**230.24 Clearances. **Service-drop conductors shall not be
readily accessible and shall comply with 230.24(A) through
(D) for services not over 600 volts, nominal.
**(A) Above Roofs. **Conductors shall have a vertical clearance
of not less than 2.5 m (8 ft) above the roof surface.
The vertical clearance above the roof level shall be maintained
for a distance of not less than 900 mm (3 ft) in all
directions from the edge of the roof.
*Exception No. 1: The area above a roof surface subject to
pedestrian or vehicular traffýc shall have a vertical clearance
from the roof surface in accordance with the clearance
requirements of 230.24(B).
Exception No. 2: Where the voltage between conductors
does not exceed 300 and the roof has a slope of 100 mm
(4 in.) in 300 mm (12 in.), or greater, a reduction in clearance
to 900 mm (3 ft) shall be permitted.
Exception No. 3: Where the voltage between conductors
does not exceed 300, a reduction in clearance above only
the overhanging portion of the roof to not less than 450 mm
(18 in.) shall be permitted if (1) not more than 1.8 m (6 ft)
of service-drop conductors, 1.2 m (4 ft) horizontally, pass
above the roof overhang, and (2) they are terminated at a
through-the-roof raceway or approved support.
*FPN: See 230.28 for mast supports.
*Exception No. 4: The requirement for maintaining the vertical
clearance 900 mm (3 ft) from the edge of the roof shall
not apply to the final conductor span where the service
drop is attached to the side of a building.