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Hi just looked at a test result given on electrical installation cert to a friend for an install and wandered should alarm bells be ringing?
R1+R2 = 0.41 ohms
R2 = 0.21 ohms
Zs = 0.2 ohms
Now I thought Zs was obtained by Ze + (R1+R2)
So I don't know how they arrived at 0.2 for Zs am i missing something?
would it make any difference if it were TT or TN-S supply?
Any help to clarify greatly appreciated
Thanks
R1+R2 = 0.41 ohms
R2 = 0.21 ohms
Zs = 0.2 ohms
Now I thought Zs was obtained by Ze + (R1+R2)
So I don't know how they arrived at 0.2 for Zs am i missing something?
would it make any difference if it were TT or TN-S supply?
Any help to clarify greatly appreciated
Thanks