How to choose an internal power line cable - WLZ for a single-family house or a single apartment. Step by step I will show the theory, formulas and examples of how to perform calculations. There will also be practical advice.
There will be design current, long-term current endurance, voltage drops, automatic power off, and minimum cross-sections.
The video is intended for beginners - so there will be simplifications and basics. The topic is extensive and it is impossible to show all aspects in a short film.
Remember that design work should be performed by people with appropriate qualifications and authorizations.
0:00 introduction and general information
1:13 Data needed
1:36 Cable selection criteria
1:54 Minimum cross-sections of veins
3:04 Long-term current carrying capacity
3:40 Design current
3:46 Conditions of Connection - source of important data
4:18 Current calculations for one and three phases
4:54 Special cases
5:15 Table with long-term current carrying capacity - for aluminum and copper
5:21 Ways to lay the cable
5:55 Correction factors
6:21 Condition of long-term current withstand
6:33 Practical notes
6:55 Aluminum and copper - cross-sections
7:20 Aluminum and copper - practical differences
7:34 Long-term current withstand - example 1
8:12 PEN and minimum cross-sections
8:30 Long-term current withstand - example 2
9:08 Long-term current withstand - example 3
9:49 Voltage drops
10:36 Voltage drops - old standards
10:52 Condition for automatic switching off of the SWZ power supply
11:22 Main protection without short-circuit element
11:46 Maximum fault loop impedance
12:07 Network impedance and WLZ
12:32 Shutdown voltage
12:45 Condition of automatic power off - check
12:52 Condition not met - what next?
13:39 Plans for the future
13:54 End
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