Fire alarm circuits in duct bank

[ralphcirclel]

I am installing class A circuits between bldgs. in pvc , with concrete cover . Is the 48 inch spacing required between the outgoing and return circuits , in this case?
Ralphcirclel

 

[luckylerado]

I am installing class A circuits between bldgs. in pvc , with concrete cover . Is the 48 inch spacing required between the outgoing and return circuits , in this case?
Ralphcirclel

Yes.