In this video I will discuss the network and installation layout of TN-C, TN-S, TN-C-S and TT. I will also mention IT. I will talk about their structure, decipher their letter markings, show their differences, advantages and disadvantages, and discuss protection against electric shock.
From scratch! For beginners and more! With particular emphasis on electricity consumers!
The film is aimed at people who want to:
- Understand the differences between TN-C, TN-S, TN-C-S, TT and IT systems
- Get to know the structure of the network
- learn the meaning of letter symbols
- Learn the rules of protection against electric shock
- Gain knowledge about the L-PE short-circuit loop
I invite you to watch!
0:00 Introduction
0:28 What are network layouts? What do they influence?
1:07 Letter symbols - first letter, definitions
1:32 Connection with the earth in practice
2:02 Second letter - definitions
2:11 Practical aspects of enclosure grounding
3:18 Additional markings in TN
4:32 Where does the information about the network layout come from?
4:46 Consequences resulting from the network layout - the second letter in practice
5:09 Connection of enclosures to ground in various arrangements - introduction to protection against electric shock
6:17 protection against electric shock - TN - short-circuit loop, short-circuit current, devices
6:49 Example of calculation of max IPZ L-PE for TN
7:12 Double role of circuit breakers in TN-C
7:38 Security in TN-S and TN-C-S
8:00 Earthing resistance and network system
8:12 Protection against electric shock in TT - L-PE short-circuit loop, earth,
8:52 Why 2 RCDs?
9:31 Once again about the grounding in TT - it's important!
9:57 Dangerous voltage and switch-off times in TT and TN
10:11 Important issue for TN and TT!
10:20 Why is it worth having a grounded PEN split point, even though it is not required?
10:57 Recognition of the network layout
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I invite you to:
👉 www.naprawa-laptopa.com.pl - over 100 articles about laptop and electronics repairs!
👉 www.smarthomekr.pl - website about electricity and home automation.