FAQ

As people's requirements for safety factors increase and their awareness of preventing unknown events

increases, fire-resistant cables are increasingly appearing in infrastructure projects. Today we will discuss fire

resistant standards. There are many relevant standards in the industry, so what are the commonly used

standards? What is the difference between them?

First, let's understand the two fire protection standards that are often mentioned in overseas projects, namely

BS6387 CWZ and IEC 60331-21. The C in BS6387 CWZ means that the flame temperature is 950 degrees

Celsius and burns for 180 minutes, that is, three hours; while the flame temperature of IEC 60331-21 is 750

degrees Celsius and burns for 90 minutes. In addition, the W in BS6387 CWZ refers to the spray test: that is, a

flame of 650 degrees Celsius is applied and sprayed for 15 minutes at the same time; Z refers to mechanical

vibration, that is, a flame of 950 degrees Celsius is applied and the mechanical impact equipment is started and

vibrated continuously for 15 minutes. The spray and mechanical vibration tests are not required by IEC 60331-

21, and the BS6387 CWZ standard is stricter than IEC 60331-21 in terms of flame temperature and burning

time.