SSH EN 50290-2-27:2021

Communication cables - Part 2-27: Common design rules and construction - Halogen free polyolefin based sheathing compounds for cables having improved flame and fire properties (HFFR)

Scope

This document gives specific requirements for halogen free polyolefin based sheathing compounds used for halogen free communication cables with improved characteristics in the case of fire.
Compounds, described by this document, are commonly also named HFFR or HFFR-LS (halogen free, flame/fire retardant, low smoke), see also EN 50290 2 20.
It is expected to be read in conjunction with EN 50290 2 20, the product standards EN 50288 series, EN 60794 series and other applicable product standards.
Improved characteristics in the case of fire are demonstrated by specific fire tests on cables for flame/fire retardant applications (e.g. single or bunched cable fire test). Additional tests to prove the characteristics in case of fire, e.g. such as smoke emission test, might also be part of the dedicated product standard or specification.
This document describes the compound types as given in Table 1.
Table 1 — Sheathing compounds
Compound grades Max. operating temperature Comment
Type 1 70°C thermoplastic standard
Type 2 90°C thermoplastic, higher temperature
Type 3 90°C crosslinked, higher temperature