Distribution box quality appraisal

"Distribution box", also called distribution cabinet, is the collective name for motor control center. The distribution box is a low-voltage power distribution device that assembles switching equipment, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or screen according to electrical wiring requirements.
is easy to manage and is helpful for maintenance when a circuit failure occurs. Distribution boxes, distribution cabinets, distribution panels, etc. are complete sets of devices that centrally install switches, instruments and other equipment.
In the case of distribution box quality appraisal, Zhongke Testing can provide distribution box quality appraisal services.

1,
distribution box according to appearance: The box that distributes electric energy is called a distribution box.
power distribution cabinet: The floor-standing box that distributes electric energy is also called a cabinet. The standard name is "box", but to distinguish the floor-standing larger power or control device, it is sometimes called a "cabinet".
2, divided by structure type
(1) Fixed panel switch cabinet, the model code is often called a switch board or distribution panel.
(2) protective (i.e. closed) switch cabinet.
(3) drawer type switch cabinet.

YD/T 3990-2021 Comprehensive distribution box for micro base station
TB/T 1528.5-2018 Railway signaling power system equipment Part 5: Input distribution box
DL/T 1441-2015 Technical conditions for intelligent low-voltage distribution box
JB/T 11626-2013 Electrical equipment for combustible dust environments Electrical equipment protected by enclosure and limited surface temperature Dust explosion-proof lighting (power) distribution box
JB/T 6749-2013 Electrical equipment for explosive environments Explosion-proof lighting (power) distribution box
DL/T 375-2010 General technical conditions for outdoor distribution boxes
CB/T 1046-1992 Marine distribution box
CB/T 3575-1994 Technical requirements for repair of ship distribution box

A fire accident occurred in a community. The property management company believed that the control system of the distribution box provided by the electrical appliance company was short-circuited, causing a fire in the power supply cable. The two parties argued and took the case to court.
was entrusted by the court to conduct an appraisal and analysis on whether the "distribution box" involved in the case was the cause of the fire accident.
identification and analysis results: The
expert group conducted discussions and comprehensive technical analysis based on the relevant information of the "distribution box" involved in the case provided by the client, the on-site investigation and inspection results, and the sampling inspection results, and made the following identification and analysis opinions:
According to the results of on-site inspection and physical evidence analysis, the fire accident was caused by a short circuit in the B-phase and C-phase wires connected between the residual current electrical appliance fire monitoring system and the branch circuit breaker in the AP-02 distribution box of the high-voltage well on the second underground floor of the 10# building, resulting in the sequential short circuit of some lines and equipment on the power supply side. It shows that the fire accident was indeed caused by internal causes of the distribution box.