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NFPA 502 (2014 edition), 12.1.2 (2), is it about all kind of fire barrier systems? Not necessary concrete?

Question asked by cesar.perez on May 9, 2017

We have 2 questions.

We have a tunnel project with the circuits within the fire protection barrier (fire protection material in celling) and we need to know if the method is “circuit with fire barrier system”, equivalent “embedded in concrete”, then 2 hours protection needed.

Also, we have de doubt about if 12.1.2 (4) “diversity in system routing” would be able to use one tube for routing the electrical feeding of the other tube and vice versa, or if this case is external routing.

Looking forward to your answers!