- Joined
- 27 Jan 2008
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Multi-earths
When wiring a radio shack using a 3KV isolation transformer for supply and TT at the shack (shed) there was no real problem as it was away from the house but now want to make bedroom into a shack and not sure on earths.
1) Should I re-pipe the radiator in plastic to remove any PME bonded items?
2) Should I re-wire lights to take supply from transformer again to remove PME bonded items? (Lamp will be class II only rose will have earth)
3) Is there any monitoring equipment to show if there is a dangerous differential between TT earth and PME earth.
It is intended to run the main supply cable from the garage (part of house) where the transformer would be out side the house to an isolator about 6’ high so the licensing authority can isolate without entering the house so as to comply with unattended operation regulations and then into bedroom to all sockets in that room so all are at the same earth potential. And no socket within 1.25 meters of the door.
Would I need to fit a lock on the door my wife is not licensed but my son is and he is also a “Competent person” as am I and my wife would be “Instructed person”.
The aerial mast is another issue outside the window. I was told one should construct a spark gap and some very high resistances is parallel with the spark gap so any atmospheric voltages would leak away and if the voltages get too high it will discharge on spark gap.
1) Is there anything like a gold leaf electroscope which can be used to show when it is safe to reconnect aerial leads after an electrical storm?
2) Can I use the spark gaps built into master telephone sockets as my spark gap for aerial.
Final I know one should not switch earths but could I put an isolator to join both earths when HF radio is not being used it would not be removing earth only bonding two together of course in 10mm or above earth cable.
Eric
When wiring a radio shack using a 3KV isolation transformer for supply and TT at the shack (shed) there was no real problem as it was away from the house but now want to make bedroom into a shack and not sure on earths.
1) Should I re-pipe the radiator in plastic to remove any PME bonded items?
2) Should I re-wire lights to take supply from transformer again to remove PME bonded items? (Lamp will be class II only rose will have earth)
3) Is there any monitoring equipment to show if there is a dangerous differential between TT earth and PME earth.
It is intended to run the main supply cable from the garage (part of house) where the transformer would be out side the house to an isolator about 6’ high so the licensing authority can isolate without entering the house so as to comply with unattended operation regulations and then into bedroom to all sockets in that room so all are at the same earth potential. And no socket within 1.25 meters of the door.
Would I need to fit a lock on the door my wife is not licensed but my son is and he is also a “Competent person” as am I and my wife would be “Instructed person”.
The aerial mast is another issue outside the window. I was told one should construct a spark gap and some very high resistances is parallel with the spark gap so any atmospheric voltages would leak away and if the voltages get too high it will discharge on spark gap.
1) Is there anything like a gold leaf electroscope which can be used to show when it is safe to reconnect aerial leads after an electrical storm?
2) Can I use the spark gaps built into master telephone sockets as my spark gap for aerial.
Final I know one should not switch earths but could I put an isolator to join both earths when HF radio is not being used it would not be removing earth only bonding two together of course in 10mm or above earth cable.
Eric
