Transmission Line Tower Erection

2. Classification of Towers based
on
1)No. of
Circuits
a. Single circuits towers
b. DC/SC towers
c. DC towers
d. MC towers

3. 2)AOD
a) Suspension/Tangent towers <2°
b) Small angle towers 2 ° -15 °
c) Medium angle towers 15 ° -30 °
d) Large Angle towers 30 ° -60 °
e) Dead end towers >60 °
f) Transposition towers(4Xarms)
g) Special towers – JC, MC, NB, NBMC
h) Pole mounted termination towers
i) Mono poles

4. SC DC/SC
(B/B)
MC
(B/B)
NB (B/B)
A P/D(4.2) K(8) 0° (1.3)
B R(7.15) L(8.7) 30° (1.31)
C&D S(7.75) M(11.5) 60°
(3.174)
Bot Xarm
Ht
Bot Xarm
ht
12.283 12.35 12.3
Total
Height
Total
height
27.381 38.46 27.1
132
KV
Note: All in meters

5. L&T TSP M/C NB
A AV/AS X 0°
B BS Y 30°
C CS(8) Z(17) 60° (3.3)
D(11)
BotXarm Ht 16.85 19.085 17.45 11.79
Total Ht 33.5 38.035 51.4 29
220 KV
Note: All in mesters

6. NB MCNB(220KV) MCNB(132KV)
120m 250m 300m
60° 0, 30 & 60 Deg 0°, 30° & 60°
2.2 5.4 3.936
14 13.1 12.15
Special towers

7. Mono pole
180m
0°, 30° & 60°
Bot Xarm Ht 15.8

8. For river crossing suspension towers only
Height(m) Base
width
(B/B) (m)
Bot
Xram(m)
Wt.
(MT)
Full JC 88.2 12.38 69 32.5
Trunk
JC
72.15 10.4 52.5 28.9
JC

9.  +3m
 +6m
 +9m
 +12m
 +18m
 +25m
 +30m
Tower extensions:
Generally extensions are added to the tower at Bottom section .
Cage Extension is added at cage for dead end towers, the extension
Will be of 3m & 5m

10.  Normal span: 320m for Panther
 350m for Zebra and L&T
towers
 380m for Moose and TSP
towers
 950m for JC
 Actual span
 Wind span
 Weight span: Left wt. span & Right wt.
span
 Equivalent span
 Negative span
SPANS:

11. Erection
a) Setting of stubs:
Template
B/B & diagonal at Template top
B/B & diagonal at stub top Ram bus shape
Stub cleats with B&N 2 each
Extra cleats to avoid failure of foundation
due to tower falling.
Threads to bisect
LP&AP
Template height at centre point & joining of
2 threads
Probe setting

12. b) After 14 days of curing
Built-up method:- This method consist of erection of
towers member by member. The 4 main leg members of
first section of the tower are first erected and guyed of. The
cross braces then assembled. For assembling second section
a light gin pole is placed on top of the corner legs for
raising the second section of the tower. Afterwards the gin
pole is shifted to top of second section leg to raise third
section this process is continued till complete tower is
erected.

13. Section method :-
Major sections of the tower are assembled on the
ground and same are erected as units.
Either mobile crane or gin pole of 10m long is
used.
Ground assembly(Proto) :-
This method consist of assembling the tower on
ground and erecting it as a complete unit. The
complete tower is assembled in line wise position
to allow Xarms to fitted. After assembly is
completed tower is picked up from ground with
the help of crane and carried to is location and
set on its foundation.
This method is not is useful when the towers are
large and heavy and the locations are difficult.

14. Helicopter method :-
In this method the tower is erected in section.
Bottom section is first lifted on to the stub and
then the upper section is lifted and bolted to first
section and the process is repeated till the tower
is erected. Some times complete assembled tower
is raised with the help of helicopter. This method
is adopted when approach is impossible.

