw connections;

B squeeze connection;

The C wire is first mechanically connected and then soldered;

D brazed connection;

E Fusion welded connection.

When the 4 wire passes through the hard material, the entrance should be inverted to make it smooth, and the minimum radius is

0.5mm to prevent scratching the wire insulation.

The insulation of the 5 wires should be able to withstand the high voltage and maximum temperature that may be generated during normal use. The casing can be used to protect the hot spots to ensure that the lamps will not be damaged due to damage after the lamps are properly installed and connected.

6 Lamp current-carrying parts shall be made of copper, at least 50% of copper containing alloys or materials of at least the same properties.

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6. Clearance and creepage distance

1 The electrical clearance between the charged parts of different polarities in the light source cavity is not less than 3mm, the creepage distance is not less than 3mm, the clearance between the live parts and the adjacent conductive parts is not less than 3mm, and the creepage distance is not less than 4mm.

7. Insulation material

1 insulation. The insulating materials used in explosion-proof luminaires should have low hygroscopicity and good insulation properties.

2 heat resistant. The insulating material shall be able to withstand heat resistance tests without softening and deforming. The temperature of the heat test is 25 °C higher than the operating temperature of the relevant component measured during normal operation. The insulation of the component in which the live parts are fixed is at least 125 ° C. The test temperature of the other components is at least 75 ° C.

3 resistant to burning and anti-open flames. The insulating material of the fixed live parts shall be able to withstand the needle flame test, and the test flame shall be applied to the sample for 10 s. After removing the test flame, the self-sustaining combustion time should not exceed 30. Insulating materials that are not fixed with live parts shall be subjected to a glow wire test at 650 ° C and extinguished within 30 s after removal of the glow wire.

4 resistance to electric marks. Insulating materials in contact with live parts shall be made of insulating materials with a level of resistance not less than d, so as to avoid current leakage too easily along the surface of the insulating material, breakdown...