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What is Casing Capping Wiring – Installation, Advantages, Disadvantages

Casing Capping is one of the oldest wiring systems and has been very popular and frequently used. Even in today’s world, post introduction of conduit or sheathed wiring systems, it is still a preferred wiring system. This post will discuss what is Casing Capping Wiring, its installation procedure, types of joints, 2 way and 3 way design, advantages and disadvantages.

What is Casing Capping

The process of connecting different accessories for distributing electrical energy from supplier to home appliances such as lamps, fans and other domestic appliances is known as Electrical Wiring. It is one of the simplest forms of electric wiring systems.

PVC insulated wires are placed in the plastic casing and covered with a cap, hence the name ‘Casing Capping’. Casing is a rectangular strip where the cables run through it having grooves.

Various Types of Casing Capping

Fig. 1 – Various Types of Casing Capping

The standard length of ‘case and cap’ is 1 meter and are available in size of 1.5 inch in width and 0.8 inch in thickness. The durability of this wiring system is 20 years approximately. It is mostly used in Home and Office spaces. Sheathed wiring systems are used for industrial purpose as it provides double insulation.

Casing and Capping 2-Way 3-Way Design

Fig. 2 – Casing Capping 2-Way 3-Way Design

Casing Capping Wiring Installation

Before installing, a 3mm round insulator is used between casing and the wall to prevent the humidity of the wall affecting the casing.

The next step involves grooving the surface with a width of ¼ inch which is available in 2-way and 3-way design.

Casing Capping Installation

Fig. 3 – Casing Capping Installation

The screws are drilled into Casing at a distance of 30 cm to each other.

This wiring can be installed in both vertical and horizontal positions. Different types of joints are used in this type of wiring system such as T joint, L-joint and Bridge joint etc.

Types of Joints Used in Casing Capping

Fig. 4 – Types of Joints Used

Advantages of Casing Capping Wiring

The advantages of this wiring are: –

  • This wiring system is way cheaper than sheathed and conduit wiring systems.
  • It is considered safe from smoke, dampness and humidity.
  • Customized installation can be done in this wiring system.
  • Reduced risk of electric shock can be expected.
  • Repairing becomes very easy if phase and neutral wire is installed in separate slots.

Disadvantages of Casing Capping Wiring

The disadvantages of this wiring are: –

  • There is a risk of major fire due to short circuits because of plastic in this wiring system.
  • This wiring system is not suitable in acidic conditions in industries.
  • Difficulty in finding any fault caused in the wire.
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Madhuri is a B.E (Computer science) and has experience in IBM as Software engineer. She is an Author, Editor and Partner at
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