15. oTower parts – 86 Microns
oBolt & Nuts - 45 Microns
Galvanization :
MS tower parts to Galvanized tower parts
Galvanization Procedure
1 2 3 54 6 7 8
1. Decreasing Bath Hard HCL
2. Pickling HCL
3. Rinsing Water
4. Fluxing Ammonia and Zinc Chloride
5. Hot plate
6. Zinc batch
7. Dychromizing
8. Finishing & Filling

16. Tightening of B&N
The bolts & nuts are used to join the tower parts
The bolts are of 16mm diameter and 20mm diameter
The length of bolts are various from 35mm to 80mm
multiple of 5mm
17.5mm/21.5mm dia hole is provided on tower part for
fixing bolt & nut
Spring washers - 16 x 3.5 mm- to tighten the bolt&nut
Flat washers 4, 5, 6, 8, 10,20 and 25mm to fill up gaps
between the tower parts
Check for tight of B&N using torque wrench

17. The threads of bolts projecting out side shall be
punched at 3 positions and do half round welding
to
ensure that nuts are not loosened in course of time
and avoid theft of angles.
Zinc epoxy painting is applied on welded portion to
avoid rusting.

18. Tower verticality :- 1 in 360
Slenderness Ratio = Effective length of members / Radius
of gyration
SR gives Resistance of any member to
bending
SR for leg members - 150
Tension members - 350

19. Grounding : -
pipe earthing –Tower foot Resistance<15
ohm
CP earthing - 15 – 30 m of 7/8 or 7/9
SWG
galvanized steel wire
50x6mm flat of 1.5m length is used & flat
should be buried at 0.6m below the ground
level.
 Earthing pipe is of 25mm dia, 3050 meters
length GI pipe with holes.
Explain practice of coke and salt, betonite
powder

20. earthing is provided for D leg only
For Railway crossing double earthing is
to be provided.
Normally earth pipe is placed vertically
& in difficult places earth pipe placed in
slant position with prior approval.
A pit of 300mm dia and 3.2m depth is
excavated to place earth pipes.

21. Tower Accessories: -
Danger boards
Number plate
Phase plate
Anti Climbing Device
Step bolts 16x175 mm
Antiperch / Bird guards for suspension towers
Hanger rods

22. i) NO TOWER SHALL BE ERECTED ON FOUNDATION
BEFORE 10 DAYS AFTER CONCRETING.
ii) CHECK THE CORRECTNESS OF DIAGONAL AND
LEVEL OF THE STUB OF THE FOUNDATION.
iii) TOWERS ARE TO BE ERECTED AS PER ERECTION
DRAWING
iv) ASSEMBLY OF TOWER PARTS SHALL BE MADE AS
PER MARK NUMBER WISE ENGRAVED ON THE
TOWER MEMBER CORRESPONDING TO NUMBER IN
THE ERECTION DRAWING.
v) SPECIAL CARE SHALL BE TAKEN IN SELECTION OF
MARK NUMBER FOR TRANSVERSE AND
LONGITUDINAL FACE OF THE SQUARE BASE TOWER.
vi) ANY BUCKLING, DAMAGE TO STEEL MEMBER,
DAMAGE TO GALVANIZING SHALL BE AVOIDED

23. vii) NO MEMBER SHALL BE SUBJECTED TO UNDUE
STRESS.
viii) REASON CAN BE: (i) DEFECTIVE FABRICATION.
(ii) DEFECTIVE FOUNDATION.
(iii) DEFECTIVE ERECTION
METHOD.
viii) COLLECT MATERIAL FROM STORE TALLYING WITH
BOM.
ix) PREFERABLY TRANSPORT COMPLETE TOWER OR
COMPLETE SECTION.
x) THE TOWER MEMBER AT LOCATION SHALL BE KEPT
ON GROUND SERIALLY ACCORDING TO THE NEED
FOR FOLLOWING UP ERECTION SEQUENCE.

