0 1 0 2 , 7 0 r e b m e t p e S
September 07, 2010
TRANSMISSION MATERIALS STANDARD SPECIFICATION
10-TMSS-05, Rev. 01
TABLE OF CONTENTS
1.0
SCOPE
2.0
CROSS REFERENCES
3.0
APPLICABLE CODES AND STANDARDS
4.0
DESIGN AND CONSTRUCTION REQUIREMENTS 4.1 4.2 4.3 4.4 4.5 4.6 4.7
General Ratings Materials Fabrication Diameter and Permissible Variations Reel Design Markings
5.0
TESTS
6.0
DATA SCHEDULE
10TMSS05R01/MSO
Date of Approval: September 07, 2010
PAGE NO. 2 OF 11
TRANSMISSION MATERIALS STANDARD SPECIFICATION
1.0
10-TMSS-05, Rev. 01
SCOPE This Transmission Material Standard Specification (TMSS) specifies the minimum technical requirements for design, engineering, manufacture, inspection, testing and performance of Bare Copper-Clad Steel Grounding Conductor and Ground Rod intended to be used for the grounding of transmission line structures in the Transmission System of Saudi Electricity Company (SEC), Saudi Arabia.
2.0
CROSS REFERENCES This Material Standard Specification shall be read in conjunction with the latest revision of SEC General Specification No. 01-TMSS-01, titled "General Requirements for All Equipment/Materials" which shall be considered as an integral part of this TMSS. This TMSS shall also be read in conjunction with SEC Purchase Order or Contract Schedules for project, as applicable.
3.0
APPLICABLE CODES AND STANDARDS The latest amendments/revision of the following Code and Standard shall be applicable for the equipment/material covered in this TMSS. In case of conflict, the vendor/manufacturer may propose equipment/material conforming to Industry Code and Standard other than that quoted hereunder without jeopardizing the requirements of this TMSS. ASTM B910/B910M Standard Specification for Annealed Copper-Clad Steel Wire
4.0
DESIGN AND CONSTRUCTION REQUIREMENTS 4.1
General 4.1.1
The copper-clad steel grounding conductor and copper-clad steel ground rods shall be of manufacturer's standard design and shall meet or exceed the requirements of this Specification in all respects.
4.1.2
The copper-clad steel grounding conductor shall be made from bare round annealed copper-clad steel wires conforming to ASTM B910/B910M.
4.1.3
The service conditions referenced in 01-TMSS-01 shall be regarded as the basis of design criteria.
4.1.4
Manufacturer's drawings, as required in 01-TMSS-01 shall show the outline of the copper-clad steel grounding conductor and copper-clad steel ground rod together with all pertinent dimensions. Any variations in these dimensions due to manufacturing tolerances shall be indicated.
10TMSS05R01/MSO
Date of Approval: September 07, 2010
PAGE NO. 3 OF 11
TRANSMISSION MATERIALS STANDARD SPECIFICATION
4.2
10-TMSS-05, Rev. 01
Ratings 4.2.1
The copper-clad steel grounding conductor shall conform to the requirements of Table 01 below: Table 01: Ratings and characteristics of copper-clad steel grounding conductor
Conductor Size Designation
Nominal Diameter Overall
AWG 7 No. 10 7 No. 9 7 No. 8 7 No. 7 7 No. 6 7 No. 5 7 No. 4 19 No. 8 19 No. 7 19 No. 6 19 No. 5
(mm) 7.77 8.71 9.78 11.00 12.34 13.87 15.57 16.31 18.31 20.57 23.11
Nominal Total Individual Cross-Section Wire (mm) 2.588 2.906 3.264 3.665 4.115 4.620 5.189 3.264 3.665 4.115 4.620
(mm²) 36.83 46.44 58.57 73.87 93.10 117.42 148.04 158.97 200.45 252.71 318.71
Minimum Rated Tensile Strength (kN) 9.15 11.5 14.54 18.34 23.13 29.14 36.77 39.45 49.79 62.77 79.10
Max. DC Resistance at 20°C (Ohm/km) 1.244 0.9865 0.7820 0.6202 0.4920 0.3903 0.3094 0.2892 0.2294 0.1819 0.1443
Notes: i. The maximum DC Resistance at 20oC value is based on minimum individual wire diameter and minimum conductivity of 39.21 % corresponding to a resistivity of 0.0440 ohm mm 2/m.
