Abstract
In the Netherlands, the government issued a precautionary policy for overhead power lines in
2005. Two pooled analyses by Ahlborn and by Greenland formed the basis for the Dutch
approach. The precautionary policy advises grid companies and municipalities to prevent new
situations where children will be exposed to magnetic field strengths above 0.4 microtesla, for
a prolonged period of time. New situations encompass construction of new power lines,
reconstruction of existing power lines and building of new dwellings, schools, creches and
day-care centres near existing power lines.
The magnetic field zone - defined as the area where the yearly averaged magnetic field
exceeds 0.4 microtesla now or may exceed 0.4 microtesla in the future - plays a central role in
the implementation of the policy. The Dutch National Institute for Public Health and the
Environment (RIVM) developed a guideline for the calculation of the width of this magnetic
field zone. Such a guideline requires a series of choices and simplifications of power line
parameters (conductor current, sag, earth wires). This presentation discusses these choices and
simplifications and the consequences for the width of the magnetic field zone.
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