Outline

XL-21 Type low voltage power distribution cabinet is applicable to power station and industrial and mining enterprise, used for  power distribution in three-phase four-wire or three-phase five-wire system with AC 500V and below. It is installed indoors and near  the wall. Repair before shield. Shell is bent with steel plate. Knife switch operation handle is installed to the upside of right column  of cabinet front, can be used for switching power. Choose different types and circuit breakers with different current grades to user's  specific requirements.

Use environmental conditions

◆ Ambient temperature:-50℃ ~+40℃ , and the average temperature within 24 hours shall not exceed+36℃ ;  

◆ Altitude: no more than 2000 m; 

◆ Relative humidity: not more than 50% when ambient air humidity is+40 ℃ ; Under lower humidity, it can have higher relative  humidity (e.g.:+20℃ is 90%). Considering the change of temperature, it is allowed to produce moderate frost: 

◆ The inclination of the equipment to the vertical plane shall not exceed 5 during installation, and the equipment shall be installed  in a place free from severe vibration, impact and corrosion.

Use, maintenance and overhaul

After the power distribution box is installed or overhauled, the following inspections and tests shall be carried out before it is put  into operation (the inspections and tests after overhaul depend on the quality of overhaul).  

◆ Check whether the electrical equipment and secondary wiring installed inside the power distribution cabinet meet the drawing  requirements.  

◆ Check whether the knife switch and air switch used for operation are flexible, and there should be no sticking and rolling pattern.  

◆ Check whether the electrical equipment installed has good contact and meets the use requirements of the electrical equipment  itself.  

◆ Check whether there are any other foreign matters in the power distribution cabinet and whether the strong screws in each part  are loose.