Company Foss successfully finished circuit integrity tests of their own fibre optic cables DB4678 with CPR rating B2ca, s1 a0 d1

From the security point of view the structured optical cabling is evaluated only by the so called CPR classification – more details can be found in following article: https://www.fossfibreoptics.com/sk/sk/news-foss-standard-eu-cpr-cables The currently most strict class is B2ca, s1, a0, d1. CPR classification describes the performance of the cables during the fire from the fire propagation point of view, as well as the aggressivity of the generated smoke (smoke acidity) and volume of the falling burning droplets from the cable. More information about the CPR classification can be found on following link: https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32006D0751&qid=1654675523923&from=EN

However, the CPR does not specify the functional resistance of the cable – so called circuit integrity – the ability of the cable itself to transmit the data once burning. This is needed in some specific applications:

Evacuation broadcasting
CCTV systems in tunnels
Supervising and control system in critical infrastructures as Nuclear Power Plants, petrochemical industry, or traffic infrastructure

Where is necessary to control certain critical systems or to shut down properly certain activities to avoid further damage on the infrastructure as well as to save human lives.

In the past the circuit integrity shall be evaluated based on the ISO/IEC 60331 criteria. This standard is not complex to cover the latest requirement from the industry, therefore new requirement was introduced – specifically the STN 920205, ČSN 73 0895 or DIN 4102-12.

Foss successfully certified the fibre optic cable with the CPR classification B2ca, s1, a0, d1 according to STN 92 0205, ČSN 73 0895, DIN 4102-12 respectively on the support construction OBO Bettermann, in certified laboratories PAVUS (www.pavus.cz) and Fires (www.fires.sk). Fibre optic cables were tested according to all temperature curves described by above mentioned standards: