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W[ E " R ^ d $k ek 0 k P_ p p # p e p 1 e d I L 6 D) , I I I :k :k % v I I I k ! ! ! ! p I I I I I I I I I : SECTION 27 05 26 grounding and bonding FOR COMMUNICATIONS systems
GENERAL
RELATED DOCUMENTS
Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.
Specifications throughout all Divisions of the Project Manual are directly applicable to this Section, and this Section is directly applicable to them.
REFERENCE STANDARDS and codes
Refer to Section 27 00 00.
Scope
It is the Contractors responsibility to install and commission Grounding and Bonding for all Communications installations.
The MTGB in the Equipment Room or TGB in the Telecommunications Rooms will be provided by the electrical contractor.
PRODUCTS
General
All materials shall meet or exceed all applicable referenced standards, federal, state and local requirements, and conform to codes and ordinances of authorities having jurisdiction.
submittals
Refer to Section 27 00 00.
wall-mount busbars
Telecommunications Main Grounding Busbar (TMGB)
Telecommunications Main Grounding Busbar (TMGB) shall be constructed of 0.25 inches (6.4 mm) thick solid copper bar.
The busbar shall be 4 inches (100 mm) high and 12 inches (300 mm) long and shall have 18 attachment points (two rows of 9 each) for two-hole grounding lugs.
The hole pattern for attaching grounding lugs shall meet the requirements of ANSI-J-STD 607-A and shall accept 15 lugs with 5/8 inch (15. 8 mm) hole centers and 3 lugs with 1 inch (25.4 mm) hole centers.
The busbar shall include wall-mount stand-off brackets, assembly screws and insulators creating a 4 inch (100 mm) standoff from the wall.
The busbar shall be UL Listed as grounding and bonding equipment.
Telecommunications Grounding Busbar (TGB)
Telecommunications Grounding Busbar (TGB) shall be constructed of 0.25 inch (6.4 mm) thick solid copper bar.
The busbar shall be 2 inch (50 mm) high and 10 inch (250 mm) long and shall have 7 attachment points (one row) for two-hole grounding lugs.
The hole pattern for attaching grounding lugs shall meet the requirements of ANSI-J-STD 607-A and shall accept 4 lugs with 5/8 inch (15.8 mm) hole centers and 3 lugs with 1 inch (25.4 mm) hole centers.
The busbar shall include wall-mount stand-off brackets, assembly screws and insulators creating a 4 inch (100 mm) standoff from the wall.
The busbar shall be UL Listed as grounding and bonding equipment.
Bonding accessories
Compression Lugs
Compression lugs shall be manufactured from electroplated tinned copper.
Compression lugs shall have two holes spaced on 5/8 inch (15.8 mm) or 1 inch (25.4 mm) centers, as stated below, to allow secure two bolt connections to busbars.
Compression lugs shall be sized to fit a specific size conductor, sizes #6 to 4/0, as stated below.
Compression lugs shall be UL Listed as wire connectors.
EXECUTION
INSTALLATION
Wall-Mount Busbars
Attach busbars to the wall with appropriate hardware according to the manufacturers installation instructions.
Conductor connections to the TMGB or TGB shall be made with 2-Hole Bolt-On Compression Lugs sized to fit the busbar and the conductors.
Each lug shall be attached with stainless steel hardware after preparing the bond according to manufacturer recommendations and treating the bonding surface on the busbar with antioxidant to help prevent corrosion at the bond.
The wall-mount busbar shall be bonded to ground as part of the overall Telecommunications Bonding and Grounding System.
Ground Terminal Block
Every rack and cabinet shall be bonded to the TMGB or TGB.
Minimum bonding connection to racks and cabinets shall be made with a rack-mount 2-hole ground terminal block sized to fit the conductor and rack and installed according to manufacturer recommendations.
Remove paint between rack/cabinet and terminal block, clean surface and use antioxidant between the rack and the terminal block to help prevent corrosion at the bond.
Bonding to the metal frame of a building
All bonding conductors and connectors for bonding the metal frame of a building shall be listed for the purpose intended and approved by a NRTL.
In buildings where metal frames (structural steel) are effectively grounded, each TGB shall be bonded to the metal frame within the room using a No. 6 AWG conductor.
Where the metal frame is external to the room and readily accessible the metal frame should be bonded to the TGB with a No. 6 AWG conductor.
Where the metal frame is external to the room and readily accessible the metal frame should be bonded to the TMGB with a No. 6 AWG conductor.
When practicable because of shorter distances and other considerations, and where horizontal steel members are permanently electrically bonded to vertical column members, TGB's may be bonded to these horizontal members in lieu of the vertical column members.
This Standard does not require the steel bars of a reinforced concrete building to be bonded to the TGB or TBB.
Testing
The Telecommunications Ground and Bonding System shall be tested with an Earth Ground Resistance Tester used in the Two Point Test Method.
The following will be needed to test the grounding and bonding.
An Earth Ground Resistance Tester with the attachments.
All testing should be done with the entire building in operation. Nothing needs to be shut down to test the grounding and bonding with this tester.
If the resistance value is less than 0.1 Ohm between the two test points the bonding is adequate.
Tests to be conducted:
The installer / technician conducting these tests must be certified
Test between the TMGB and the service equipment (power) ground.
Test between the TMGB and each TGB in the system.
Test between the TGB and:
Data racks.
Cable tray.
Telecommunication conduit.
Caging.
Electronic equipment.
Tests shall be conducted with the systems in operation.
Tests shall be recorded and submitted to the Owners Representative.
END OF SECTION 27 05 26
MD ANDERSON Project No. XX-XXXXMD ANDERSON Project NameA/E NameIssue DescriptionA/E Project No.Month, 00, 0000
鶹ӳgrounding and bonding FOR COMMUNICATIONS systems MD Anderson Cancer Center27 05 26 MS060310 PAGE 1 of NUMPAGES 1
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