TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
TABLE OF CONTENTS
1.0
SCOPE
2.0
BURIAL DEPTH
3.0
MINIMUM BENDING RADIUS FOR POWER CABLES
4.0
PULLING TENSIONS AND SIDEWALL PRESSURES
5.0
PARAMETERS OF CABLE PULLING
6.0
DIRECT BURIED CABLE INSTALLATION
7.0
CABLE INSTALLATION IN UNDERGROUND STRUCTURES
8.0
CABLE TRENCH DESIGN PARAMETERS
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 2 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
TABLES
05-01 Minimum Cover Requirement in mm from Grade Level to the Top Surface of a Cable or
Duct
05-02 Minimum Bending Radius for Power Cables
05-03 Coefficient of Friction
05-04 Minimum Allowable Percent Conductor Cross-Section Within a Conduit or Duct
05-05 Clearances of SEC Cables and other utilities
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 3 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
FIGURES
05-01
Typical Cross-Section of Trench for 110 kV, 115 kV or 132 kV XLPE Power Cable;
Single Circuit, Trefoil Formation, Direct Burried.
05-02
Typical Cross-Section of Trench for 110 kV, 115 kV or 132 kV XLPE Power Cable;
Single Circuit, Trefoil Formation, Concrete Ductbank.
05-03
Typical Cross-Section of Trench for 110 kV, 115 kV or 132 kV XLPE or LPOF Power
Cable; Single Circuit, Flat Formation, Direct Burried.
05-04
Typical Cross-Section of Trench for 230 kV or 380 kV XLPE or LPOF Power Cable;
Single Circuit, Flat Formation, Direct Burried.
05-05
Typical Cross-Section of Trench for 110 kV, 115 kV or 132 kV XLPE or LPOF Power
Cable; Single Circuit, Flat Formation, Concrete Ductbank.
05-06
Typical Cross-Section of Trench for 230 kV or 380 kV XLPE or LPOF Power Cable;
Single Circuit, Flat Formation, Concrete Ductbank.
05-07
Recommended Clearances Between SEC Underground Power Cables 110kV to 132kV
and Other Utilities's Lines
05-08
Recommended Clearances Between SEC Underground Power Cables 110kV to 380kV
and Other Utilities's Lines
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 4 OF 26
TRANSMISSION ENGINEERING STANDARD
1.0
TES-P-104.05, Rev. 0
SCOPE
The purpose of this section is to provide design considerations of cable installation for direct
buried or duct applications in the system of Transmission Business Unit (TBU) of Saudi
Electricity Company (SEC), Kingdom of Saudi Arabia.
2.0
BURIAL DEPTH
2.1
Unless otherwise required at greater depths by Agency/Ministry having right-of-way
jurisdiction, or due to adjacent utilities limitations or ampacity requirements, the
burial depths for conduit and cable shall be as shown in Table 05-1.
Table 05-01: Minimum Cover Requirements in mm From Grade Level
To the Top Surface of a Cable or Duct
Voltage
(kV)
110 to 380
Type A:
Type B:
2.2
3.0
Direct Buried
Cables
Direct Buried
Conduit
920
610
Direct Buried Rigid
Steel Conduit
Type A
Type B
310
460
Light Traffic Areas
Heavy Traffic Areas
For paved roads, the grade level is the surface immediately below the concrete or
asphalt pavement. Subgrade is another term for this surface. For unpaved roads or
areas, the grade level is the road shoulder surface or natural ground level.
MINIMUM BENDING RADIUS FOR POWER CABLES
3.1
Bending of Power Cable at a short radius may damage the insulation, shielding or
jacket of the cable, therefore, during cable installations, care must be taken that no
sharp bends or sharp twists are made. Whenever angles and/or bends in the route are
encountered, care shall be taken to ensure that the rollers are properly positioned so
that the allowable bending radius of the cable is not exceeded.
3.2
The rollers shall be adequately braced against tensions and side pressure that will be
encountered during the cable pull. The transition through the angle and/or bend shall
be uniformed to conform to the arc of a circle. Radii at the angles shall be as large as
practical to minimize pulling tensions and sidewall pressures. The bending radii
shall match those used in tension and sidewall pressure calculations.
3.3
Power Cable's bending radius shall not be less, under any circumstances, than the
recommended values given by the power cable's manufacturer.
3.4
The cable shall not be bent to less radius than the drum's radius of the cable reel on
which it was shipped.
