The magnetic fields
in the house, with the electricity switched off, should be as low as possible and
are usually less than the UK average of 0.04 microtelsa (μT). For detached
houses set back from the road, the average fields from outside sources is about
0.02 μT. For flats and for terraced houses right up to the pavement have higher
fields, however if they are about about 0.1 μT then an external electrical
supply fault should be suspected.
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