Measurement equipment
Magnetic field measurement device including probes adjusted to 50Hz and 60Hz, calibrated according to IEEE std 644-1994 and approved by the Ministry of the Environment (MOE).Electric field measurement device including probes adjusted to 50Hz and 60Hz, calibrated according to IEEE std 644-1994 and approved by the Ministry of the Environment (MOE).
Measurement methods.
Measurement locations criteria:
In open area:
- Choose measurement locations wherever the highest magnetic field was found (according to a short term magnetic field measurement scan).
- For power lines of all kinds choose measurement locations at the power line ground axis and at the nearest populated area to the power line including the nearest entrance to a populated building.
- Choose other measurement locations as follows:
For medium power lines, choose locations following a grid of 2m from the power line ground axis on both sides.
For high and extra high power lines, choose locations following a grid of 5 m from the power line ground axis on both sides.
For sub stations and switching stations, choose locations following a grid of 1 m from the fence around the station and at the exit and entrance of the power lines cable.
For compact transformer stations, distribution cabinets and other electricity cabinets, choose locations following a grid of 0.5 m around the power source.
In buildings:
- Choose measurement locations wherever the highest magnetic field is found (according to a short magnetic field measurement scan).
- In populated rooms, choose locations at room center and at any continuously populated areas (e.g., work desks, beds).
- To characterize magnetic fields from external ELF sources, choose locations where the influence from other indoor ELF source (such as home appliances) will be minimal.
- For power lines of all kinds, choose measurement locations closest to the power line direction in the building/room.
- For indoor transformers rooms, distribution cabinets and other electricity cabinets in buildings, choose locations following a grid of 0.5 m around the power source including above and under transformer rooms if possible