For the integrity of the electrical circuit in any electrical network, one must use joints that have good strength. More importantly, the wires must be insulated through dependable insulators so that there is no short circuit when there is an overload in the circuit.
High utility of silicone insulators
In most of the Silicone Insulators used today, the material used has changed from ceramic to polymer and for a good reason. The new-age polymers are light and have strength as much as 70-80% more than the ceramic models. They weigh on a comparative scale 67-76% lesser. Silicone rubber sheds give an excellent hydrophobic workmanship. These are also very resistant to tracking and erosion. Thereby, they have a long life.
They find extensive use due to their stable working under inclement conditions. The surface hydrophobicity of the unit remains with it for a long time due to the way it is manufactured. It works perfectly in polluted atmospheric conditions and even salty environments without undergoing any damage or affecting the performance.
Long life assured
Due to their high resistance to breakage, they are relatively safe from pilferage and vandalism. They have high mechanical strength that adds to the long life. The light weight makes the installation work easier. You need only lighter equipment on site for the installation. Choosing a model that is compliant with the industry standards helps keep up the safety of the network.
Types of composite insulators
Composite silicone insulators have a pultruded fibreglass rod to house this insulator. Galvanised steel or aluminium fitting find use for securing the ends of the rod. One may also use ethylene vinyl acetate as the housing material. The integral types of insulators would be these:
- a) Pin type composite insulators
- b) Suspension long rod silicone-rubber insulators
- c) Station post polymer insulators
- d) Polymer disc insulators
- e) Polymer strain insulators
- f) Cross arm silicone rubber insulators
Types of cable accessories
On the other end of the scale, we have the Power cable accessories that makes the connections secure from the inside. These consist of connectors and jointing solutions. These are the common ones in use:
- a) Shear bolt connectors
- b) Separable connectors
- c) Jointing accessories
- d) Cable terminations
- e) Cable joints
- f) Cable lugs
Shear bolt connectors
The shear bolt connectors are useful due to the shear-off head bolts and transfer grooving. This eliminates the need for a torque wrench since the heads will all fall off when the needed strength is attained in the joint. These are mechanical connectors and used in places where one needs to maintain the perfect strength tolerance for maximising stability.
Cable lugs usefulness
The cable lugs are made of pre-rounded sector shaped connectors. The metal used for the lug may be copper or bimetal. Aluminium is used commonly to fashion these connectors. It has a hole to facilitate easy connectivity. They have a screw end so that the cable can be inserted without any complications. Many of them have markings to facilitate correct crimping. In humid areas, the connections are made using aluminium and copper washers. These connections do not take up tension.
Other than these, you have the various cable joints such as the heat shrink cable joints, cold type of joints, slip-on joints, push-on, and pre-moulded joints.