At the back of the cable tray a non-combustible calcium silicate board shall be mounted with a density 870 ± 50 kg/m3 and a thickness of 11 ± 2 mm. This board can be mounted in two parts.
Kaablirenni taha tuleb paigaldada mittesüttiv kaltsiumsilikaadist plaat tihedusega 870 ± 50 kg/m3 ja paksusega 11 ± 2 mm. Plaadi võib paigaldada kahes osas.