FAQ

We often talk about IEC standard fireproof cables. Fireproof refers to testing the circuit integrity of cables during

combustion. The IEC series of fireproof standards and their simple differences are as follows:

First, let's look at IEC 60331-21, IEC 60331-23, IEC 60331-25. Among them, IEC 60331-21 is mainly suitable for

testing power control cables with rated voltages of 0.6/1.0 KV and below, IEC 60331-23 is mainly suitable for

data and communication cables with rated voltages not exceeding 110V, and IEC 60331-25 is mainly suitable for

testing optical cables.

The burning time of this series is 90 minutes and the flame temperature is 750 degrees.

Secondly, the test standards that cable testing will also encounter are IEC 60331-1, IEC 60331-2, and IEC

60331-3. These three standards are all applicable to cables with rated voltages of 0.6/1.0 KV and below. The

difference is that Part 1 applies to cables with a total cable diameter exceeding 20mm, Part 2 applies to cables

with a total cable diameter not exceeding 20mm, and Part 3 applies to cables with a diameter not exceeding

20mm and fire tests conducted in metal tubes.

The combustion time of this series is divided into four levels: 30, 60, 90, and 120 minutes. The flame

temperature is not less than 830 degrees and impact vibration is applied.