Specifications - State of Delaware

SECTION 264100 - LIGHTNING PROTECTION SYSTEMS: continued
clamps, splicers, and other components required for a complete system that meets UL 96A
standards.
1. Type of metal for air terminals and cables: copper. Provide 24-inch long, 1/2- and
5/8-inch solid copper air terminals, copper lightning protection cable with a minimum
strand size #13 AWG, minimum total cross sectional area of 192,000 CM and minimum
weight of 190 lbs/1,000 feet (unless indicated otherwise).
2. Air terminals for roof mounting: Provide units with bases that shall be attached with
adhesive provided by electrical contractor. The adhesive shall be approved by the roof
membrane manufacturer. Air terminals on the metal roofs shall have mounting hardware
compatible with the roof.
3. Ground rods: 3/4-inch minimum diameter by 10 feet long, copper clad steel with a
minimum of 27% of the rod weight in the copper cladding.
4. Conductor supports shall be attached with adhesive provided by electrical contractor to
the roof. The adhesive shall be approved by the roof membrane manufacturer.
Conductor supports on the metal roofs shall have mounting hardware compatible with the
roof.
5. Provide bonding conductors as required by NFPA 780.
PART 3 - EXECUTION
3.01 INSTALLATION OF LIGHTNING PROTECTION SYSTEMS:
A. Install lightning protection systems as indicated, in accordance with Equipment manufacturer's
written instructions, and in compliance with applicable installation standards specified above.
Suitably protect cable and air terminals from damage during construction.
B. Install conductors with direct paths from air terminals to ground connections avoiding sharp
bends (minimum radius = 8 inches and no bend shall be less than 90 degrees) and narrow
loops. Where indicated, run conductors in nonmetallic PVC raceway, Schedule 40, with a
minimum elbow radius of 8 inches.
C. Air terminals shall be installed within 2 feet of all ends, edges, and corners of the building.
D. Splices and Clamps: Install cable with as few joints as possible. Use approved exothermic
welded connections for all underground conductor splices and all underground connections
between conductors and ground rods. Use approved mechanical compression connections for
all above grade connections.
E. Provide Bimetallic Connectors when joining copper to aluminum conductors.
F. Ground Rods:
1. Install rods as indicated by driving and not by drilling or jetting.
2. Drive rods into unexcavated portion of the earth where possible.
3. Where rods must be installed in excavated areas, drive rods into earth after compaction of
backfill is completed.
4. Drive to a depth such that top of rod will be approximately 18 inches below final grade,
or subgrade, and connect to main grid ground cable.
3.02 CORROSION PROTECTION:
A. Use no combination of materials that may form an electrolytic couple of such nature that
corrosion is accelerated in the presence of moisture, unless moisture is permanently excluded
from the junction of such metals. Where unusual conditions exist that would cause
deterioration or corrosion of conductors, use conductors with suitable protective coatings.
Protect cable at all points where cable leaves concrete by wrapping rubber tape on 2 inches
either side of the plane formed by the finished concrete surface.
264100-2 DEAN264100.DOC