24. TOWER ERECTION
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
CROW BARS
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
CROW BARS
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
CROW BARS
DERRICK
DERRICK TYING ROPE
20mm POLY
PROPYLENE
ROPE
CROW BARS

27. i) WHILE LOADING AND UNLOADING THE TOWER PARTS,
CARE SHOULD BE TAKEN FOR STACKING
SYSTEMATICALLY.
ii) HANDLE THE TOWER PARTS CAREFULLY. WHILE
HANDLING THEM WEAR SUITABLE GLOVES.
iii) ESTABLISH CLEAR SIGNAL/COMMUNICATION
BETWEEN THE PERSONS WORKING ON THE TOP AND
THE PEOPLE SUPPLYING TOWER PARTS, WATCHING
GUYS PULLING ETC SPECIAL CARE SHALL BE TAKEN
FOR R.C. TOWER.
iv) ALL LIFTING TOOLS AND TACKLES SHOULD BE LOAD
TESTED AS PER STANDARD.

28. vi) ENSURE THE DERRICK USED BEFORE TOWER
ERECTION HAS BEEN CHECKED FOR ADEQUATE
STRENGTH / SIZE.
vii) KEEP WATCH ON ALL GUYS USED DURING ERECTION
ANY SLIPPAGE/FAILURE IF THE GUY CAN CAUSE
ACCIDENT.
viii) POLYPROPYLENE ROPE FROM 20MM TO 25MM SIZE
SHOULD BE USED FOR GUYING & LIFTING.
ix) AFTER 5 OPERATIONS CHECK THE CONDITION OF THE
ROPE. IF WORN OUT THEN REJECT.

29. xi) ALL TOWER MEMBERS TO BE FITTED WITH
APPROPRIATE SIZE OF NUTS & BOLTS OF THE SECTION
ERECTED BEFORE THE ERECTION IS TAKEN UP FOR THE
NEXT SECTION.
xii) AVOID ALL TOWER ERECTION IN RAINY DAY.
xiii) HEAVILY CLOUDY DAYS AVOID ALL TYPE TOWER
ERECTION. STOP TOWER ERECTION OF R.C.TOWER.
xiv) IN CASE OF HEAVY WIND OR APPROACHING STORM
STOP ALL TOWER ERECTION. EVERY ONE SHOULD BE
AWAY FROM THE TOWER.
xv) PPE LIKE HELMET, SAFETY BELT OF PROPER QUALITY IS
USED.
xvi) FOR CLIMBING TOWER USE SAFETY BELT WHICH CAN BE
FITTED TO THE TOWER.

32. Conductor Amps Kg/KM AL59 INVAR
Panther 489 974 734 Amp. Double
Panther
30+7/3.00
Zebra 737 1621 930 Amp. Double
Zebra
54+7/3.18
Moose 840 1998 54+7/3.53
LINE MATERIALS
1.Conductors

33. AAAC- Less wt., more sag, & more current carrying capacity
ACSR- More wt., less sag, & less current carrying capacity
I. Total No. of wires = 3N(N+1)+1 ; Where N= No. of layers
Layer No. of
wires
Total
Centre 1 1
1st
6 7
2nd
12 19
3rd
18 37

34. II. Lay Ratio = Lay/OD ; Where OD = Outer diameter=(2N+1)d;
where d= Dia of single strand
18 wires 10 – 12
12 wires 12 -14
6 wires 13 -18

35. 2.Earth wire: Shielding angle 10 – 30 °
7/3.66 → 7/3.15
Weight /KM 575 428 Kg/KM
3. Insulators: 70 KN, 120KN and 160
KN
Voltag
e
Suspension Angle
132KV 9Nos 10Nos
220KV 13Nos 14Nos
400KV 23Nos 24Nos

36. 132÷√3 = 76.2 KV ≈ 80 KV ÷ 11 = 8 Nos + 1 extra = 9 Nos
220÷√3 = 127 KV ÷ 11 = 12 Nos + 1 extra = 13 Nos
400÷√3 = 230.95 KV ÷ 11 = 21 Nos + 1 extra = 22 Nos or Say 23
a) Porcelain Insulators :- Ball and Socket
Long rod
b) SRC Insulators :- Silicon Rubber Composite
FRP rod with sheds, fiber resin plastic rod

37. Insulator hoisting
Suspension insulators shall be used upto deviations of 2
degrees on all tangent type towers on the line and strain
insulators on all angle type towers.
For ensuring insulation co-ordination the suspension or tension
strings on approach and terminal towers near the station ends
upto a length of 1.5 Km shall be provided with adjustable arcing
horns on tower side and fixed arcing horns on line side, keeping
the arcing gap as may be stipulated by the Engineer at site.
Insulator strings shall be assembled on the ground. These shall
be cleaned and examined before hoisting. All accessories shall
be properly fitted.
Those having glazing defects exceeding half centimeter square
shall not be used.