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 5 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
3.5 Minimum bending radius (r) to which cables may be bent refers to the inner surface of
the cable and not to the axis of the cable at the bend as shown in the below figure:
The minimum bending radius for permanent training during cable installation shall
be as shown in Table 05-2.
During cable installation, large diameter wheels, pulling sheaves, and cable guides
shall be used to maintain the specified bending radius. Larger radii are recommended
wherever the cable is being pulled under tension, preferably not less than twice the
values for permanent training.
Table 05-2: Minimum Bending Radius for power cables
Type of Cable
Single Core Cable - Shielded
Single Core Cable- Non shielded
Multi Core Cable - Shielded
Multi Core Cable- Non shielded
Single Core Cable with segmental
Conductor
Armored Cable
Corrugated Al. Sheathed
* Note :
TESP10405R0/AAG
Minimum Bending Radius (r) as a multiple of
Cable Diameter (d)*
Permanent Training
Pulling Under Tension
Radius(mm)
Radius(mm)
r=8×d
r =16× d
r =10× d
r =20× d
r = 6× d
r =12× d
r = 8× d
r =16× d
r =12× d
r =24× d
r =12× d
r =15× d
r =24× d
r =30× d
In case the cable manufacturer recommends larger bending radius,
his recommendation shall be complied with.
Date of Approval: February 18, 2007
PAGE NO. 6 OF 26
TRANSMISSION ENGINEERING STANDARD
4.0
TES-P-104.05, Rev. 0
PULLING TENSIONS AND SIDEWALL PRESSURES
4.1
General
4.1.1
The axial and tangential forces applied during the pulling process shall not
damage any component of the cable assembly during the installation of
XLPE, UGNMFOC and LPOF Cables.
4.1.2
When installing cable in vertical runs, pulling the cable from the top of the
run rather than the bottom will greatly reduce the pulling tension, and reduce
mechanical forces on the cable accordingly.
4.1.3
Detailed maximum pulling tension and sidewall pressure calculations with
the route drawings showing bending radii, roller placement and dimensions
shall be developed and submitted to SEC (TBU) for each specific cable pull
section within the cable route.
The maximum values shall not exceed the values specified and recommended
by the cable manufacturer.
4.2
4.1.4
Detailed cable pulling calculations shall be submitted to SEC (TBU) for
approval and review prior to all cable pulling operations.
4.1.5
Pulling calculations and drawings which indicate the maximum allowable
pulling tensions and sidewall pressure, shall be provided to pulling crews
prior to all cable pulls.
4.1.6
The placement of all rollers that conforms to the radii bends and degree angle
curves shall be verified prior to commencing the cable pull.
4.1.7
The tensile capability of every cable formation is dependent upon the tensile
limitations of the conductor plus the overall integrity of the cable design.
Each factor has finite limitations which shall not be exceeded.
The maximum pulling tension placed on a cable shall not exceed the following
4.2.1
TESP10405R0/AAG
For cable equipped with a pulling eye or bolt attached to the conductor.
a.
For copper of any temper and hard-drawn aluminum, maximum
tension in newtons (N) is equal to 70.216 times the cross-sectional
area of the conductor in square millimeters (mm2).
b.
For 75% hard-drawn aluminum, maximum tension in newtons (N) is
equal to 52.662 times the cross-sectional area of the conductor in
square millimeters(mm2).
Date of Approval: February 18, 2007
PAGE NO. 7 OF 26
TRANSMISSION ENGINEERING STANDARD
4.2.2
4.3
TES-P-104.05, Rev. 0
For cable to be pulled with a cable grip over the sheath:
a.
For a cable with a lead sheath, maximum tension in newtons (N) is
equal to 10.342 times the lead cross-sectional area in square
millimeters(mm2).
b.
For cable with copper or aluminum sheath, the maximum pulling
tension shall not exceed 4.45kN newtons and, shall not exceed the
maximum tension calculated in accordance with paragraph 4.2.1
above.
c.
If manufacturer recommends less maximum tension to be placed than
the specified above, his recommendation shall be followed..
The pulling tension (T) for a given installation shall be calculated from the following
formulas or shall be as per manufacturer’s requirements:
4.3.1
For a straight section:
T
=
9.8 x L x W x f x OF x N
(Eq.05-1)
T
L
W
=
=
=
f
OF
N
=
=
=
Pulling tension in newtons
Length of duct run in m
Weight of cable plus 1% allowance per single core
cable in Kg/m
Coefficient of friction (generally assumed as 0.5)
Occupancy factor
Number of cables per duct
Where:
Coefficient of friction shall be usually taken as 0.5. For new installations
where ducts are well aligned and clean and the cable well lubricated, a value
lower than 0.5 shall be used.
