3.5.1 For equipment class 3, cables for redundant
equipment or systems should not be routed together through the same
compartments. Where this is unavoidable such cables could run together
in cable ducts of A-60 class, the termination of the ducts included,
which are effectively protected from all fire hazards, except that
represented by the cables themselves. Cable connection boxes are not
allowed in such ducts.
3.5.2 For equipment class 2, piping systems for
fuel, lubrication, hydraulic oil, cooling water and cables should
be located with due regard to fire hazards and mechanical damage.
3.5.3 For equipment class 3, redundant piping
system (i.e. piping for fuel, cooling water, lubrication oil, hydraulic
oil, etc.) should not be routed together through the same compartments.
Where this is unavoidable, such pipes could run together in ducts
of A-60 class, the termination of the ducts included, which are effectively
protected from all fire hazards, except that represented by the pipes
themselves.