The Benefits of Using earth wire suspension clamp

Easy installation: The wire clamp can be quickly installed on site without any special tools, and the operation can be completed by one person;

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High grip: Generally, each wire clamp has a grip margin to ensure that the clamp's grip on the wire can reach more than 100% of the rated breaking force of the wire;

Strong versatility: Suitable for a variety of wires and ground wires, and can be used with a variety of hardware;

High installation quality feasibility: The installation quality of the wire clamp is easy to ensure, with high consistency, and no special tools are required for measurement, and it can be checked with the naked eye;

High corrosion resistance: Fuse Link is basically consistent with the wire material to ensure that no electrochemical corrosion occurs.

Suspension Clamp Assembly

• Suspension clamps are used at all suspension points to support the earth wire. The clamps shall conform to IS: and shall give adequate are of support to the earth wire. The groove of the clamp should be smooth finished in uniform circular or oval shape so that there shall not be any displacement in configuration of the earth wire strands nor shall these be unduly stressed in final assembly.
• The following types of suspension clamp are in use :-
  • Conventional type :-
    This type of suspension clamp shall hang from U-bolt which is fixed vertically downwards in the ground wire peak of suspension tower. The U-bolt is part of the tower and is fixed in the direction of the run of line.
  • Seated Type :-
    This type of suspension clamp is fixed with the help of 4 nos 16 diax40mm bolts on the base provided at the ground wire peak of suspension tower.

• Technical Particulars of Suspension Clamps

1. Dimensional details :

TABLE 17-I

Clamp suitable for earth wire size DIMENSION (mm) Free centre Type Seated Type A B C D A B C D E

7/3.67 mm

180 135 16 12 130 90 190 62 10 7/3.25 mm 180 135 16 12 - - - - -

 

7/3.67mm Earth wire 7/3.25mm Earth wire 2. Indian standard to which suspension clamp shall conform ---------IS: part I--------- 3. UTS of earth wire Kg Kg 4. Minimum failing load of suspension clamp (shall not be less than breaking load of earth wire) Kg Kg 5. Minimum slip strength of suspension clamp with respect to earth wire (shall not be less than 25% of earth wire UTS) Kg Kg 6. Total weight of assembly (approx)  

1. Conventional Type

2.5 Kg 2.5 Kg  

2. Seated type

3.5 Kg --

Tension Clamp Assemble

• The compression type tension clamp is used at all the tension towers to hold 7/3.67mm and 7/3.25 mm GS earth wire. The assembly is connected to 22/20.5mm dia hole in 8mm thick horizontal strain plates of the tower body by means of D-Shackle. The jumper terminal attachment plate is welded with dead and at an angle of 300 C from the vertical plane. The jumper terminal is fixed with attachment plate by means of bolts & nuts. The compression tube and jumper tube give adequate area of support without any slip to the earth wire under normal working tension and vibration conditions.

• Technical Particulars

(1)

If you are looking for more details, kindly visit earth wire suspension clamp.

TABLE 17-II

Clamp suitable for earth wire size DIMENSION (mm) A B C D A B C D E 7/3.67 mm 70 240 125 16 16 60 11.5 21 17.5 7/3.25 mm 70 230 110 16 16 60 10.3 18 15.1

 

7/3.67mm Earth wire 7/3.25mm Earth wire 2. Indian standard to which tension clamp shall conform ---------IS: part I--------- 3. UTS of earth wire Kg Kg 4. Minimum ultimate breaking strength of dead end clamp after compression (shall not be less than 95% of UTS of earth wire) Kg Kg 5 Minimum slip strength of dead end clamp after compression (shall not be less than 95% of UTS of earth wire) Kg Kg

MID-Span Compression Joint for Earth Wire

• These joints are used for jointing two length of 7/3.67mm and 7/3.25mm GS earth wire. These are made of mild steel rods such that it does not crack or fail during compression. It shall be easily compressible with 100 ton hydraulic compressor.

• Technical Particulars :

1.

TABLE 17-III

Suitable for earth wire size Dimensions (mm) Before compression After compression Length Internal Dia External Dia Length Corner to Corner Face to Face 7/3.67mm 230 11.5 21 250 20 17.5 7/3.25mm 203 10.3 18 220 17.4 15.1

2. ndian Standard to which Mid Span joints shall conform IS:

3. Material of construction-mild steel (hot dip galvanized)

4. The ultimate breaking strength and slip strength of the joint after compression Not less than 90% of UTS of earthwire.

• UTS of earth wire
• 7/3.67mm -Kg
• 7/3.25mm - Kg

Vibration dampers suitable for 7/3.67mm earth wire are provided at all tension and suspension points of each earth wire in each span (at least one at each end of each earth wire span up to span of 450 meter) to damp out the vibration up to a residual limit of 150 micro strains. The dampers shall effectively damp out the vibration of earth wire for full frequency range experienced in the earth wire for spans from 200 to 450 meters and wind velocity up to 30 Kms per hour.

• Technical Particulars :

1. Vibration dampers shall conform to IS: 2. Materials  

1. (a) Clamp

Aluminium alloy die cost  

2. (b) Damper mass

Cast Iron  

3. (c) Messenger Cable

High Tensile steel (19 strands)  

4. (d) Bolt & Oawher

Mild steel 3. (3) Pull off strength of masses with respect of messenger cable 500 Kgs 4. Slip Strength of clamp with respect to earth wire 250 Kg 5. Maximum permissible dynamic strain 150 micro strains 6. Minimum fatigue strength at an amplitude of + 0.5mm 10 million cycles 7. Clamping torque 5 Kg meter 8. UTS of messenger cable 135 Kg/mm2

Placement chart :

TABLE 17-IV

Span (Meter) Tension (Kg) Position of Damper (Meters) Suspension Tension 1st 2nd 1st 2nd 0-250 up to 0.60 - 0.60 1.20 251-350 up to 0.60 - 0.60 1.20 351-500 up to 0.65 - 0.65 1.30 501-600 up to 0.70 - 0.70 1.40 601-800 up to 0.70 1.40 0.70 1.40

Distances of damper are to be measured from centre line of suspension clamp or mouth of dead end assembly up to centre of damper clamp.

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