There is a proposal to build houses in an area that has overhead lines (will find out what type) . They plan to underground the overhead lines and build "over" them. Are there regulations covering this? Or is it just a question of working out exposure to emf? If you can build OVER what about maintenance?
Hmm There will be a label on those pylons showing the voltage but lets just assume 275kV for now. Having just spent ten mins or so translating Perygle Marwolyth to 'peril of expiry' I'm not keen to continue.. I do not think it will tell me the voltage or grid or supergrid.
Such things go underground as one of three forms
1) Trough: the separate cores of the cable lie in a concrete trough, maybe as shallow as 0.3 m below ground, but also only 0.15 m apart.
At that voltage unfilled trench is rare, and likely to be deeper.
This is not for long runs or building over, but needed where feeders come to the surface to go into buildings, or perhaps running beside a railway, road or river or to hop over a bridge or up to surface into a transformer or switching station.
2) Direct buried: the separate cores of the cable are laid directly in the ground, for 11 and 33kV lines typically 1 m below ground and 0.3-0.5 m apart, for your sort of HV, deeper and fatter cables, and with concrete backfill.
Most likely under a road for the sort of situation you describe.
3) Tunnel: the cable is carried in a tunnel typically up to 20 m below the surface
Expensive but needed for example under London This can be built over.
This website has some pics illustrating the sort of thing, but the cable sizes are more for the 11kV and 33kV cables that supply local substations.
https://www.emfs.info/sources/underground/types/
Mike.
Hmm There will be a label on those pylons showing the voltage but lets just assume 275kV for now. Having just spent ten mins or so translating Perygle Marwolyth to 'peril of expiry' I'm not keen to continue.. I do not think it will tell me the voltage or grid or supergrid.
Such things go underground as one of three forms
1) Trough: the separate cores of the cable lie in a concrete trough, maybe as shallow as 0.3 m below ground, but also only 0.15 m apart.
At that voltage unfilled trench is rare, and likely to be deeper.
This is not for long runs or building over, but needed where feeders come to the surface to go into buildings, or perhaps running beside a railway, road or river or to hop over a bridge or up to surface into a transformer or switching station.
2) Direct buried: the separate cores of the cable are laid directly in the ground, for 11 and 33kV lines typically 1 m below ground and 0.3-0.5 m apart, for your sort of HV, deeper and fatter cables, and with concrete backfill.
Most likely under a road for the sort of situation you describe.
3) Tunnel: the cable is carried in a tunnel typically up to 20 m below the surface
Expensive but needed for example under London This can be built over.
This website has some pics illustrating the sort of thing, but the cable sizes are more for the 11kV and 33kV cables that supply local substations.
https://www.emfs.info/sources/underground/types/
Mike.
