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This study uses a metal stud partition fireproof drywall measuring 83 mm in thickness as a test specimen to explore the impact of an embedded junction box on the firefighting performance of the wall through one time of standard fire test on a 300 cm × 300 cm area and five times of standard fire test on a 120 cm × 120 cm area.  The results show that the quality of calcium silicate board plays a big role in the fireproof effectiveness.  The embedded junction box located on the backside of the fire can reduce the effectiveness of the wall, especially the area above the socket.  The thickness of rock wool may increase the performance, but in a limited rate.  External junction box may not impact the fireproofing performance of the wall but it still possesses some safety risks.  An embedded junction box measuring 101 × 55 mm could already damage the fire compartment, and in reality there may be more complicated situations that should be noted and improved

The Performance of Calcium Silicate Board Partition Fireproof Drywall Assembly with Junction Box under Fire