132KV, 1200 SQMM XLPE CABLE UNDER GROUND CABLE CONSTRUCTION METHOD

MY Work experience 

I experienced here

Ø 132kv U/G cable construction procedure

Ø Time taking for each section to complete and required materials , manpower and machinery

Ø List of RFI and Inspections from Baldiya 3^rd party agencies like Saudi labs

Ø Coordination’s with various services prior to starting

Ø Licessaning with SECO engineers(For Materials and work inspections)

Ø Ground work required before starting of new section (ie cross check the entire route practically for any crossing or overlap of other services, required materials , permissions)

132 kv UG cable Work procedure

Machinery required

1.     Asphalt cutting machine

2.     Roller (compactor)

3.     Cable pulling machine

4.     Cable rollers

5.     Poclain excavator

6.     Loader          

7.     Dumper

8.     Spirit level

Materials required

1.     1Cx132kv xlpe copper cable

2.     Red sand

3.     Protection tiles (Red colour for 132kv cables and green colour for FO cable)

4.     Metal mesh

5.     Warning tape

6.     Cement bricks(190 pieces per joint box)

7.     White sand for joint box

8.     Cement bags for joint box

9.     110mm UPVC sleeves

10.                        32mm upvc sleeves

11.                        48 fibres FO cable

12.                        280mm co axial cable(bonding cable)

13.                        240mm bare copper conductor

14.                        19sqmm, 1.8mtr long copper rod

15.                        Corrugated pipe(kopex pipe)

16.                        Link box

17.                        Manhole with lid

18.                        MC1(medium curing)

19.                        RC2(Rapid curing)

Test reports required

Ø MIR for all materials with approvals

Ø TR (Thermal resistivity) value for excavated soil value to be less then 1.2kw/m

Ø Sub base and asphalt compaction test (value not less than 97.5%)

Work procedure

Ø After getting permission from Baldiya(clearing all the coordination’s)

Ø We have to mobilize all the safety barricades, safety sign boards and safety mesh and 25Kva DG for lighting  along the excavated area in night times(3cx2.5sqmm PVC cable and 15watt lamps with holders)

Ø We have to start marking and cutting the asphalt with asphalt machine (1 person required)

Ø After marking will start first a trail pit  to confirm the non availability of existing services and will start trench excavation (1.7mtr depth and 1mtr width)

Ø After completion of excavation and joint box then we have to raise RFI and to be cleared

Ø Once RFI was passed then we have to go for 100mm red sand bedding

Ø After red sand bedding we have to arrange cable rollers for every 2mts, cable pulling machine and to shift the cable drums to one end of trench and the other end to cable pulling machine and also provide a back stay of both pulling machine and cable drums while pulling

Ø While cable pulling RFI has to be inspected by SECO and after completion of cable pulling , we have to lay 100mm UPVC pipe fitting of 2layers for FO cable

Ø Once after laying the UPVC pipes , then we have to backfill the red sand @ 700mm then water curing to be done

Ø After that we have to take RFI from seco for tiles laying once it was cleared then we have to go for 100mm sand laying and metal mesh up on it

Ø After the inspection for metal mesh from SECO we have to start sub base laying and  compaction for 200mm after completion of compaction we have to raise RFI for compaction from SECO and Baldiya 3^rd party agency

Ø If the compaction was passed then we have to lay warning tape

Ø And we have to start if first layer sub base has cleared inspection and have to start 2^nd layer 200mm n compaction

Ø After clearing Inspection from Baldiya consultant if it is passed then we have to lay MC1 (medium curing), RC2(Rapid curing 2)  on edges of existing asphalt edge and to take inspection from Baldiya consultant

Ø Asphalt to be layed and compaction in 2layers and to get cleared Inspection from Baldiya consultant