4.3
ii.
The tensile load is taken as ninety percent (90%) of the sum of the tensile loads of the individual wires and is based on minimum tensile strength of 276 N/mm2 as referred in ASTM B910/B910M.
4.2.2
The required size and diameter of copper-clad steel grounding conductor shall be specified in the Data Schedule.
4.2.3
The copper-clad steel ground rods shall have a nominal diameter of 16mm (5/8 inches) and 19mm (3/4 inches) with a minimum length of 3 meter. The ground rods shall be of sectional type equipped with suitable couplings and driving studs. The required diameter of the ground rod shall be specified in the Data Schedule.
Materials 4.3.1
10TMSS05R01/MSO
The copper-clad wire shall consist of a core of homogeneous open-hearth, electric-furnace, or basic-oxygen steel with a continuous outer cladding of copper thoroughly bonded to the core throughout. The copper-clad wire shall be free from copper discontinuities and all imperfections not consistent with good commercial practice.
Date of Approval: September 07, 2010
PAGE NO. 4 OF 11
TRANSMISSION MATERIALS STANDARD SPECIFICATION
4.4
4.5
10-TMSS-05, Rev. 01
4.3.2
The nominal conductivity of copper-clad steel wire shall be 40% IACS (International Annealed Copper Standard).
4.3.3
The electrical resistivity of copper-clad steel wire at a temperature of 20ºC shall not exceed 0.0440 ohm mm2/m.
4.3.4
All wires in the grounding conductor shall be of the same grade and quality.
4.3.5
The ground rods shall be made from high-strength steel (high carbon steel). Pure electrolytic copper shall be uniformly molecularly bonded onto the core to ensure corrosion resistance and eliminate electrolytic action. The steel core shall have sufficient rigidity for easy driving with hammer or mechanical drivers.
Fabrication 4.4.1
The copper-clad steel grounding conductors shall be constructed in conventional concentric-lay-stranded type.
4.4.2
The copper-clad steel grounding conductors shall have left-hand lay and the preferred lay is 13.5 times the diameter of that layer, but the pitch of the strand shall be neither less than 10 nor more than 16 times this diameter.
4.4.3
All copper-clad steel wires in the conductor shall lie naturally in their true positions in the completed conductor. They shall remain in position when the conductor is cut at any point and shall permit re-stranding by hand after being forcibly unraveled at the end of the conductor.
4.4.4
Joints or splices may be made in the finished individual copper-clad steel wires composing concentric- lay-stranded conductor but these splices shall not decrease the strength of the finished conductor below the minimum breaking strength specified in Table 01.
4.4.5
These joints or splices shall not be closer than 15 meters to any other joint in the same layer in the conductor.
4.4.6
The type of joints or splices in individual copper-clad steel wires shall be of weld-annealed joints made by electric butt welding.
Diameter and Permissible Variations 4.5.1
The actual diameter of the copper-clad steel wires forming the conductor shall not vary from the specified diameter by more than ± 1.5% expressed to the nearest 0.003 mm.
4.5.2
The cross sectional area of the completed conductor shall not be less than 98% of the area specified. The cross sectional area of a conductor shall be considered to be the sum of the cross-sectional areas of its component wires at any section when measured perpendicularly to their individual axis.
