How do you do cable jointing?
How do you do cable jointing?
Bring the two conductors to a crossed position and then make a long bend or twist in each wire. 3. Wrap the end of one of the wires around the straight portion of the other wire, and then do the same for the other wire. Repeat this for about four or five times.
What is cable jointing and termination?
A joint structure for covering a joint between cables is provided in which an insulation structure extends over and beyond cut back ends of insulation layers of the cables, but terminates at a distance ahead of cut back ends of insulation shield layers of the cables.
Which method of cable joint is used for LV cables?
Straight-through joints low voltage RELICON i-Line straight-through joints are made for installations in low-voltage electrical networks. This cable jointing is suitable for jointing on polymeric cables and wires made of PVC, XLPE, PE, EPR and utility cables.
What precautions are necessary in cable jointing?
The copper screen of each core should be shorted to armour tightly and perfectly. There should not be any loose connection. Direction of flame of torch should be in shrink direction. The tubes should not be exposed to flame at one single point.
What is cable jointing?
Cable joints are used to connect low voltage, medium voltage and high voltage cables. The jointing insulation and shroud applied over the conductors must be compatible with the cable materials and may include heat or cold shrinkable insulations, moulded types or special tapes.
How many types of HT cables are there?
Medium and High Tension Cables 2. Super tension (ST) cables for 22 kV and 33 kV levels which are screened cables. 3. Extra high tension (EHT) cables for voltage levels from 33 kV to 66 kV which are pressure cables.
Why are cable termination kits used?
Cable terminations are designed to terminate and connect 11kV/33kV cables into medium or high voltage electrical equipment including switchgear, transformer, motor, enclosure or pole-top mounted for overhead line distribution networks.
What are the different methods in terminating and connecting wires?
Wire Termination Uses and Methods
- Soldering. Soldering has been around since about 3,000 BC.
- Insulation Displacement Connections. Insulation displacement connectors (IDC) are probably the fastest way to terminate wires.
- Ultrasonic Welding.
- Standardization of Quality.
How many types of cable joint do we have?
Three Types Of Cable Joints There are three main types of electrical joints, also known as splices: The Western Union splice, the tap splice and the fixture splice. The Western Union splice connects two conductors together and is particularly useful in repairing a broken wire.
What is the name of the cable laying method?
There are five different methods of laying cables e.g. (a) Laying direct in ground, (b) Drawing in ducts, (c) Laying on racks in air, (d) Laying on racks inside a cable tunnel and (e) Laying along buildings or structures.
How is cross bonding achieved in a 132kV link box?
Typically, the HV cables are sectionalised into 3 equal length sections and cross bonding is achieved within the link box. Pictured: Typical layout of 132kV Joint Day design with location of link box pit and bonding cables positioned.
Why is 132kV XLPE used in underground cables?
Underground cable bonding systems utilising 132kV XLPE insulated HV power cables are designed to provide cable sheath bonding to eliminate or reduce the circulating sheath currents and limit standing induced cable sheath voltages for safety reasons.
What kind of bonding leads do I need for HV cable?
Thorne & Derrick can also supply Sheath Voltage Limiters to suit the HV cable system bonding arrangement as well as Normal Bonding Leads, Concentric Bonding Leads and High Voltage Earthing Kits for connection between the link box and the cable accessory.
What is the voltage of a buried link box?
The Registration covers wall-mounted and buried link box types, across the voltage range 132kV – 400kV and is supported by authoritative test data from the IPH GmbH high voltage laboratories.