Choice of circuit breaker and cable current

Release date: 2024/9/18 14:54:47 | Publisher: Shenzhen Cptele Electronics Co., Ltd

 

Circuit breaker or cable first? Many agents and builders criticize the cable cross-sectional area given by the design institute as too large, but in fact, the design institute is correct.

1. To be precise, choose the switch, circuit breaker first, and then the cable. Correct method: cable current carrying capacity > = rated capacity of circuit breaker > = load calculation continuous current

2. Most of the practices of our data center and UPS industry, the three are calculated and selected separately, which is actually wrong. If the "load calculation current< conductor rated carrying current < circuit breaker capacity" is encountered, the current carrying capacity of the cable should be greater than the rated breaking capacity of the circuit breaker, and the circuit breaker is used as an effective breaking point. Otherwise, the cables have already begun to burn, and the circuit breaker has no action protection, which will form a great electrical hazard.
Coptic wire, when it comes to cable selection, has a number of proven solutions.

 

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