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Reasons for Conducting the Fire Safety Tests

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Reasons for Conducting the Fire Safety Tests

Author: Date :2019-07-12 Views: order
The testing that is reported in this Interim Report was conducted in response to questions that arose during the development of the Cal Fire OSFM (Office of State Fire Marshall) Solar Photovoltaic Installation Guidelines. These questions were restated during discussions held in San Jose, CA on 20 March 2008 between members of the California Solar Energy Industries Association (CALSEIA) and Underwriters Laboratories (UL).
 
CALSEIA requested the meeting to discuss three areas of concern that CALSEIA members had with UL listing requirements or documents. The three areas of concern were listing requirements for various mounting brackets, the need to develop new testing and listing for grounding lugs, and specific language about fire rating for roofs with rack mounted PV arrays contained in the UL Guide information referenced in the 2007 UL White Book.
 
Regarding the fire rating issue, the language of concern was:
Installation of modules on or integral to a building’s roof system may adversely affect the roof-covering materials’ resistance to external fire exposure if the module has a lesser or no fire-resistance rating. Roof-covering materials will not be adversely affected when the modules have an equal or greater fire-resistance rating than the roof-covering material.
 
CALSEIA noted that fire officials had raised concern over the ambiguity in this statement with regard to the most common residential PV roof installation, Class C PV modules mounted over Class A rated roofs. This illuminated the fact that there was a lack of fire test results on systems including PV modules in roof-mounted configurations. Industry representatives requested that UL work to bring clarity to this concern.
 
In response, UL changed the language of the Guide Card as follows:Installation of modules on or integral to a building’s roof system may or may not adversely affect the roof-covering materials’ resistance to external fire exposure if the module has a lesser or no fire-resistance rating. Roof-covering materials will not be adversely affected when the modules have an equal or greater fire-resistance rating than the roof-covering material.
 
UL also agreed that additional testing was necessary to fully address the concerns expressed by fire officials and CALSEIA. Though roof covering materials and PV modules both receive fire class ratings, little work had been done to investigate the interactions that may occur between them when burning materials or flame are imposed on systems comprised of PV mounted in stand-off configuration over roofing systems. Specifically,it was necessary to investigate whether and how PV modules with Class B or C fire ratings may degrade the fire-resistance properties of Class A rated roofing systems using standard flammability test procedures and methods in a qualified laboratory. With funding from the U.S. Department of Energy, UL and the Solar ABCs developed a test plan to answer these questions.

 

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