(PDF) Development of Empirical Formulas and Computer ...

Surface Gravel layer (crushed r ock resistivity) = ... (Gra vel) 3000 Ohm- m. ... Optimization of the grounding grid designs is important in satisfying the minimum cost of the grounding system and ...

(PDF) Porphyry Copper Deposit Model - VARIOS | pablo ...

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SECTION 02276

SECTION 02834 (32 32 23) SEGMENTAL CONCRETE RETAINING WALL SYSTEM. 1.0 GENERAL. Description. The work includes furnishing and constructing a segmental concrete retaining wall (SRW) system, including leveling pad, soil reinforcement, unit drainage fill, reinforced backfill, and incidental materials required for SRW construction to the lines and grades shown on the construction drawings …

Crushed Gravel With Minimum Resistivity Of Ohm Meter

Crushed Rock Asphalt Concrete Shells Type II 1300 ohms granite crusher run 8000 ohms #57 washed granite stone Rounded stone, minimum 1 dia Special high resistivity rock, above 3000 ohm meter crushed stone with minimum resistivity 3000 ohm-m when wet ABC We attempt to avoid the use of surface treatments . cjs series dust .

KLM Technology Group ELECTIRAL GROUNDING CRITERIA …

For calculations of allowable step and touch potentials, the resistivity of the surface material (rho sub s) shall be assumed to be 3,000 ohm-meters for a minimum 75 mm thick pad of clean crushed rock, 10,000 ohmmeters

OSU PacWave Connection Monitoring

open graded 1 inch to 2 inch minus crushed rock containing no fines or round rock, less than 2 percent passing the #200 sieve. G. Substation Rock Fill: 1. Substation surfacing rock shall achieve a wet electrical resistivity of 3000 ohm-meters or greater 2. Substation surfacing rock shall be installed in a 6-inch (150mm) layer over the entire

2D Electrical resistivity survey Research Papers ...

This paper presents 2D electrical resistivity imaging to investigate the shallow subsurface characteristics at the archaeological site of Bukit Choras, Kedah, Malaysia.The study identified the subsurface was consisted of two main zones; low resistivity zone with a depth of 2 to 3 m and resistivity range value of 100 to 500 Ohm.m, surrounded by ...

crushed gravel with minimum resistivity of ohm meter

crushed granite metal site sulekha, and grade on shallowdoes crushed granite pack down firmly crushed gravel with minimum resistivity of ohm meter, Crushed stone is drawn from the surge.

KANSAS DEPARTMENT OF TRANSPORTATION SPECIAL …

Resistivity > 5000 ohm-cm AASHTO T 288 pH: 5.0 to 10.0 AASHTO T 289 Organic Content < 1% AASHTO T 267 If the resistivity is less than 5000 ohm-cm, but greater than 3000 ohm-cm, the backfill material can be accepted if it complies with TABLE 1107-3. TABLE 1107-3: ADDITIONAL ELECTROCHEMICAL REQUIREMENTS Property Requirements Test Method

TES-P-119-10-R0[1].pdf - VSIP.INFO

SEC substation yard shall be surfaced with a 100 mm layer of high resistivity of 3000 ohm-meter, asphalt material that extends l.5 meters outside the fence perimeter if space permits. If for some reasons it is impractical to asphalt the site surface, then 80mm to 150 mm layer of gravel or high resistivity crushed rock shall be spread on the ...

January 5, 1998

• Resistivity values shall be greater than 3,000 ohm-cm. If the resistivity value is greater than 5,000 ohm-cm, then chloride and sulfate testing will not be required. Prepare coarse lightweight aggregate samples in accordance with SC-T-143 and test to determine the value using ASTM D1resistivity (submerged)125. Soak fine

J.L'S EXCAVATING LTD. 23-Dec-10 RESISTIVITY TEST (ASTM G …

The wet resistivity of the aggregte (21887 Ohm-m) meets BC Hydro minimum requirement of 3000 Ohm-m. Per: Reviewed by: John Burton, P. Geo Sr. Geologist Lab. Supervisor Jim Hernandez, AScT Trial 1 38684 1018 611 As is /Dry Saturated Wet 22396 20360 Trial 2 Gravel Specified minimum wet resistivity Gravel Sr. Project Technologist/ Gravel Washed ...

Engineering Standard

4.4.5 For calculations of allowable step and touch potentials, the resistivity of the surface material (rho sub s) shall be assumed to be 3,000 ohm-meters for a minimum 75 mm thick pad of clean crushed rock, 10,000 ohm-meters for a minimum 50 mm layer of asphalt, and 200 ohm-meters for a minimum 75 mm layer of concrete.

(PDF) Substation Design Manual | shally gupta - Academia.edu

S4 110/33 Type Z – Zone Substations Network Connection Z1 132/22 Ultimately an "N-1" design based on a minimum of two primary Z2 132/11 feeders, two transformers, and a three section secondary busbar. Z3 110/11 At 66kV and above the bus is Z4 66/33 …

Grounding Design Calculations – Part Twelve ~ Electrical ...

The entire area inside the fence and including a minimum of 1.0 meter (3.3 feet) outside the fence needs to be covered with a minimum layer of 10 cm (4 inches) of protective surface material such as crushed rock (or approved equal) possessing a minimum resistivity of 3,000 ohm-meters wet or dry.

APPENDIX 'D' CN CRUSHED ROCK BALLAST MATERIAL …

9 Ballast Resistivity 9.1 When tested as described in Appendix A, ballast resistivity shall not be less than 3000 ohm-meters. 10 Frequency of Testing 10.1 At the start of production the Producer shall carry out all tests described in Sections 4 to 9 inclusive to establish compliance with this specification.