10TMSS05R01/MSO
Date of Approval: September 07, 2010
PAGE NO. 5 OF 11
TRANSMISSION MATERIALS STANDARD SPECIFICATION
4.5.3
10-TMSS-05, Rev. 01
The minimum copper thickness due to eccentricity shall not be less than 5% of the individual wire diameter (10% of the wire radius) as shown in Table 02: Table 02: Minimum copper thickness Nominal Individual Wire Diameter (mm) 2.588 2.906 3.264 3.665 4.115 4.620 5.189
4.6
4.5.4
The minimum thickness of copper for copper-clad steel ground rod shall not be less than 0.25 mm at any point.
4.5.5
The actual diameter of the copper-clad steel ground rod shall not be less than 14.3mm and 17.1mm (unthreaded) for 16mm and 19mm nominal diameter ground rods respectively.
Reel Design 4.6.1 4.6.2
4.7
Minimum Copper Thickness (mm) 0.1294 0.1453 0.1632 0.1832 0.2057 0.2310 0.2594
Reel shall be of non-returnable wood. The length of copper-clad steel grounding conductor per reel shall be 2000 meters with a permissible variation of ±5%, unless otherwise different lengths are required as per actual site requirements or as agreed between SEC and the manufacturer.
Markings 4.7.1
Each end of the copper-clad steel grounding conductor in the reel shall bear a non-corroding tag identifying the following: a. b. c. d. e.
4.7.2
Each reel shall be stenciled to show all information under paragraph 4.7.1 plus additional information as follows: a. b.
10TMSS05R01/MSO
Grade of grounding conductor Diameter/Size of grounding conductor Average Breaking Strength Length of grounding conductor (on the one end only) Stranding
Manufacturer's Name and Country of Origin Year of Manufacture Date of Approval: September 07, 2010
PAGE NO. 6 OF 11
TRANSMISSION MATERIALS STANDARD SPECIFICATION
c. d. e. f. g. h. i. j. 4.7.3
5.0
10-TMSS-05, Rev. 01
Serial Number Size of Reel Gross Weight SEC Purchase Order Number/Contract Number. SEC Material Item Number Consignee Address Direction of Rolling 10-TMSS-05, Rev.0
All markings shall appear on both sides of the reel.
TESTS All test results shall be provided for review and acceptance by SEC. 5.1
Tests for electrical and physical properties of copper-clad steel wires composing concentric-lay-stranded conductors made from copper-clad steel wire shall be made before stranding.
5.2
The routine test shall not be required after stranding.
5.3
The copper-clad steel wire shall withstand without fracture not less than 20 torsions in a length equivalent to 100 times the nominal diameter of the specimen. The specimen shall be twisted by rotating on the wires at a rate of approximately 15 twists per minute in the same direction until fracture occurs.
5.4
The copper-clad steel wire after twisting to destruction shall not reveal any seams, pits, slivers or other imperfection of sufficient magnitude to indicate inherent defects or imperfections. Examination of the wire at the break with the unaided eye shall show no separation of the copper from the steel.
5.5
The electrical resistivity of the material shall be determined in accordance with ASTM B193 Test Method for Resistivity of Electrical Conductor Materials.
5.6
Elongation shall be measured by means of an extensometer suitable for measuring elongation in 250 mm in accordance with the testing requirements specified in ASTM B910/B910M. It shall be attached to the test specimen at a tension load of approximately ten percent (10%) of rated strength, and shall be recorded as zero length. The elongation shall be observed while applying tension load to the specimen and the reading shall be taken when fracture occurs. The elongation of the specimen shall be not less than fifteen percent (15%). The tests shall be disregarded, if the fracture occurs in or at the gripping jaws of the machine and the extensometer shows a reading less than fifteen percent (15%).
10TMSS05R01/MSO
Date of Approval: September 07, 2010
PAGE NO. 7 OF 11
TRANSMISSION MATERIALS STANDARD SPECIFICATION
5.7
10-TMSS-05, Rev. 01
If upon testing a sample from any reel of wire, the results do not conform to the tensile requirements prescribed in Table 1 and the elongation of specimen in Clause 5.6, two additional samples shall be tested and the average of the two tests shall determine the acceptance or rejection of the reel of wire.