Table 05-03: Co-efficient of Friction
a.
Jacket
Material
Pulling on Roller
Polyethylene
PVC
0.1~ 0.2
0.1 ~ 0.2
Pulling into duct
Without
With
Lubricant
Lubricant
0.3 ~ 0.4
0.15 ~ 0.25
0.5 ~ 0.6
0.25 ~ 0.35
For single-core cable per duct, equation 05-01 becomes:
T
=
9.8 x L x W x f
OF
N
=
=
1
1
(Eq.05-2)
Where:
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 8 OF 26
TRANSMISSION ENGINEERING STANDARD
b.
TES-P-104.05, Rev. 0
For three single-core cables in trefoil formation:
OF =
1
⎛ d ⎞
1− ⎜
⎟
⎝ D − d⎠
2
(Eq.05-03)
Where:
d
D
=
=
Outside diameter of each cable in mm
Inside diameter of duct in mm
4.3.2 For a duct with a bend:
T2 = T1e fa
Where:
T2
=
T1
=
e
f
a
=
=
=
(Eq.05-4)
Tension for the straight section following the bend in newtons
Tension for the straight section proceeding the bend in
newtons
Naperian log base (2.718)
Coefficient of friction
Angle of bend in radians
4.4
The maximum sidewall pressure shall not exceed 4.371 kN/m, i.e. the tension in the
cable in kilonewtons as it leaves the bend shall not exceed 4.371 times the radius of
the bend in meters.
4.5
The following example outlines the applicable tensile considerations for duct
installation. Similar factors are applicable for direct buried cables. For a sample
calculations, assume the following:
Example:
A duct with the following layout:
Cable: Three single-core, 240 mm², copper, shielded, triplexed
Conduit inside diameter = 154 mm
Dimension:
Weight
=
3.15 kg/m per core
Outside diameter
=
41.3 mm per core
Insulation thickness
=
4. mm
Assume f
=
0.5
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 9 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
4.5.1 Pull from point (A) to point (F) in Newtons (N) and meters (m):
Normally the tension calculation is a progressive one as follows:
OF
TB
TC
TD
TE
TF
=
=
=
=
=
=
1
2
= 107
.
.
⎛ 413
⎞
1− ⎜
⎟
⎝ 154 − 413
. ⎠
9.8 x 60 x (3.15 x 1.01) x 0.5 x 1.07 x 3
3002 x 1.48
4442 + [9.8 x 20 x (3.15 x 1.01) x 0.5 x 1.07 x 3]
5442 x 2.19
11917 + [9.8 x 30 x (3.15 x 1.01) x 0.5 x 1.07 x 3]
=
=
=
=
=
3002 N
4442 N
5442 N
11917 N
13418N
Maximum permissible pulling tension on this cable equipped with pulling
eye bolt is (70.216 x 240) x 3 = 50,555 N.
Sidewall Pressure (at C)
=
=
Sidewall Pressure (at E)
=
=
TC in Newton × 10 -3 4442 × 10 −3
=
Bend Radius, m
3
1.48 kN/m ⟨ 4.371 kN/m
TE in newton × 10 -3 11917 × 10 −3
=
Bend Radius, m
3
3.97 kN/m ⟨ 4.371 kN/m
4.5.2 Because the sidewall pressure at point (E) is rather high (though not outside
design limits) it would be desirable to investigate the results if the cable is
pulled from at point (F) to at point (A).
TE =
TD =
TC =
TB =
TA =
9.8 x 30 x (3.15 x 1.01) x 0.5 x 1.07 x 3
1501 x 2.19
3287 + [9.8 x 20 x (3.15 x 1.01) x 0.5 x 1.07 x 3)
4287 x 1.48
6244 + [9.8 x 60 x (3.15 x 1.01) x 0.5 x 1.07 x 3]
=
=
=
=
=
1501N
3287 N
4287 N
6244 N
9246 N
Pulling from at point (F) to at point (A) results in considerably less tension
both at the bends and overall. While, in this case, it would be acceptable to
pull from either direction, it is prudent design to select the direction which
results in the least stress on the cable and equipment provided there are no
extenuating circumstances such as limited set up or working space at one end
or the other.
4.6
During pulling operations, it is frequently necessary to re-reel the cable or pass it
over pulleys or sheaves, to avoid damage to the cable. It is imperative that the cable
shall not be bent over the minimum radius of the cable which may cause damage.
