Secret behind shockless electricity

 Shockless electricity

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Shockless electricity could be achieved by isolating one circuit from another circuit.

Classification of isolation;

·        Optoisolator

·        Capacitor

·        Hall effect

·        Relay

·        Transformer


High resistance material


                                    Opto isolator

Opto-isolator transmits information by means of the light wave. The sender (source) and receiver (which is a photosensitive thing) are not connected electrically but typically they are held in place within a transparent, insulating plastic.



Capacitors always allow only alternating current (AC) to flow and blocks DC. Based on several conditions, a capacitor may fail/burst and become a "short circuit” which creates a risk to the "connected live circuit" and possibly may kill/injure humans. For safety isolation capacitors with a specific rating (pF) for specific applications must be used.


Hall effect

These sensors called Hall Effect Sensors allows an inductor(inductive coil) to transfer info in a small gap magnetically. Unlike optoisolators, hall effect sensors do not contain a constant light source, and while these sensors are connected with a transformer with specific rating, they(Hall Effect Sensors) do not require a DC balancing circuit.



Normally a relay consists of normally open, normally closed terminals. From the normally closed terminal, the magnetic coil is held. The other side is to switched contacts(connected to the live circuit).



Transformers work on the Electromagnetic induction principle which states by magnetic flux. The primary and secondary windings of a transformer are not connected to each other, they are wound on a core so the making a path for magnetic flux linking. 

The voltage difference that may be safely applied to windings without the risk of breakdown (the isolation voltage) is specified in voltage(kilovolts). The transformers are mainly used to change voltages ie: high to low & low to high, for safety applications, isolation transformers with a 1:1 ratio are used.


Isolation transformer

Galvanic isolation;

The principle of isolation of functional sections of electrical systems to prevent current flow is known as Galvanic isolation. There is no direct conduction path is permitted. Energy can still be exchanged between the sections by other means, such as electromagnetic waves, or by optical, capacitance, induction.

Galvanic isolation

where there is in need that two or more electric circuits must communicate Galvanic isolation is used, but with a condition that their ground may be at different potential(voltage). Galvanic isolation is an important technique of breaking the ground loops, which is achieved by preventing unwanted current to flow between any two electrical circuits that is sharing a ground conductor.

To prevent the current from reaching the ground via a human body accidentally Galvanic isolation is used.



    By reading this post which is an outline of shock-less electricity, by implementing this, it’s become easy to work in domestic as well as industrial electric faults.


Then why it's not implemented still!!!, because of the following reasons:

  • We need to keep an additional transformer for this setup.
  • Due to adding transformer it may produce lots of problems (high installation cost, At no-load condition the circuit consumes power via transformer...).


 Nowadays we are using traditional components such as MCB's, RCCB, ELCB, etc, instead of that transformer.


Advantages of traditional components are,  

  • The price is lesser than the isolation transformer.
  • there are no no-load losses.

Please feel free to share your opinions in the comment section below.

Also, share this article with your friends so they can know!


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