<a href="//commons.wikimedia.org/wiki/Fire_test" title="Fire test">Fire test</a> preparation leading to <a href="https://en.wikipedia.org/wiki/en:Certification_listing#Firestop_Configuration_C" class="extiw" title="w:en:Certification listing">UL firestop listing C-AJ-8073</a>. Firestop mortar is first applied in the hardest to reach area: between the cables inside the cable tray.
<a href="//commons.wikimedia.org/wiki/User:Achim_Hering" title="User:Achim Hering">Achim Hering</a>
2007-06-25
<span class="int-own-work" lang="en">Own work</span>