Specifications

Draper Prison Wasatch & Oquirrh Intercom & Paging System Remodel 4-21-2014
GROUNDING AND BONDING FOR COMMUNICATIONS SYSTEMS 270526 - 5
3.3 APPLICATION
A. Conductors: Install solid conductor for No. 8 AWG and smaller and stranded conductors for
No. 6 AWG and larger unless otherwise indicated.
1. The bonding conductors between the TGB and structural steel of steel-frame buildings
shall not be smaller than No. 6 AWG.
2. The bonding conductors between the TMGB and structural steel of steel-frame buildings
shall not be smaller than No. 6 AWG.
B. Conductor Terminations and Connections:
1. Pipe and Equipment Grounding Conductor Terminations: Bolted connectors.
2. Underground Connections: Welded connectors except at test wells and as otherwise
indicated.
3. Connections to Ground Rods at Test Wells: Bolted connectors.
4. Connections to Structural Steel: Welded connectors.
C. Conductor Support:
1. Secure grounding and bonding conductors at intervals of not less than 36 inches ((900
mm).)
D. Grounding and Bonding Conductors:
1. Install in the straightest and shortest route between the origination and termination point,
and no longer than required. The bend radius shall not be smaller than eight times the
diameter of the conductor. No one bend may exceed 90 degrees.
2. Install without splices.
3. Support at not more than 36-inch (900-mm) intervals.
4. Install grounding and bonding conductors in 3/4-inch (21-mm) PVC conduit until conduit
enters a telecommunications room. The grounding and bonding conductor pathway
through a plenum shall be in EMT. Conductors shall not be installed in EMT unless
otherwise indicated.
a. If a grounding and bonding conductor is installed in ferrous metallic conduit, bond
the conductor to the conduit using a grounding bushing that complies with
requirements in Section 270528 "Pathways for Communications Systems," and
bond both ends of the conduit to a TGB.
3.4 GROUNDING BUSBARS
A. Indicate locations of grounding busbars on Drawings. Install busbars horizontally, on insulated
spacers 2 inches (50 mm) minimum from wall, 12 inches (300 mm) above finished floor unless
otherwise indicated.
B. Where indicated on both sides of doorways, route bus up to top of door frame, across top of
doorway, and down; connect to horizontal bus.
Bid DA14027DFCM
5/30/2014 2:08 PM p. 95