38. For suspension towers 70 KN insulators are hoisted
with Aerial rollers. The Aerial rollers are like single
sleeve pulley .Before hoisting of insulators the M pins
should be checked thoroughly for their opening so that
the insulation will not detached during stringing.

39. 4. SSH for conductor:- PA rods 11 – 14 Nos; where PA=
Preformed Armoured Rods
5. STH for conductor 6. DSH for conductor
7. DTH for conductor 8. SSH for earth wire
9. STH for earth wire
10. 4R stock bridge vibration dampers (1.2 – 1.3m)
11. MS joint for conductor
12. MS joint for earth wire
13. Repair sleeves

40. CORRECT METHODSWRONG METHOD

41. i) SELECT CONTINUOUS STRETCH AND STARTING TYPE OF
TOWER FOR STRINGING WITH ADEQUATE CARE.
ii) PREPARE DRUM SCHEDULE FOR CONDUCTOR WITH CARE TO
REDUCE WASTAGE.
iii) SELECT PROPERLY THE PLACEMENT SCHEDULE FOR
TENSIONER AND PULLER.
iv) SELECT THE PLACE CAREFULLY FOR PLACEMENT OF
TENSIONER AND PULLER TAKING SITE CONDITION INTO
CONSIDERATION.
v) CHECK CORRECTNESS OF ERECTED TOWER AS PER
DRAWING AND SPECIFICATION FOR ALL TOWERS.
vi) CHECK COMPLETION OF EARTHING AND RECORD TOWER
FOOTING RESISTANCE OF EACH LOCATION.
vii) ALL TREES ENROUTE THE LINE SHOULD BE CLEARED AND
REMOVED FROM THE TRAVELLING PATH OF CONDUCTOR.
viii) CERTIFY AFTER VERIFICATION JOINTLY.

43. STRINGING
a)Paving out of conductor
b)Rough sag
c)Final tension / stringing

44. METHOD
 SLACK OR LAY OUT METHOD.
 PAYING BY TENSIONER PULLER.

45. T&P required :-
Tractor/Tensioner
Turn table (5T or 10T)
Conductor socks
Automatic come along clamp for conductor and earth wire
20mm and 25mm D shackles
Wooden packs
Ground rollers
Aerial rollers
Crowbars
Hacksaw blade
Cutting pliers
Screw driver
Spanners

46. 1. Generally drum lengths are
Panther 2KM
Zebra 1KM
Moose 1KM
Earth wire 2KM
2. Place the conductor drum on TURN TABLE & unwind it.
3. Pull the end of conductor over ground rollers and
passing
through Aerial rollers at suspension towers reach the
next cut point tower using tractor/ tensioner.4. Make up the end of conductor to the cut point tower with STH/DTH
5. Follow the same procedure for balance conductors
and earth wire

48. Rough sag
T&P required:-
Rough sag leads
Steel ropes 10mm, 12mm, 15mm and 16mm
Come along clamp (7 bolts)
Slings (20mm)
4 Sheave pulley
2 Sheave pulley
Single Sheave pulley
Manila ropes 12mm, 16mm, 18mm and 20mm
Single and double end socks
Turn buckle
D shakles 20 mm
Dead man 1to 1.2 m

49. 6. By connecting the other end to LEPTY do the rough sag by
pulling with tractor/tensioner and see that conductors
are lifted In all spans by hand height.
7. Common problem is BARD CAGING
LEPTY made with steel rope of 12mm of 200m and
400m lengths with four sheave pulleys on either end.

