final bid specs 09328.pdf - Freese and Nichols, Inc.

3.00 EXECUTION
3.01 INSTALLATION
A. The Contract Drawings (shop drawings) shall indicate the extent and general arrangement of
the lightning protection system. If any departures from the Contract Drawings (shop
drawings) are deemed necessary by the Contractor, details of such departures and the
reasons therefore shall be submitted to the Engineer for approval. No such departures shall
be made without the prior written approval of the Engineer. Lightning protection systems for
all applications shall conform to National Fire Protection Association Code No. 780 and the
NEC, whichever is more stringent.
B. Installation shall be performed by a certified master installer. Installer shall provide an
Underwriters' Laboratories Master Label for the facilities.
C. Air terminals shall be provided on the highest projections and at intervals not exceeding 20
feet along the perimeter top surface. Air terminals shall extend at least 10 inches above the
object or area that they are intended to protect. Air terminals shall be connected to the
lightning protection system when so specifically authorized by the Engineer.
D. Roof and down conductors shall be stranded and shall meet the requirements given in NFPA
780. Roof and down conductors shall maintain a horizontal or downward course. No bend in
a roof or down conductor shall form an included angle of less than 90 degrees, nor shall it
have a bend radius of less than eight inches. Conductors shall be routed external to buildings
and six feet or more from power or signal conductors. Down conductors shall be routed
outside of any structure and shall not penetrate or invade that structure. All down conductors
except one may be provided with a screw type connector as described in UL 96 where
lightning protection system testing may be required. Down connectors shall be supported
from and secured to the building exterior using one hole straps of copper or bronze at
maximum intervals of three feet.
E. Guards shall be provided for down conductors located in or next to driveways, walkways or
other areas where they may be displaced or damaged. Guards shall extend at least six feet
above and one foot below grade level. Guards shall be metal pipe. Metal guards shall be
bonded to the down conductor at both ends. Bonding jumpers shall be of the same size as
the down conductor. Crimp type fittings shall not be used.
F. Metallic bodies, on or below roof level, that are subject to induced charges from lightning
include exhaust fans, radio towers, HVAC units, ladders, railings, antennas, roof drains,
plumbing, vents, metal coping, metal flashing, gutters, downspouts, small metal wall vents,
door and window frames, metal balcony railings, and in general any isolated metallic body
within six feet of an exposed lightning protection system element. When these metallic
bodies have a metal thickness of 3/16 inch or greater, they shall be bonded to the nearest
main lightning protection system conductor with UL approved fittings and conductors meeting
the requirements of NFPA 780. These bonding fittings shall provide surfaces of not less than
three square inches. Provisions shall be made to prevent corrosive effects introduced by
galvanic action of dissimilar metals at bonding points. If the metal parts of these units are
less than 3/16 inch thick, additional approved air terminals, conductors and fittings, providing
a two way path to ground from the air terminals shall be installed.
G. If metallic, the mast of roof mounted antennas and obstruction lightning shall be bonded to the
nearest roof or down conductor using UL approved fittings and conductors. The bonding
jumpers shall be of the same size and material as the roof or down conductor to which they
are connected. Provide two paths for ground.
Lightning Protection For Structures 26 41 13-3
DRP09328