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 10 OF 26
TRANSMISSION ENGINEERING STANDARD
4.7
5.0
TES-P-104.05, Rev. 0
For direct buried, or a combination of direct buried and ducts, cable installations
where the length of the circuit must be pulled in, SEC (TBU) approved rollers, shall
be used.
PARAMETERS OF CABLE PULLING
5.1
General
The following parameters shall be considered during the course of cable pulling:
5.1.1 Conduit or Duct Fill (refer to paragraph 5.2)
5.1.2 Jam Ratio (refer to paragraph 5.3)
5.1.3 Clearance (refer to paragraph 5.4)
5.1.4 Maximum Pulling Tension (refer to section 4.0)
5.1.5 Maximum Sidewall Bearing Pressure (refer to paragraph 4.4)
5.1.6 Minimum Bending Radii (refer to Table 05-02)
For Bending Radii related to communication cables, refer to TCS-T-557.05.
5.2
Conduit or Duct Fill
The size of the inner diameter of the conduit and the outer diameter of the cable will
determine the percentage fill of the conduit.
Conduit or Duct Fill is based on the percentage-fill of the cross sectional area of the
conduit/duct. The number of conductors shall not exceed the percentage fill
specified in Table 05-04.
Table 05-04: Maximum Allowable Percentage-Fill of the
Conductor Cross Section Within a Conduit or Duct
Number of Conductors
In Conduit/Duct
1
2
3
4
5.3
Maximum PercentageFill (%)
53
31
40
40
Jam Ratio (JR)
When three or more single or multicore cables are being pulled into a conduit, their
relative position in the conduit, when being pulled around bends can change, causing
a condition of “Jamming”. If the cables jam in the conduit during pulling, the
likelihood of cable damage is high. The Jam Ratio (JR) is defined as the ratio of the
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 11 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
conduit Inner diameter (D) to cable overall diameter (d). The following formula is
used to evaluate the jamming potential:
ƒ
ƒ
ƒ
D
is larger than 3.0, jamming cannot occur.
d
D
If JR =
is between 2.8 and 3.0 jamming is likely to occur and should be
d
avoided, but clearance must be checked (see paragraph 5.4).
D
If JR =
is less than 2.8, jamming is not likely.
d
If JR =
Where:
D = Conduit Inner Diameter in millimeters (mm)
d = Cable Overall Diameter in millimeters (mm)
5.4
Cable Clearances (CL) in Conduit
Clearances must be checked to ensure that the top conductor will not press against
the top of the conduit. Clearance shall be between 6 mm and 25 mm. The larger
value is used for large cables and severe bends and pulls. The formulae for
calculating clearance are as follows:
5.4.1 Parallel (Triplexed) Cables
CL
=
0.5D - 1.366d + 0.5(D-d) (1-[d/(D-d)]²)½
5.4.2 Multi Conductor Cable
CL = D-d
6.0
CABLES INSTALLATION IN DIRECT BURIED
6.1
In the event of minor damage to outer jacket during installation, heat shrinkable split
sleeve shall be applied to repair the jacket.
6.2
Cables shall be placed in trenches in a single horizontal tier without crossings except
at transition to multi-tier duct banks. Multi-tier direct buried cable arrangements in
trenches are not allowed.
6.3
The route of cable trenches shall avoid above ground and below ground obstructions
so as to maintain a reasonable access to the buried cables. Trenches in unpaved
areas are preferred. A minimum clearance shall be maintained between underground
runs and parallel runs of underground piping. Cables shall not be located under
present or future parallel runs of low level underground piping which could block
access to the cables. Recommended clearances are shown on Fig. 05-01 through Fig.
05-06.
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 12 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
6.4
Power and associated control circuits can be laid adjacent. Three single conductor
cables comprising one three phase circuit (trefoil) shall be laid without spacing. In
order to achieve a reasonable derating factor, a minimum spacing shall be
determined between all 3-phase power circuits. Refer TES-P-104 for derating
effects of adjacent circuits.
6.5
Where cables cross under main roads, concrete slabs, paved areas, railroad, or any
areas that would require extensive or impractical excavations to replace, then they
shall be run in ducts. Where such duct runs exceed 3 meters, overall cable ampacity
shall be based on the duct portion of the run. Bell end or protective bushings shall be
provided on each duct where it terminates.
6.6
If underground cables are routed through a concrete encased ductbank, PVC conduits
shall be of encased-in type and when routed through direct buried PVC conduit, they
shall be of direct buried (DB) type. All conduits shall have bell ends or protective
bushings where the conduits terminate underground.
