Three principles for selecting flame-retardant cables

Flame-retardant cable refers to a cable in which the sample is burned under specified test conditions, and after removing the test source, the spread of the flame is only within a limited range, and the residual flame or burn can be extinguished on its own within a limited time.

Class A: Non-metallic content 7L/m, supplied for 40 minutes (GB/T 18380.33-2008);

Class B: Non-metallic content of 3.5L/m, supplied for 40 minutes (GB/T 18380.34-2008);

Class C: Non-metallic content 1.5L/m, supplied for 20 minutes (GB/T 18380.35-2008);

Class D: Non-metallic content 0.5L/m, supplied for 20 minutes (GB/T 18380.36-2008);

Below, the Jinko Cable editor will introduce three principles for selecting flame-retardant cables, hoping to be helpful to you.

1. Firstly, the volume and weight of non-metallic materials in wires or cables should be calculated, and the flame-retardant category should be selected based on the initial flame-retardant definition.

2. Flame-retardant cables must indicate their flame-retardant rating. If not specified, they are assumed to be Class C.

3. Due to the current regulation that the non-metallic content of A-class flame-retardant cables when bundled and laid shall not exceed 7L/m, for cables with larger cross-sections, this regulation is exceeded by just a few cables. At present, it is solved by dividing it into several cable bundles for laying or installing longitudinal partitions in cable trays.

It should be pointed out that this is a principle for selecting expression methods. We look forward to the release of the selection criteria for the second method (involving combustion performance, droplet level, smoke toxicity level, and corrosiveness level).