50. Final tension /Stringing
T&P required:-
1. Leg winch
2. Sag boards
3. 100 MT joint compressor with die sets
suitable for panther, Zebra Moose and earth
wire.
4. Earth wire flat clamps
5. D shackles 16mm/25mm
6. Binoculars
7. Tractor / Tension puller

51. 8. Travelling speed will be 5 – 8 KM per hour.
9. if speed is low causes swinging of traveler and insulator
hardware and higher speed cause damage.
10. Tension load will be around 2000 – 2500
Kgs
11. For 3rd
crossarm stringing tension will be 500
Kgs
12. For 400 KV pilot wire and tensioner is used. First pilot
wire will be passed through the entire reach with Tractor.
Conductor is winded on Tensioner. Pilot wire is knotted to
conductor. The other end of pilot wire is connected to
Puller.slowly puller load applied and tensioner is
releasing the conductor without any problem and make up
at this with STH. Once paving is completed again load
Tensioner till sag point and guyed. Then by Lepty and
Tractor make marking and cater the end.

52. 13. Measurement of sag with equal supports use sag boards
between the two towers of sag span
14. Measurement of sag where supports are at different height
or single spans. Use Dynamo meter for tension readings
15. Sagging section length should not exceed 5KM or 15 spans
16. Physical measurement of ground clearance on roads and
important places.

53. A A
A
1.50M LONG ISMB 200
BACK FILLED EARTH
STEEL ROPE OF 20MM DIA
DETAIL – ‘A’
100MM
300MM
1100MM
150MM

54. BACK FILLED EARTH
1.50M LONG ISMB 200
STEEL ROPE OF 20MM DIA
DETAIL – ‘A’
100MM
300MM
1100MM
150MM
A A
A

55. TOOLS & PLANT REQUIRED PER CONDUCTOR
1. 20mm dia wire Rope Slings 40m length - 1 No.
2. 20mm 'D' Shakles - 2 Nos
3. Come along Clamp (Bolted Type) - 1 No.
4. 20mm Sling 10m length - 1 No.
5. Deadmen wood (1000mm-1200mm long)- 1 No.
DETAIL – ‘B’
2.00M LONG ISMB 200
BACK FILLED EARTH
STEEL ROPE OF 20MM DIA
100MM
300MM
1600MM
250MM
40m Approx.
Excavated pit for Anchoring of Conductor
TENSION TOWER
SUSPENSION TOWER SUSPENSION TOWER
B

56. DETAIL – ‘C’
2.00M LONG ISMB 200
BACK FILLED EARTH
STEEL ROPE OF 20MM DIA
100MM
300MM
2100MM
250MM
C
NOTE: Sling size = 20mm. Depending upon the
Tension load rope size should be selected which
is dependent on no of conductors type and the
tension applied during the sagging.
Arrangement should be capable of 1.5 times of
the total tension load.

57. IMPROPER
GUYING
ARRANGEMENT
RAIL PIECE
BACK FILLED
EARTH
STEEL ROPE
RAIL PIECE
BACK FILLED
EARTH
HOOK
HOOK
STEEL ROPE
HOOK
PROPER
GUYING
ARRANGEMENT
PROPER
GUYING
ARRANGEMENT

60. After stringing ensure the following
Any departures from the correct sag in any span
does not exceed 4 percent.
The sag of any conductor does not depart by
more than 3% from the mean sag of all the
conductors in the same span subject of a
maximum of 150mm.