6.7
Riser Cables
6.7.1 Protection of Riser Cables
Riser cables from underground to overhead systems shall be protected by a
covering that gives suitable mechanical protection up to a point at least 3.7 m
above the ground and at least 0.3 m below ground level. However, it is
desirable that the protective covering be extended as high as practicable.
The use of a plastic or steel guard is generally recommended for protecting
riser cables. The use of a blackplate on all cable riser shield installations will
assure that the cable is completely covered on all sides. Metallic guard shall
be effectively grounded.
Riser shield sizes shall be determined by table 05-04.
6.7.2 Support of Riser Cables
Riser cables shall be supported by suitable clamps fixed on the cable support
structure. They shall not be supported by cable termination devices such as
cutouts, cable terminal connectors, etc.
7.0
CABLE INSTALLATION IN UNDERGROUND STRUCTURES
7.1
Underground structures, as defined in this Standard, shall include manholes, vaults,
substation basements, duct banks, cable trays, handholes and pullboxes.
7.2
All cables installed in underground structures shall be adequately supported and
secured to withstand forces caused by the maximum short circuit current to which
they may be subjected.
7.3
Adequate access space shall be provided to maintain and operate equipment.
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 13 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
7.4
Power and communication cables shall be racked from separate walls. Crossing of
the two circuits shall be avoided.
7.5
All cables which exit from transformer, switchgear, vault, manhole, handhole or
switch enclosures and terminal structures shall be tagged for identification. Tags
shall be permanent, non-corrodible and clearly readable. The following minimum
information shall be put in English and Arabic on the tag:
a.
Transmission and Sub-transmission:
Voltage and Insulation Material
Phase Identification (R, Y, B) for Single Core Cables
Destination (From – To)
b.
Distribution:
i.
Primary:
Feeder Name
Voltage
Phase for Single Core Cables
Destination
ii.
Secondary:
Voltage
Phase for Single Core Cables
Destination
iii.
Service:
Destination or Customer Address
c.
Communication and Control:
Circuit Type
Destination
7.6
Cables shall not be laid on top of other cables.
7.7
All cables shall be installed under applicable requirements of Standard IEEE/ANSI
C2.
7.8
Unless, otherwise specified, all cable installations in substation basements, vaults
and manholes shall be fire proofed.
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 14 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
7.8.1 Power cables shall be fire proofed, except where fireproofing is not necessary
according to 7.8.2 or 7.8.3.
7.8.2 In manholes and other structures containing no oil filled equipment (i.e.
where no oil fire hazard is involved), fireproofing is only necessary where
separation between cables is 45 cm or less.
7.8.3 Fireproofing is not necessary on single conductor primary cable connections
between various items of equipment in transformer vaults. However, fire
proofing shall be installed on primary supply cables, including a single
supply cable, and any other primary or transmission cables in vault or other
structures containing oil filled equipment.
8.0
CABLE TRENCH DESIGN PARAMETERS
8.1
Figure 05-01 through 05-06 indicate standard design parameters for the cable trench
depth, width, backfill and circuit separation.
8.2
Right-of-Way Requirement
8.2.1 Underground Cable’s Route
a.
Parameters of Right-of-Way shall be applicable for both existing and
new road/streets.
b.
The route of the underground cable shall be considered as the shortest
route and avoid or minimize:
•
•
•
•
c.
Communication facilities such as telephone cables.
Thrust boring.
Gas pipelines, water or sewerage pipelines
New roads where reasphalting is required.
The location of the underground cables for new road/streets shall be
as shown in drawings no.SE1040521 and SE1040522 for 69kV to
380 kV.
8.2.2 Duct Location
TESP10405R0/AAG
a.
Unless otherwise specified, the duct for underground cable shall not
be located in the main (busy) lane of the street/road and to be far
away from the median bay at least 1.5 m.
b.
Refer to Figures 05-1 through 05-06 for the required width and depth
of cables trench.
c.
Bending radius (refer to section 3.0).
Date of Approval: February 18, 2007
PAGE NO. 15 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
d.
Unless otherwise specified, separate communication handholes shall
be provided for the underground optical fiber. Communication
Handholes shall be provided at every change of direction, crossing,
start and end of duct bank system and at every 500 m of continuous
cable run.
e.
Unless otherwise specified, separation distance between fiber optic
cables and power cables shall be 300 mm minimum.as per standard
drawing no.SB-036352.
For lower distance, ampacity adequacy shall be verified.
