Electrical Wiring Questions and Answers viva Interview

  • What are AC and DC supply?
  • What is an isolator?
  • What is called a main switch?
  • What is MCB?
  • What is ELCB?
  • What is RCCB?
  • ELCB or RCCB which is better to use in wiring? Why?
  • How to wire one lamp controlled by two switches?

What are the different types of wiring?

5 Different Types of Electrical House Wiring Systems

  • Cleat Wiring. This wiring comprises of PVC insulated wires or ordinary VIR that are braided and compounded. …
  • Casing and Capping Wiring. …
  • Batten Wiring. …
  • Lead Sheathed Wiring. …
  • Conduit Wiring.

What are the 4 types of wires?

Types of Wiring

  • Triplex wires.
  • Main feeder wires.
  • Panel feed wires.
  • Non-metallic sheathed wires.
  • Single strand wires.

What uses a fuse?

The fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that melts easily.

What is the name of wire joint?

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’s wiring diagram?

A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the power and signal connections between the devices.

Why earthing is done?

Earthing is used to protect you from an electric shock. It does this by providing a path (a protective conductor) for a fault current to flow to earth. It also causes the protective device (either a circuit-breaker or fuse) to switch off the electric current to the circuit that has the fault.

What are the two types of wires?

The two categories of single-conductor wires are solid and stranded (also called braided). Solid wire is rigid and conducts electricity better. Stranded wire consists of smaller wires braided together.

Does neutral wire have power?

Neutral wire carries the circuit back to the original power source. More specifically, neutral wire brings the circuit to a ground or busbar usually connected at the electrical panel. This gives currents circulation through your electrical system, which allows electricity to be fully utilized.

What is inside a wire?

An electrical wire is a type of conductor, which is a material that conducts electricity. In the case of household wiring, the conductor itself is usually copper or aluminum (or copper-sheathed aluminum) and is either a solid metal conductor or stranded wire.

What is the symbol of conductor?

Electric Wire or Conductor Symbol

It is symbolized by a straight line.

What is the function of switch?

In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another.

What is nm-b wire?

NM-B is a non-metallic electrical wire used in residential building wiring for various devices and outlets. It is mostly used in devices characterized as damp or wet, such as washing machines and dishwashers. It can also be applied in switches, tile walls, and lighting.

What is a 3C cable?

3C-2V is commonly marked on low cost coaxial cable used for domestic TV signals. It is one of the options of the Japanese cable standard JIS C 3501. The 3 indicates approx diameter of the conductive core plus the dielectric (diameter of conductive core =0.5 mm, dielectric thickness =1.3 mm)

What is UF wire?

UF Cable. ”UF” stands for underground feeder; rated for in-ground and damp-area installation. Looks like NM-B cable but the wires are embedded as a group in solid thermoplastic (rather than individually encased in flexible thermoplastic).

What is the difference between Romex and UFB?

UF (or Underground Feed) cable is necessary any time you’re laying cable underground. The wires in UF are individually insulated. They’re then wrapped together in more insulation for further protection from weather and sunlight. On the other hand, Romex® is wire coated in plastic and is only suitable for indoor use.

Can I put Romex in conduit?

No, you can not run your Romex wiring in conduits.

Why is UF-b cheaper than NM?

Currently, many big box stores have the UF-B marked less than the NM-B cable. That’s because the price is not as inflated from demand like NM-B. NM-B is also used more frequently because it is WAY easier to work with.