File:T ratings oldest trick in the book 005.png
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English: Innards of a bus duct, complete with double Mylar wrappings of each individual flatbar (bus bar). In the fire test leading to UL Through-Penetration Firestop Listing C-BJ-8028, the plastic wrappings, as well as the hollow plastic tube spacers that keep bus bar sandwiches apart, caught on fire. Since no firestop was permitted inside of the bus duct, this resulted in live fire going through the fire barrier on the inside of the bus duct. Internal firestops have to be included in the electrical testing to UL857 to be approved for use. But without the internal firestops, live fire and a steady stream of heat and smoke go through fire barriers and into adjacent fire compartments. Adhering to the electrical code, violates the building code.
Deutsch: Innenleben einer amerikanischen Stromschiene. Die einzelnen "Flachstähle", oder Leiter, entweder aus Aluminium oder Kupfer, sind mit Plastik (Mylar) umwickelt. Dies ist bis zu 130°C geprüft, was Kokolores ist, da Brandprüfungen um die 1100°C laufen. Diese Stromschiene kam bei einer Brandprüfung als Durchbruch zum Einsatz. Dies resultierte in der bauaufsichtlichen Zulassung UL Abschottungssystem C-BJ-8028. Eine innere Abschottung wurde seitens des Prüflabors verboten, da man sonst die elektrische Zulassung der Stromschiene gemäß UL857 verletzen würde. Das Plastik brennt selbstverständlich sehr gut. Durch Einhaltung elektrischer Vorschriften wird also gegen die generelle Bauvorschrift verstoßen, da in diesem Fall Feuer, Hitze und Rauch innen durch die Stromschiene durchgehen an der äußeren Abschottung vorbei und weiter in die abgewandte Seite. Einhaltung der Elektrovorschrift verstößt gegen die Bauvorschrift. |
| Date | |
| Source | Own work |
| Author | Achim Hering |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 01:48, 29 September 2015 | | 18,673 × 27,768 (6.6 MB) | wikimediacommons>Achim Hering | {{Information |Description ={{en|1=Innards of a bus duct, complete with double Mylar wrappings of each individual flatbar (bus bar). In the fire test leading to [http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/showpage.html?name=XHEZ.C-BJ-... |
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