Specifications

Draper Prison Wasatch & Oquirrh Intercom & Paging System Remodel 4-21-2014
GROUNDING AND BONDING FOR COMMUNICATIONS SYSTEMS 270526 - 3
4. Bonding Cable: 28 kcmils (14.2 sq. mm), 14 strands of No. 17 AWG conductor, and 1/4
inch (6.3 mm) in diameter.
5. Bonding Conductor: No. 4 or No. 6 AWG, stranded conductor.
6. Bonding Jumper: Tinned-copper tape, braided conductors terminated with two-hole
copper ferrules; 1-5/8 inches (41 mm) wide and 1/16 inch (1.6 mm) thick.
2.3 CONNECTORS
A. Irreversible connectors listed for the purpose. Listed by an NRTL as complying with NFPA 70
for specific types, sizes, and combinations of conductors and other items connected. Comply
with UL 486A-486B.
B. Compression Wire Connectors: Crimp-and-compress connectors that bond to the conductor
when the connector is compressed around the conductor. Comply with UL 467.
1. Electroplated tinned copper, C and H shaped.
C. Signal Reference Grid Connectors: Combination of compression wire connectors, access floor
grounding clamps, bronze U-bolt grounding clamps, and copper split-bolt connectors, designed
for the purpose.
D. Busbar Connectors: Cast silicon bronze, solderless compression-type, mechanical connector;
with a long barrel and two holes spaced on 5/8- or 1-inch (15.8- or 25.4-mm) centers for a two-
bolt connection to the busbar.
E. Welded Connectors: Exothermic-welding kits of types recommended by kit manufacturer for
materials being joined and installation conditions.
2.4 GROUNDING BUSBARS
A. TMGB: Predrilled, wall-mounted, rectangular bars of hard-drawn solid copper, 1/4 by 4 inches
(6.3 by 100 mm)] in cross section, length as indicated on Drawings. The busbar shall be NRTL
listed for use as TMGB and shall comply with J-STD-607-A.
1. Predrilling shall be with holes for use with lugs specified in this Section.
2. Mounting Hardware: Stand-off brackets that provide a 4-inch ((100-mm))clearance to
access the rear of the busbar. Brackets and bolts shall be stainless steel.
3. Stand-off insulators for mounting shall be Lexan or PVC. Comply with UL 891 for use in
600-V switchboards, impulse tested at 5000 V.
B. TGB: Predrilled rectangular bars of hard-drawn solid copper, 1/4 by 2 inches (6.3 by 50
mm)]in cross section, length as indicated on Drawings. The busbar shall be for wall mounting,
shall be NRTL listed as complying with UL 467, and shall comply with J-STD-607-A.
1. Predrilling shall be with holes for use with lugs specified in this Section.
2. Mounting Hardware: Stand-off brackets that provide at least a 2-inch ((50-mm) clearance
to access the rear of the busbar. Brackets and bolts shall be stainless steel.)
3. Stand-off insulators for mounting shall be Lexan or PVC. Comply with UL 891 for use in
600-V switchboards, impulse tested at 5000 V.
Bid DA14027DFCM
5/30/2014 2:08 PM p. 93