Image 3 of 5 of governmental <a href="//commons.wikimedia.org/wiki/Fire_test" title="Fire test">fire test</a> in <a href="//commons.wikimedia.org/wiki/Sweden" class="mw-redirect" title="Sweden">Sweden</a>. This small fire house was loaded with cable trays full of cables. These were connected between the floors, causing cable penetrations between fire compartments. When the penetrants were installed, the government invited their local <a href="//commons.wikimedia.org/wiki/Firestop" title="Firestop">firestop</a> manufacturers to install their products. Kindling was placed below the trays. These kindling blocks were set on fire. The fire quickly engulfed all trays. Results were mixed. An enormous amount of smoke was generated before the fire was extinguished. Trays twisted and buckled.
<a href="//commons.wikimedia.org/wiki/User:Achim_Hering" title="User:Achim Hering">Achim Hering</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>