Tests for electric cables under fire conditions – Circuit integrity – Part 4: Test method for fire with shock at a temperature of at least 830 °C for cables of rated voltage higher than 1 kV up to and including 30 kV

IEC 60331-4:2024 specifies the test apparatus and procedure, and gives the performance requirements, including recommended flame application times and flame temperatures, for power cables of rated voltage higher than 0,6/1,0 kV up to and including 18/30 kV for maintaining circuit integrity when subject to fire and mechanical shock under specified conditions.

The test method in this document is restricted to conductor sizes up to and including 120 mm2. The test results for 120 mm2 size conductors constructions qualify larger cross-sections of the same cable construction.

In the case of preassembled three-core cables, then the complete cable is considered as tested when a complete single-core of the cable has been tested.

This document includes details for the specific point of failure, continuity checking arrangement, test sample, test procedure and test report relevant to electric power cables with a rated voltage higher than 0,6/1,0 kV up to and including 18/30 kV.

Annex A provides the method of verification of the burner and control system used for the test.

Annex B provides a choice of the recommended test apparatus.

Annex C provides, as an option, guidance for using eithe