61. i) BACK TENSION OF BOTH THE TENSION TOWERS OF SAG SECTION IS MOST
IMPORTANT. PROVIDE BACK TENSION BY PAID OUT CONDUCTOR OF THE
NEXT ADJACENT SECTION OF BOTH TENSION TOWERS.
ii) BACK TENSION ON THE TOWER WITH GUY WIRE SHOULD BE AVOIDED.
iii) IF REQUIRED PREPARE A SCHEME AND GOT IT APPROVED BY THE
TECHNICAL CELL.
iv) GUY WIRE CAPACITY SHOULD BE 1½ TIMES OF MAXIMUM TENSION OF THE
CONDUCTORS.
v) INSPECT THOROUGHLY THE CONDITION OF GUY WIRES BEFORE USED.
vi) GUY FIXING ANGLE SHOULD BE BETWEEN 45
o
TO 50
o
TO THE VERTICAL.
vii) GUY BLOCKING ARRANGEMENT SHOULD BE VERY CAREFULLY DONE.
viii) RESPONSIBLE PERSONS SHOULD BE DEPLOYED DURING ENTIRE SAGGING
OPERATION.
ix) MEN ON BACK STAY SHOULD BE PROVIDED WITH APPROPRIATE WHISTLE
AND COMMUNICATION.
x) MEN ON BACK STAY SHOULD BE IN CONSTANT TOUCH WITH FINAL
SAGGING PERSON.

62. xi) ANY WHISTLE OR COMMUNICATION FROM THE PERSON AT BACK STAY,
STRINGING SHOULD BE STOPPED.
xii) IF NECESSARY CONDUCTOR SHOULD BE RELEASED TO DE-TENSION.
xiii) FINAL SAGGING SHOULD BE DONE AS PER APPROVED SAG TENSION CHART.
xiv) ANY CHANGES IN THE SECTION, SPAN MADE DURING THE CONSTRUCTION
THE SAG TENSION CHART SHOULD BE GOT CORRECTED.
xv) THE PERSON IN-CHARGE OF FINAL SAGGING SHOULD HAVE COPIES OF FINAL
PROFILES, SAG TENSION CHART, FINAL TOWER SCHEDULE, SAG TEMPLATE,
PROPER RECORDING REGISTER, FORMATS, ALL DRAWINGS OF HARDWARE
AND ACCESSORIES.
xvi) TWO THERMOMETERS SHOULD BE CLAMPED ON THE TOWER IN ADVANCE ON
THE SAG SPAN.
xvii) TEMPERATURE SHOULD BE CONSTANTLY MONITORED.
xviii) NECESSARY CORRECTION OF SAG BOARD SHOULD BE DONE BEFORE FINAL
MARKING OF CONDUCTOR.
xix) ADEQUATE AND PROPER COMMUNICATION SHOULD BE AVAILABLE AT ALL
POINTS CONTROLLING SAG AND BACK TENSION POINT.

63. xi) ALL EQUIPMENT SHOULD BE LOAD TESTED BEFORE FINAL SAGGING
OPERATION PLANNED.
xii) USE SUITABLE DYNAMOMETERS TO CROSS CHECK SAG, SHORTER
SPAN, HILLY TERRAIN.
xiii) CHECK CONSTANTLY EVENNESS OF THE BUNDLE CONDUCTOR.
xiv) KEEP CONSTANT CHECK ON THE MOVEMENT OF AERIAL ROLLER TO
ENSURE INTERMEDIATE SPAN ALSO REACHED TO DESIRED SAG.
xv) IN CASE ANY CONDUCTOR IS PULLED ABOVE SAG IN THE SAG SPAN
THEN RELEASE BOTH THE CONDUCTORS TO BRING DOWN BELOW SAG
AND BRING EVENNESS AND THEN RE-SAGGED.
xvi) AVOID FINAL SAGGING IN WINDY DAYS, OTHER WISE ALLOWANCE IS TO
BE GIVEN FOR UPLIFT.
xvii) ALLOWANCE GIVING IS NOT DESIRABLE SINCE IT DEPENDS ON THE
WIND AND EXPERIENCE.
xviii) SPECIFIC CARE SHOULD BE TAKEN IN MEASURING FINALLY SAGGED
CONDUCTOR BEFORE CUTTING & COMPRESSING THE DEAD END
CLAMP.

