Source: https://www.scribd.com/doc/156928331/16452-Grounding
Timestamp: 2017-03-24 08:28:29
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BrowseInterestsStay InformedCareerPersonal GrowthFiction & BiographiesHealth & FitnessLifestyleCultureBrowse byBooksAudiobooksNews & MagazinesSheet MusicBrowse allUploadSign inJoinSECTION 16452 GROUNDING 00000000PART 1 - GENERAL 1.1 DESCRIPTION: A. B. 1.2 The Work shall consist of furnishing and installation of the grounding system as shown on the drawings and specified herein. This work shall include grounding for power and grounding for telecommunication.
REFERENCES: A. SASO – Saudi Arabian Standards Organization SASO 981-986 SASO 1270 Electrical installations of buildings (all parts) Electrical installations of buildings: Part 5: Selection and erection of electrical equipment - Chapter 54: Earthing arrangements and protective conductors. Earthing electrodes Methods of testing earthing electrodes Electrical installations of buildings - Part 7: Requirements for special installation or locations - Section 707: Earthing requirements for the installation of data Protection of structures against lightning - Part 1: General principles - Section 1: Guide A. Section of protection levels for lightning protection systems
SASO 1486 SASO 1487 SASO 1357
SASO 1614
IEC - International Electro-technical Commission IEC 60364 IEC 60364-5-54 Electrical installations of buildings (all parts) Earthing arrangement and protective conductors
NFPA - National Fire Protection Association NFPA 70 NFPA 780 National Electrical Code Lightning Protection Code
UL - Underwriters Laboratories, Inc. UL 467 UL 486A Electrical Grounding and Bonding Equipment Wiring connectors and Soldering Lugs for With Copper Conductors
16452-1
QUALITY ASSURANCE: A. Test Reports: Certified test reports of ground resistance. IEC and IEE Regulations for Electrical Installations.
Wire Connectors for Use With Aluminum Conductors Service Equipment
1.1 MATERIALS: A.5 mm² (AWG 12). bare stranded copper wire conforming to IEC 228. or insulated stranded copper wire conductor cable.
BS – British Standards Institute BS 6651 BS 7671 Protection of Structures against lightning IEE Wiring Regulations
G. and Earth Surface
F.PRODUCTS 2. Ground Impedance. Telecommunication Grounding shall follow TIA/EIA J-STD-607-A. The grounding cable shall have a minimum section in accordance with SASO. latest edition and other applicable Codes and Standards specified herein.
16452-2
SUBMITTALS: A.
TIA/EIA TIA/EIA J-STD-607-A Commercial Building Grounding and Bonding Requirements for Telecommunications
1. as shown on the drawings. Ground cables shall be soft drawn. Product Data and Material Samples. Materials and equipment together with method of installation shall comply in all respects with SASO. IEC or NEC 250 and in no case smaller than 2.UL 486B UL 869 E.
PART 2 . Shop Drawings: Showing the location of system grounding electrode connections and the routing of grounding electrode conductor. GROUND CABLE: 1.
B.Institute of Electrical and Electronics Engineers IEEE 81 Guide for Measuring Earth Resistivity.
duronze or silicon bronze. Ground rods shall be driven with a cap and driven stud. 2.
B. 1.EXECUTION 3. 19 mm diameter rods. Bolted connections shall be of the multiple bolt type. providing an independent current return path of low resistance to ground sources. ground rods shall be copper cladded steel with high strength steel core and electrolytic-grade copper outer sheath.
C. everdur.1 GENERAL REQUIREMENTS: A. This point shall be at the service entrance which is the main low voltage power panel.
Unless otherwise indicated on Drawings. TNS SYSTEM
C. vertical and parallel. Diagonal runs shall be avoided.
PART 3 .1. The complete grounding system shall be mechanically and electrically continuous and of durable construction. these should be protected by painting over with a moisture resisting bituminous paint or compound. Ground conductors shall be laid with slack and buried to a minimum depth of 600 mm below grade. washers and stop nuts shall be of high copper alloy.
3. 1. welding or brazing. and securely fastened to the mounting surface without slack using galvanized malleable iron straps.
As shown on Drawings. or by wrapping with a protective tape to exclude moisture. All parts of the grounding system shall be protected against damage during construction.
Splices and Taps:
. B.00 meters length. grounding system outside building shall be TNC system and inside building shall be TNS system.
D. The ground conductors shall be laid with slack and buried to a minimum depth of 600 mm below grade. Ground rods shall be driven with a cap driving stud. The runs shall be horizontal.2
GROUND RODS AND GROUND CABLE: A. TNS system should have only one point which is directly connected to earth. From that point the neutral and the protective earth conductors must be separated and not be mixed together at any point of the secondary distribution system. durium. Exposed grounding conductors shall follow the contours of the surface over which they pass. furnished in 3. Ferrous hardware will not be accepted. C. Ground conductors shall not be embedded in equipment foundations. molten welded to core. Where connections between dissimilar metals must be made. Tees and straight through joints in copper strip should be made either by riveting and sweating. All ground cable shall be carefully handled when installed to avoid kinking or cutting the conductors. Bolts..
grilles. Molds shall not be used to make more than the maximum number of joints recommended by manufacturer. size as shown on the drawings. IEC 60364-5-54 or NEC Article 250 for sizes and quantities of equipment ground conductors.