8.2.3 Thrust Boring/Directional Drilling Requirements
a.
Thrust boring or directional drilling shall be used only if other
alternative means of crossing are not possible.
b.
Ampacity adequacy shall be verified where thrust boring or
directional drilling is required.
c.
Thrust boring for 69 kV to 380 kV Underground cables:
d.
TESP10405R0/AAG
i.
The minimum depth of the thrust boring shall be 2.0 m
measured from top of the pipe unless otherwise required at
greater depth by the Agency/Ministry having Right-of-Way
jurisdiction.
ii.
The pipe shall be made of steel. The nominal size of the pipe
shall be minimum of 1067 mm.
iii.
The number of Thrustbore shall depend on required number of
cable circuits and available Right-of-Way. The spacing
between the pipes shall be 2.0 m center-to-center. For more
details, refer to standard drawing no. SA-036227.
Horizantal Directinal Drilling for 69 kV to 380 kV Underground
cables:
i.
The process of directional drilling shall be as per contractor’s
procedure and requirements.
ii.
The number of directional drilling condiuts shall also depend
on required number of cable circuits and available Right-ofWay
iii.
The CONTRACTOR shall submit his proposal for the
directional drilling method. The CONTRACTOR or the
CONTRACTOR’S
approved
SUBCONTRACTOR,
specialized in the art of directional drilling, shall conduct the
Date of Approval: February 18, 2007
PAGE NO. 16 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
same. Drawing and procedures shall be submitted to the
COMPANY for approval prior to start of construction.
e.
iv.
The details of the directional drilling method along with
description of the machinery that will be used shall be
submitted for COMPANY review and approval. The
CONTRACTOR shall explain in details, how the required
clearance between each circuit and other circuit and other
utilities will be maintained.
v.
Prior to commitment of any directional drilling work, the
CONTRACTOR shall get approval and permission from the
concerned ROW approving agencies.
vi.
All the above requirements shall be submitted for COMPANY
review and approval.
Backfilling and Reinstatement shall be in accordance of the
requirements of appropriate authority.
8.2.4 Recommended Clearances between SEC Underground Power Cables and
Other Utilities' Lines
Unless otherwise specified by the Design Engineer in the SOW/PTS after
consultation with relevant facility, the following clearances between U/G
power cable and other facilities such as water, sewer, gas, telephone shall be
used:
Table 05-05: Clearances of SEC U/G Cables & Other Utilities lines
Utility
Water & Sewer
Telephone
Gas
8.3
SEC UNDERGROUND CABLES
110 kV to 380 kV
Horizontal
Vertical
Clearance
Clearance
(mm)
(mm)
1000
500
5000
1000
1000
500
Cable Route Marker
8.3.1 Warning posts shall be installed along the center line of the trench at not over
50 m intervals on congested areas and not over 90 m intervals on open areas
and at all locations where the trench changes direction.
8.3.2 On straight route, the warning post shall have a two-arrow sign to indicate
cable route direction.
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 17 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
8.3.3 On right angle turn, the warning post shall have two signs each having an
arrow pointing to the cable route direction. The signs will be placed on the
applicable side of the post.
8.3.4 On oblique turn, the cable route direction shall be indicated by two warning
posts each having an arrow.
8.4
Concrete Encased Ducts
Refer to standard drawing SA-036226 for U/G power cables.
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 18 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
FIGURE 05-01
110 kV, 115 kV or 132 kV XLPE STANDARD TRENCH
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 19 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
FIGURE 05-02
110 kV, 115 kV or 132 kV XLPE STANDARD TRENCH
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 20 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
FIGURE 05-03
110 kV, 115 kV or 132 kV XLPE or LPOF STANDARD TRENCH
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 21 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
FIGURE 05-04
230 kV or 380 kV XLPE or LPOF STANDARD TRENCH
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 22 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
FIGURE 05-05
110 kV, 115 kV or 132 kV XLPE or LPOF STANDARD TRENCH
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 23 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
FIGURE 05-06
230 kV or 380 kV XLPE or LPOF STANDARD TRENCH
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 24 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
Figure 05-07
Recommended Clearances Between SEC Underground Power Cables 110kV to
132kV and Other Utilities's Lines
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 25 OF 26
TRANSMISSION ENGINEERING STANDARD
TES-P-104.05, Rev. 0
Figure 05-08
Recommended Clearances Between SEC Underground Power Cables 110kV to
380kV and Other Utilities's Lines
TESP10405R0/AAG
Date of Approval: February 18, 2007
PAGE NO. 26 OF 26