Section 2432 - Revised 4/21/2020 - Secure Home

Class 3 durability crushed stone coarse aggregate. The use of gravel requires the Engineer's approval and is based on past history of deleterious and stain-producing material found in the aggregate source. ... Resistivity > 3000 ohm-cm AASHTO T 288. pH range 5 to 10 AASHTO T 289. Chlorides < 100 ppm AASHTO T 291 ... Compact to a minimum 95% ...

Crushed Rock Track Ballast Specification

The crushed rock ballast shall be fully issued from crushing operations. The crushed ... AREMA minimum value of 2.6. ... When tested as described in Appendix A, ballast resistivity shall not be less than 3,000 ohm-meters, and all tests shall indicate average mean low value.

Mrkeystone.net" Keyword Found Websites Listing | Keyword ...

Crushed Gravel With Minimum Resistivity Of 3000 Ohm Meter. Kleine-krabbelkaefer.de DA: 27 PA: 50 MOZ Rank: 81. Crushed Stone Kualitas B crushed gravel with minimum resistivity of 3000 ohm meter; Crusher Stone Find Our Lowest Possible Price; 3000 ohm meter crush rock gold ore crusher above 3000 ohm meter crushed stone with minimum resistivity ...

Section 02726 - Crushed Rock Ballast

CRUSHED ROCK TRACK BALLAST 32 11 25 (July 2018) formerly: GO-TRK BALLAST SPEC-10.0-2016-REV0 ... density (specific gravity) shall be taken and verified against the AREMA minimum value of 2.6. 2.7 SOUNDNESS AND RESISTANCE TO ABRASION . ... ballast resistivity shall not be less than 3,000 ohm- meters, and all tests shall indicate average mean low ...

SUBSTATION DESIGN CRITERIA DOCUMENT

resistivity unfrozen soil layers. The sub-grade ground grid connectors will be the "Hyground irreversible compression system" type - as manufactured by Burndy. All group operated airswitch mechanisms will have personnel protection mats below grade (installed with 4" of crushed stone cover) at each operating mechanism location.

why crusher pieces laid in electrical substations

Crusher Rock In Substation why we use crushed stone a layer crushed gravel with minimum resistivity of 3000 ohm why crusher pieces laid in electrical substationscrushed gravel with minimum resistivity of 3000 ohm meter rock is crushed in stone crusher . Further Details

Request for Quotation Abstract: Supply/Delivery of ...

Resistivity of Wet Material > 3,000 ohm*meter Los Angeles Abrasion - maximum loss of 35% Item 4 Delivery of 3/4" to 1 1/2" clean crushed limestone Item 5 Supply of approximately 1,500 tonnes of 2" down crushed limestone. Sieve Size mm (inches) Percent passing by weight 50 (2") 100 4.75 (No. 4) 35-60 0.075 (No. 200) 6-17 Item 6 Delivery of 2 ...

ground grid design with 3000 ohm-m soil resistivity ...

With an area of 2500 pi^2, and, 500 pi of buried conductor, I get a grid resistance of about 100 ohm!, which is way above the recommended 5 ohm. But it is almost impossible to go lower than that with a 3000 ohm-m soil resistivity. The fault current is 2675A and L-N voltage is 14.4 kV.

SUBJECT: Limited Geotechnical Engineering Investigation ...

Minimum Resistivity > 3,000 ohm-cm 9. Open graded materials such as crushed rock and pea gravel are not recommended for use as backfill for excavations because these materials can result in migration of finer particles above and surrounding the backfill into voids in these materials, which could result in settlement of the ...

crushed quartz aggregate

Material Weights - Harmony Sand & Gravel. Tile. 2970. 1.43. Trap stone. 5849. 2.52. Most of Harmony Sand & Gravel's products will weight approximately 2,840 pounds per cubic yard or about 1.42 tons per cubic yard. For estimating purposes, most Contractor's consider the yield to be 3,000 pounds per cubic yard or 1.5 tons per cubic yard. Learn More

TES-P-119-10-R0[1].pdf | Electrical Substation | Cable

SEC substation yard shall be surfaced with a 100 mm layer of high resistivity of 3000 ohm-meter, asphalt material that extends l.5 meters outside the fence perimeter if space permits. If for some reasons it is impractical to asphalt the site surface, then 80mm to 150 mm layer of gravel or high resistivity crushed rock shall be spread on the ...

Tes-p-119-10-r0[1].pdf [2nv8md7rqylk]

SEC substation yard shall be surfaced with a 100 mm layer of high resistivity of 3000 ohm-meter, asphalt material that extends l.5 meters outside the fence perimeter if space permits. If for some reasons it is impractical to asphalt the site surface, then 80mm to 150 mm layer of gravel or high resistivity crushed rock shall be spread on the ...

Substation Grounding Design Challenges And Lessons Learned

crushed rock resistivity testing •california substation •3,000 ohm -m crushed rock was difficult to find. •compacted asphalt is 10,000 ohm -m (wet) •2" layer of compacted asphalt cover was used as a highly resistive replacement for crushed rock. 22

SP 209.5 MSE Backfill

304 for Crushed Stone (Fine Gradation) and the following additional requirements: ... Resistivity Minimum 3000 ohm-cm, at saturation AASHTO T 288 ASTM G 57 ... ASTM D 516 *If the minimum resistivity exceeds 5000 ohm-cm, at saturation, the need for testing of chlorides and sulfates is waived. 2.3.3.2 Electrochemical Requirements for ...