66. i) KEEP THE CONDUCTOR FINALLY SAGGED FOR 48HRS ON
ROLLER.
ii) AGAIN CHECK THE SAG AND RE-ADJUST IT IF NECESSARY.
iii) KEEP SUSPENSION STRING ABSOLUTE VERTICAL.
iv) PLUMB MARK THE CONDUCTOR BEFORE REMOVING ROLLER BY
MEANS OF A PLUMB OR PLUMB MARKER MADE FOR SPECIFIC
PURPOSE.
v) THEN THE CONDUCTOR SHOULD BE LIFTED BY MEANS OF A
SUITABLE LIFTING DEVICE.
vi) LIFTING DEVICE MAY CONSIST OF ONE OR TWO HOOKS
DEPENDING UPON NUMBER OF CONDUCTORS.
vii) AFTER LIFTING THE CONDUCTOR FIX PREFORMED ARMOUR
RODS.
viii) TAKE 2 OR 3 RODS ON EACH SIDE OF THE CENTRE MARK SUCH
THAT THE HAND WILL NOT BE MORE THAN ONE OR TWO PITCH
LENGTHS AWAY FROM THE CENTRE MARK.

67. ix) THE CENTRE MARK OF THE RODS SHOULD BE LOCATED AT THE
CENTRE MARK OF THE CONDUCTOR SUPPORT.
x) APPLY THE RODS BY ROTATING ABOUT CONDUCTOR CONTINUING
FROM 1 OR 2 PITCH LENGTH OF EITHER SIDE OF THE CENTRE.
xi) FIX ARMOUR ROD APPLYING SPIRAL MOTION OF THE HANDS UNTIL
THEIR ENDS ARE SNAPPED INTO POSITION.
xii) FIX SUSPENSION STRING OVER ARMOUR ROD THEN RELEASE THE
LOAD.
xiii) CHECK THE INSULATOR ASSEMBLY IS IN PLUMB.
xiv) INSTALL VIBRATOR DAMPERS OR SPACER DAMPERS AS PER
DRAWING at 1.2 to 1.3 m
xv) IF VIBRATION DAMPERS ARE USED THEN FIX THE LINE SPACER
IMMEDIATELY THERE AFTER.

68. i) ALLOW THE FINALLY SAGGED CONDUCTOR FOR 48HRS TO TAKE
CARE THE CREEPAGE OR MINOR SAG ERROR DUE TO MOVEMENT OF
AERIAL ROLLER.
ii) LIFTING DEVICE SHOULD BE FIXED IN SUCH A MANNER SO THAT
LIFTING LOAD IS TRANSFERRED TO TOWER BODY.
iii) AVOID POINTED LIFTING LOAD ON THE TIP OF CROSS ARM.
iv) LIFTING HOOK SHOULD HAVE A RUBBER OR NEOPRENE LINING.
v) MATCH THE CENTRE OF THE ARMOUR ROD WITH CENTRE MARK OF
THE SUSPENSION POINT.
vi) FIX VIBRATION DAMPERS OR SPACER DAMPER IMMEDIATELY SINCE
THE CONDUCTOR AT FULL LOAD / CRITICAL TENSION.
vii) FIX LINE SPACER IMMEDIATELY FOR BUNDLE CONDUCTOR TO AVOID
CLASHING OF CONDUCTOR.

70. i) MEASURE THE EXACT JUMPER LENGTH REQUIRED
FOR EACH TENSION TOWER.
ii) CHECK THE JUMPER DEPTH, ANGLE AS GIVEN IN THE
ELECTRICAL CLEARANCE DIAGRAM.
iii) PRESS THE JUMPER CONE AND FIX ON THE TOWER.
iv) WHILE FIXING JUMPER THE CONDUCTOR SHOULD BE
EARTHED PREFERABLY ON BOTH THE SIDES.
v) IN CASE OF BUNDLE CONDUCTOR RIGID SPACER
SHOULD BE FIXED AS PER THE RECOMMENDATIONS
OF MANUFACTURER.

71. Statutory Inspection
points:
S. No.
Location No.
Type of tower
Chimney
Coping
Missing bolt &
nuts
HR weld
Insulators
Arcing horns
Jumper bolt &
nuts
Jumpers
Vibration
Conductor
Earth wire
Earth wire bonds
Number plates
Danger boards
Phase plates
Step bolt & nuts
Protection wall
Ground
clearance
Tree clearance
Other remarks