TT, IT & TN Earthing System Explanation | Grounding Systems

IEC 60364 is the apex level document that informs the standards for LV Electrical installations around the world.
The IEC 60364 standard has defined three types of Earthing Systems, TT, IT, and TN systems. Each system has a different application.
All the earthing systems seem technical and difficult to understand. However, we have figured an easy way out! For a simple explanation of each type of earthing system, watch our video and select the right one for your project.
For further details read our blog - What does TT, IT & TN Earthing mean? - axis-india.com/2020/07/tt-it-...
Visit us at axis-india.com/ | Follow us on LinkedIn at bit.ly/AxisIndiaLinkedIn
0:00 Introduction
0:43 Earthing Systems
1:03 IEC Standard
2:37 TN SYSTEM
2:50 Explanation of Letters - TT, IT & TN
3:31 TT Earthing System
4:10 IT Earthing System
4:50 TN-S Earthing System
5:18 TN-C Earthing System
5:51 TN-C-S Earthing System
#Electricaltrainingvideos #Earthingsystem #Electricalsafety

[@mortezsiam]

Hello sir Thank you for your teaching, I have a Sollar INverter TN 3phase 400 is it possible to change it to IT 3 phase 230*3 if yes how do I do it?Thank you

[@30mAkills]

Here in Tamilnadu TT is used. Dangerous without RCD. Only last December 2022 EB woke up and said RCD is mandatory for new service.

[@AxisElectrical]

We agree Kishore!
Thanks for sharing your insights.

[@Imtiyaz5power]

Thanks Sir ❤️❤️❤️❤️

[@AxisElectrical]

Thank You.
We appreciate your response!

[@cywong1435]

sir , may i ask water heater can useing IT earthing system ?

[@AxisElectrical]

Hi Cy Wong,
It will depend on the earthing system provided by the utility. For further information, please connect with our experts at [e-mail].
Thank you for your interest!

[@Rohitmbmee]

1:39 can you please confirm that this document is only applicable to 50v or less?

[@AxisElectrical]

Hey Rohit,
IEC 60364 is applicable from low voltage to 1000V.

[@Crestpak1]

How to calculate size for Earthing in TT system?
Can we change Earthing system if existing is TT

[@AxisElectrical]

Hey,
The size for earthing is calculated based on the conductor sizing calculation. Also, why do you need to change the earthing system?

[@abhiramibiju8296]

Which system is normally used at
our premises

[@AxisElectrical]

Hi Abhirami,
Can you specify your premises?

[@surendrakverma555]

Thanks 🙏

[@AxisElectrical]

Glad you liked our video Surendra!

[@k.a.nsampath9094]

We want servo motor vedio sir

[@AxisElectrical]

Thank you for sharing your suggestion, we will work on it.

[@pendyna3171]

i want to full name TT IT TN

[@AxisElectrical]

The First Letter of each system refers to the power source from a star-connected winding.
The Second Letter refers to the consuming equipment that needs to be earthed.
From the ‘Handbook of Electrical Engineering: For Practitioners In The Oil, Gas And Petrochemical Industry’ by Alan L. Sheldrake
For the first letter, “T denotes that the start point of the source is solidly connected to earth, which is usually at a location very near to the winding.
I denote that the start point and the winding are isolated from earth. The start point is usually connected to an inductive impedance or resistance. Capacitive impedance is never used.”
And for the second letter, “T denotes that the consumer has solidly earthed independently of the source earthing method.
N denotes that a low impedance conductor is taken from the earth connection at the source and routed directly to the consumer for the specific purpose of earthing the consuming equipment.
S denotes that the neutral conductor routed from the source is separate from the protective earthing conductor, which is also routed from the source. This implies that five conductors need to be routed for a three-phase consumer.
C denotes that the neutral conductor and the protective earthing conductor are one and the same conductor. This means that four conductors need to be routed for a three-phase consumer.”
To put it in simpler terms:
T = Direct connection to the Earth, T stands for Terra meaning earth
I = Isolated
N = Neutral
S = Separate
C = Combine
You can get more details in our blog here:
axis-india.com/tt-it-tn-earthing-systems/

[@billmichae]

Keep longer diagrams as you speak and reduce your face time.

[@AxisElectrical]

Thank you for the feedback Bill, we appreciate it.

[@hejazzy3921]

Less movement of ur hands would be better! Not convinced by ur teaching style!

[@AxisElectrical]

Thank you for the feedback Jazzy!
We'll work on it.