Basic requirements for leakage circuit breaker protection (RCBO) Split Meter Ready Board Box

In the process of investigation and pilot, some branch lines were slightly adjusted, and some leakage circuit breaker Split Meter Ready Board Boxes of different specifications were installed, and some lessons and experiences were obtained. According to the application, the following basic requirements are put forward for the Split Meter Ready Board Box of leakage circuit breaker.

Box material

New composite materials with high-performance flame retardant PC as the main raw material should be used. The material has good mechanical strength, high insulation performance, flame retardancy, resistance to corrosion of acid and alkali and other media, no cracking and deformation in the environment of -40 ℃ ~ +70 ℃, long maintenance free cycle, and can be maintained in the field for more than 10 years without aging, cracking and deformation.

Overall dimension of box

Considering that the Split Meter Ready Board Box of leakage circuit breaker is hung on the pole for a long time, the height of the box must be limited so that electricians can easily get on the pole. For this reason, we think the appropriate height should not exceed 550 mm.

Installation method and requirements

The protection Split Meter Ready Board Box generally adopts the combination device of residual current protection device and air circuit breaker or residual current circuit breaker. In case of failure, it must be closed manually. In this way, it is required that the height of the leakage circuit breaker Split Meter Ready Board Box installed on the pole should not be too high, generally 1.5 ~ 2 m. At the same time, such an installation height should not be in the form of cantilever installation, but should be close to the pole as much as possible, which can reduce the hidden danger of pedestrian unintentional collision with the box. Therefore, the installation method can be hoop type, close to the pole.

Requirements for residual current protection device performance

The residual current protection device installed in the leakage circuit breaker protection Split Meter Ready Board Box must pass 3C certification and spot check the qualified products. It must be a time-delay residual current protection device, and its action current value and delay time should be able to coordinate with the total protection, which should ensure that the residual current protection device at the end (fast type) will not act after the residual current protection device (fast type) acts.