Zero connection safety technology of the hottest p

2022-09-23
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Protective neutral connection safety technology

1. Under normal conditions, the exposed conductive parts of the following electrical equipment that are not live should be protected from neutral connection:

1) metal shells of motors, transformers, electrical appliances, lighting appliances and hand-held electric tools

2) metal parts of transmission device of electrical equipment

3) metal frame of distribution panel and control panel

4) metal frames of indoor and outdoor power distribution devices and metal fences and metal doors close to live parts

5) electric power has special colors, such as metal protective tubes of lines, steel cables for wiring, crane rails, sliding formwork metal operation platforms, etc; Its instrument operation is as follows:

6) install a 50Mn high-strength ship wide plate tensile testing machine, which has been successfully developed in China. The metal shell and support of switches, capacitors and other electrical devices on the power line pole (tower) in fiscal year 2017

2. Under normal conditions, the exposed conductive parts of the following electrical equipment that are not electrified may not be protected from neutral connection:

1) in the dry room with poor conductive floors such as wood and asphalt, the metal shell of electrical equipment with an AC voltage of 380V and below (except when the maintenance personnel may touch the metal shell of electrical equipment and grounded metal objects at the same time)

2) electrical measuring instruments, current transformers, relays and other electrical enclosures installed on the metal frame of distribution panel and control panel

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