Electrical clearance in LV distribution box

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1、 What is the electrical clearance and its creepage distance

  1. Electrical clearance is the space between two components or between components and safety protection page of machine and equipment. That is to say, under the premise of maintaining the stability and safety of electrical equipment characteristics, the route of the insulating layer can be achieved according to the gas.
  2. The creepage distance is based on the path fault (the current does not pass through the high-power electrical appliances and connect the switching power supply) between the two components measured along the surface of the insulation layer or between the electronic components and the safety protection page of the machine and equipment. In other words, under different conditions, the insulating layer material (resin material) around the electric conductor is metal electrode, which may cause the insulating layer material to show inductive electrification, that is, creepage distance.

2、 Effect of electric clearance and creepage distance:

In simple terms, the electrical clearance and creepage distance inside the low-voltage distribution box are actually the two main parameters related to the electrical insulation layer. In the application of industrial control products such as automotive relays and power switches, in addition to following relevant specifications, appropriate electrical distance and creepage distance should be set to maintain the stability of their electrical characteristics.

3、 Index value of bare charged body:

The electrical clearance between the bare electrified body with different bottom pressure metal meter box and its shell shall be greater than 20 mm, and the electrical clearance between the bare electrified body in the control circuit and the metal products of the grounding device shall be greater than 20 mm. When the bus duct spacing is less than 20 mm, the insulation layer shall be bound, and the spacing shall be in accordance with the following requirements:

4、 FAQ:

  1. Move parts to make them in a bad position;
  2. The creepage distance value is greater than the electrical clearance value.

It seems that the simple distribution box actually has a lot of knowledge. It is not easy to install the components in the box. The proper installation method can make the application time of electrical service life profitable, and reduce the common electrical faults profitably.

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