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 either water spray or water jet protocols.
Annex D provides, as an option, the flame temperature of 1 000 °C, which is applicable for special applications.
Requirements are stated for an identification that can optionally be marked on the cable to signify compliance with this document.
This group safety publication focusing on the test method for circuit integrity safety for power cables of rated voltage higher than 1 kV up to and including 30 kV under fire conditions, is primarily intended to be used as a product safety standard for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products similar to those mentioned in the scope of this group safety publication, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.
One of the responsibilities of a TC is, wherever applicable, to make use of either BSPs or GSPs, or both, in the preparation of its publications.
WARNING – The test given in this document can involve the use of dangerous voltages and temperatures. Suitable precautions should be taken against the risk of shock, burning, fire and explosion that can arise, and against any noxious fumes that can be produced.