HALOGEN FREE OR LOW SMOKE & FUME MATERIALS

As outlined in the previous subject certain cable types are designed with the performance capability of surviving fire conditions for a specified period, whilst other cable types may be manufactured using polymer compounds that generate lower smoke and fume emissions.

In such cases the cables may be identified as being Halogen Free, Low Smoke & Fume (LSF), Low Smoke Zero Halogen (LSZH), or Zero Halogen Low Smoke (ZHLS).

These compare favourably with traditional electric cables that were likely to generate noxious emissions of gases in fire situations, that may have been manufactured and installed many years ago, prior to the introduction of the most recent cable standards and the development of new environmentally friendly compounds.

It is equally important that the materials used in the manufacture of cable management products, including cable cleats, cable clamps cable glands, their seals, and any shrouds that are required to be fitted, can offer the same high level of compliance in the way of lower smoke and fume emissions.

Some cables, but not all, that bear Low Smoke & Fume and /or Zero Halogen characteristics may have an inner cable bedding that is extruded from a compound which has not been fully cured during the manufacturing process. This is often referred to as a soft bedding, and this itself brings an additional factor to consider when selecting appropriate cable sealing glands to suit cables having this characteristic.