Conductors shall contain a minimum number of splices throughout each run.4
EQUIPMENT GROUNDING: A. panel board. All welded joints shall be checked and inspected by the Engineer before being covered.5
GROUNDING OF VARIOUS METAL COMPONENTS A. Ground continuity conductors other than metallic conduits. except where larger sizes or more conductors are indicated.
3. trunking and cable armor shall consist of a special green colored insulated copper conductor.
2. or when otherwise unsuitable for further service. splices and taps shall be made by the exothermicweld process. Non-conductive protective coatings such as paint or enamel on the conduits or fittings shall be removed from the threads or contacts surfaces before attaching grounding connection. Equipment grounding shall consist of connecting all non-current carrying metallic parts of the electrical mechanical installation to the grounding sources.
3. Particular care shall be taken to use the correct size and type of mold and size of cartridge for each combination of conductors. transformers/switchgear. The instructions of manufacturer shall be obtained and followed in welding connections.3
TERMINAL CONNECTIONS: A. Computer and other electronic and communication equipment shall be grounded to an equipment earth which will be run separately to the building ground and will be connected to the main ground bar. Ground connections to piping shall generally be welded or brazed. Where a cross connection is required. suspended ceiling grids. Connections of cable to ground rod shall also be exothermic-welded. protecting or shielding electrical equipment from direct access by unauthorized personnel.
D. Grounding conductors.1. Ground all extraneous metalwork such as steel structure. concrete reinforcement.
B. All equipment grounding connections shall be tapped from the applicable ground/source.
C. The series grounding of one piece of equipment to another will not be permitted. All ground cables shall be thoroughly cleaned with wire brush at connections before welding. it shall be made with two T-connections spaced not less than 457 mm apart. outlet boxes. and other electrical equipment. enclosures. Non-current carrying metallic parts of the electrical installation shall include such items as metal conduits. ducting. doors.
16452-4 Grounding System
. barriers and other metal components of building.
3. Comply with SASO 1270. raceways.
E. After ground connection is attached. any exposed bare-metal shall be covered again with a coating matching the original coating. exposed metal parts of apparatus. cabinets. Connections of ground conductors to conduits shall be made with copper clamps or straps or by grounding bushings. piping.
16452-5 Grounding System
. Grounding Equalizer (GE) a. The sizing and drilling of the busbar shall follow the details as indicated in TIA/EIA J-STD-607-A and as shown in the detail drawing. 2. Busbar shall be factory predrilled.7
GROUNDING OF MOTORS: A.
3. Telecommunication Bonding Backbone (TBB) connecting all TMGB and TGB. b. Telecommunication Busbar (TGB) for every Telecommunication room.6
GROUNDING CONDUCTOR: A. Sizes shall be as per SASO 1270. d.8
TELECOMMUNICATION GROUNDING A. 3. 4. 5. Telecommunication Main Grounding Busbar (TMGB) for the main Telecommunication room and entrance room. Sizing of the telecommunication Bonding Backbone (TBB) shall follow the TIA/ EIA J-STD-607-A as follows: TBB Length (mm) 4-6 6-8 8-10 10-13 13-16 16-20 Greater than ~20 c. TBB Size (mm²) 16 25 35 35 50 50 95
All materials of busbar and conductors shall be copper. If this is not feasible.3. IEC 60364-5-54 or as shown on the drawings
3. A separate green-yellow colored insulated grounding conductor shall be installed in all conduits and raceways. Minimum size for telecommunication wire in copper 6 mm². All telecommunication rooms shall be interconnected with a complete system of grounding wires and grounding busbar including: 1. Conductor can be insulated with green color. Motors shall be grounded by connecting a green-yellow colored conductor from a grounding bushing in the starter or isolating switch to the motor frame. Bonding conductor to metallic parts and to main electrical grounding busbar. the grounding conductor shall be extended through an insulated bushed opening in the connection box and connected to the motor base. The conductor shall be run together with the circuit wiring and terminated in the motor connection box provided the latter is mechanically connected to the frame.
Upon completion of the entire grounding system of the site. END OF SECTION
B. If test measurements exceed this value. Contractor shall measure the ground resistance at a location designated by the Engineer. the Contractor shall install and connect additional ground rods as directed by the Engineer until this value is obtained. Measurement shall be made with ground tester. An acceptable grounding resistance shall not be more than 3 ohm computer equipment and 5 ohms for general building grounding. All measurements and tests shall be witnessed by the Engineer.
16452-6
. including all necessary connections and backfilling.
Contractor shall measure the ground resistance of the ground well of the completely driven ground rod at each location before connecting it to the ground grid.A.
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