Proposed Changes Shown with Strikeout / Underline
84.4 Clearances
F. Below,
alongside, through or in Immediate Proximity to Bridges, Viaducts or Similar
Structures
Open wire
communication conductors which cross below, through or in immediate proximity
to bridges, viaducts, or similar structures shall be maintained at clearances
above ground and walkways as specified in Table 1, Cases 1 to 6; at a radial
clearance from unprotected conductors of other classifications of not less than
as specified in Table 2, Case 3; at clearances from walls and the underside of
such structures as specified in Table 1, Case 7. The horizontal clearance (Table 1, Case
7) shall be maintained until the vertical clearance (Table 1, Case 6) is
attained (see Figure 84–4 5). Where
it is not practicable to obtain the 3 foot clearance
this clearance may be reduced to not less than 6 inches where the voltage does
not exceed 160 volts; or where supported on the walls or underside of such
structures at clearances as specified in Table 1, Case 9 with supports at
least every 50 feet.
Proposed Final
84.4 Clearances
F. Below,
alongside, through or in Immediate Proximity to Bridges, Viaducts or Similar
Structures
Open wire
communication conductors which cross below, through or in immediate proximity
to bridges, viaducts, or similar structures shall be maintained at clearances
above ground and walkways as specified in Table 1, Cases 1 to 6; at a radial
clearance from unprotected conductors of other classifications of not less than
as specified in Table 2, Case 3; at clearances from walls and the underside of
such structures as specified in Table 1, Case 7. The horizontal clearance (Table 1, Case
7) shall be maintained until the vertical clearance (Table 1, Case 6) is
attained (see Figure 84–5). Where
it is not practicable to obtain the 3 foot clearance
this clearance may be reduced to not less than 6 inches where the voltage does
not exceed 160 volts; or where supported on the walls or underside of such
structures at clearances as specified in Table 1, Case 9 with
supports at least every 50 feet.