10TMSS05R01/MSO
Date of Approval: September 07, 2010
PAGE NO. 8 OF 11
TRANSMISSION MATERIALS STANDARD SPECIFICATION
6.0
10-TMSS-05, Rev. 01
DATA SCHEDULE
BARE COPPER-CLAD STEEL GROUNDING CONDUCTOR AND GROUND ROD SEC Enquiry No.
Date:
SEC Purchase Order No. or Contract No.
Date:
SEC PTS No./Project Title with J.O. No. REFERENCE SECTION NO. 3.0
DESCRIPTION
'A'
'B'
'C'
APPLICABLE CODES AND STANDARDS ASTM B910/B910M
*
4.0
DESIGN AND CONSTRUCTION REQUIREMENTS
4.2.2
Copper-Clad Steel Grounding Conductor AWG Size Nominal Cross-Section (mm²) Overall Diameter (mm) Minimum Tensile Strength (kN)
*
D.C. Resistance at 20°C ( Ω/km)
*
'A'- SEC SPECIFIED DATA/PARAMETERS 'B'- BIDDER/SUPPLIER/VENDOR/CONTRACTOR PROPOSED DATA/PARAMETERS 'C'- REMARKS SUPPORTING THE PROPOSED DEVIATION IN COLUMN 'B' (*)- DATA/PARAMETERS TO BE PROVIDED/PROPOSED BY THE BIDDER/SUPPLIER/ VENDOR/CONTRACTOR IN COLUMN 'B'
10TMSS05R01/MSO
Date of Approval: September 07, 2010
PAGE NO. 9 OF 11
TRANSMISSION MATERIALS STANDARD SPECIFICATION
6.0
10-TMSS-05, Rev. 01
DATA SCHEDULE
BARE COPPER-CLAD STEEL GROUNDING CONDUCTOR AND GROUND ROD REFERENCE SECTION NO. 4.2.3
DESCRIPTION
'B'
'C'
Copper-Clad Steel Ground Rod Nominal Diameter (mm)
16 or 19
Actual Diameter (mm)
14.3 or 17.1
Minimum Length (mm)
3,000
4.3
Conductivity of Annealed Steel Wire (% IACS)
4.4
Direction of Lay
4.5
Minimum Copper Thickness for:
Copper-Clad
40 left hand
Copper-Clad Steel Wire (mm) Ground Rod (mm) 4.6
'A'
*
0.25
Length of Grounding Conductor Total Required Length (m)
*
Maximum Length per Reel (m)
2,000
Tolerance in Length per Reel
±5%
Type of Reel
10TMSS05R01/MSO
wooden
Date of Approval: September 07, 2010
PAGE NO. 10 OF 11
TRANSMISSION MATERIALS STANDARD SPECIFICATION
6.0
10-TMSS-05, Rev. 01
DATA SCHEDULE
BARE COPPER-CLAD STEEL GROUNDING CONDUCTOR AND GROUND ROD A.
ADDITIONAL TECHNICAL INFORMATION OR FEATURES TO BE FURNISHED BY SEC:
B.
ADDITIONAL SUPPLEMENTARY DATA OR BIDDER/VENDOR/SUPPLIER/CONTRACTOR:
B.
OTHER PARTICULARS TO BE FILLED UP BY BIDDER/VENDOR/SUPPLIER/ CONTRACTOR:
FEATURES
Actual Manufacturer of Equipment/Material
PROPOSED
BY
Vendor/Supplier/ Contractor
Name of the Company Location and address
Name and Signature of authorized representative and date
Official Seal/Stamp of the Company & Date
10TMSS05R01/MSO
Date of Approval: September 07, 2010
PAGE NO. 11 OF 11
