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BS7671 Wiring Regulations give different values for Zs Loop Impedance for Final Circuits and Distribution Circuits and there are reasons for this.
Selecting the wrong value can compromise the electrical health and safety of the buildings occupants and can put their lives at risk. The fire safety of the building may also be affected.
This short video will help you to correctly identify the two types of circuit and will make sure that you are working on the right side of Health and Safety Law.
To view this video, click on this link – https://www.youtube.com/watch?v=Jsqx7b9VdyM