What should you pay attention to when installing low-voltage electrical appliances?

Low-voltage electrical appliances generally consist of electromagnetic devices, contact systems and arc extinguishing devices. Among them, the electromagnetic mechanism is a sensing component of an electrical component, which can convert electromagnetic energy into mechanical energy and drive the contact to close or open. Under normal circumstances, the electromagnetic mechanism adopts the form of an electromagnet, which is composed of an electromagnetic coil, a static iron core (iron core), a moving iron core (armature), etc., wherein the moving iron core is connected with a movable contact holder. The contact system acts as an execution component and opens and closes the contact to open and close the circuit. Arc refers to the instant that the contact is closed and disconnected (including when the melt is melted). It will generate an arc-shaped spark from the electron flow in the contact gap. This spark caused by electrical causes is called an arc.

Low-voltage electrical equipment works in 50Hz or 60Hz, rated voltage 1200V and below, or DC voltage 1500V and below circuits.

Pay attention to the following issues when installing low voltage appliances:

(1) Vertical installation: Low-voltage electrical appliances should be installed vertically, especially oil-immersed decompression starters. In order to avoid that the insulating oil overflows the fuel tank, the angle of inclination must not exceed 5 degrees. It is recommended to use bolts to avoid welding. The installation position should be easy to operate, and the distance between the handle and the surrounding buildings must be maintained to avoid being damaged.

(2) Avoid places with severe vibration: Low-voltage electrical appliances should be installed in places where there is no severe vibration, and have a proper height from the ground. Knife switches, load switches, and other power cords must be connected to fixed contacts. Never connect a power cord to the knife switch. Floor-mounted low-voltage electrical appliances. The bottom should be 100mm above the ground. On the surface of the low-voltage electrical installation, indicate the name of the installation equipment and the loop number or path.

(3) Grounding: The metal housing or metal bracket of the low voltage appliance must be grounded (or connected to zero). The bare part of the appliance shall also be provided with a protective cover. The double- knife switch shall be provided with a device to prevent self-closing.

(4) Anti-combustion, explosion-proof and rain-proof: In the workshops with inflammable and explosive gas or dust, the electrical appliances should be sealed and installed outdoors, and there must be rainproof measures. Explosion-proof electrical appliances must be used in places with explosion hazards. In order to avoid unnecessary trouble.

(5) Contact inspection: When using, the surfaces of the electrical contacts should be kept clean, smooth and in good contact. The contacts should have enough pressure, the actions of each phase contact should be consistent, and the arc extinguishing device must be kept intact.

(6) Remove the oil layer: Before use, the protective oil layer on each contact surface should be removed. Before putting it into operation, it should be operated several times to check the operation condition.

The above is the precautions for low-voltage electrical installation, we must pay attention to the production and life