32A sockets the loop imedance should be less than 1.2 ohms, but if its a TT system how is it gona be below this? Is it ok to just give it an RCD for supplementary protection? Do the figures for max loop in regs not apply to TT systems?
TT Systems
- Thread starter New2Game
- Start date
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With a TT you normally install a 100mA TD RCD to protect the entire installation, and then a 30mA RCD to protect the sockets etc. (or 30mA RCBOs)
You therefor can have a much higher Zs as a fault to earth with a reading of 200 ohms will still trip the RCD (a fault current of 1.2A), but this is not allowed in a standard installation as that fault would not operate an MCB
Hope that made sense
You therefor can have a much higher Zs as a fault to earth with a reading of 200 ohms will still trip the RCD (a fault current of 1.2A), but this is not allowed in a standard installation as that fault would not operate an MCB
Hope that made sense
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