While PME systems generally have a very low earth resistance (<1 Ohm), TT systems with a single earth rod are likely to be much higher resistance (say 15 Ohm) and so additional earth spike networks could really make a difference and bring this figure down as Marco has found.
I do wonder about the impedance of these earthing systems to noise signals on the 0v/earth line at audio and higher frequencies as this could impact system sound quality especially on source equipment where the signal voltages are lower. My guess is that standard twin and earth cables (which use a smaller cross section conductor for the protective earth vs the L and N conductors) will not offer the best low impedance route to earth for audio and higher frequency noise signals.
Certainly Twin and Earth cable isn’t designed to have low impedance at high frequencies - whereas lightning conductors (flat strip) are. I’m wondering if an earthing cable and spike network designed for higher frequencies using copper strip, conductive concrete etc would make a noticeable difference. Obviously this would need to be bonded and meet the regs.
I’ve also wondered about using thick coax (WT125) to connect a 0v line to a stainless steel earth plate lowered into my well - probably much cheaper than a load of earth grounding boxes!
Has anyone done any measurement or analysis of noise voltages on earth conductors that might save me the effort of actually getting the digger out and installing some of these?
Thanks Bill
I do wonder about the impedance of these earthing systems to noise signals on the 0v/earth line at audio and higher frequencies as this could impact system sound quality especially on source equipment where the signal voltages are lower. My guess is that standard twin and earth cables (which use a smaller cross section conductor for the protective earth vs the L and N conductors) will not offer the best low impedance route to earth for audio and higher frequency noise signals.
Certainly Twin and Earth cable isn’t designed to have low impedance at high frequencies - whereas lightning conductors (flat strip) are. I’m wondering if an earthing cable and spike network designed for higher frequencies using copper strip, conductive concrete etc would make a noticeable difference. Obviously this would need to be bonded and meet the regs.
I’ve also wondered about using thick coax (WT125) to connect a 0v line to a stainless steel earth plate lowered into my well - probably much cheaper than a load of earth grounding boxes!
Has anyone done any measurement or analysis of noise voltages on earth conductors that might save me the effort of actually getting the digger out and installing some of these?
Thanks Bill