Intended for healthcare professionals


Childhood cancer in relation to distance from high voltage power lines in England and Wales: a case-control study

BMJ 2005; 330 doi: (Published 02 June 2005) Cite this as: BMJ 2005;330:1290

Fields from Transit System

If Bonnie McKinnon reads this, the flux densities she has seen, with
15 mG at the house, are consistent with a three-rail transit railway [ no
overhead cables ] with a typical load of 1000 amps at a distance of 10
metres, thirty feet. This is a dc field and I know of no suggestion that
dc or slowly varying fields affect health. Draper et al were reporting on
ac fields from ac overhead power lines.

Competing interests:
None declared

Competing interests: No competing interests

29 June 2005
Donald S Amstrong
EMC consultnat
Derby DE56 4BY