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3.2.3.20.(2)
OP3
ObjectiveOP3 Protection of Adjacent Buildings from Fire
Attribution
Application
Application 1: 
Fire separations between buildings connected by an underground walkway and the walkway.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to buildings to which Part 9 applies, as stated in Sentence 9.10.1.2.(1).
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Intent
Intent 1: 
To supersede the requirements of Sentence 3.2.3.19.(1) and require an increased minimum fire-resistance rating of 1 h [as opposed to 45 min] for the separation of buildings connected by underground walkways, on the basis that underground walkways pose greater difficulties to emergency responders [e.g. result in delays and ineffectiveness in fire suppression operations]. This increased minimum fire-resistance rating is to limit the probability of the spread of fire from one building to the adjacent building connected by means of the walkway, which could lead to damage to the connected building.
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