Both mechanistic and epidemiology studies indicate
chrysotile asbestos has a threshold below which it does not cause
mesothelioma or
lung cancer. We conducted a critical review to determine whether electricians are at increased risk for these
cancers and, if so, whether their exposure to
chrysotile in electrical products could be responsible. We found that most, but not all, epidemiology studies indicate electricians are at increased risk for both
cancers. Studies that evaluated electricians' exposure to
asbestos during normal work tasks have generally reported low concentrations in air; an experimental study showed that grinding or drilling products containing encapsulated
chrysotile resulted in exposures to
chrysotile fibers far below the OSHA permissible exposure limit and the
cancer no observed adverse effect level. Studies of other craftsmen who often work in the vicinity of electricians, such as insulators, reported
asbestos (including
amphibole) exposures that were relatively high. Overall, the evidence does not indicate that exposure to
chrysotile in electrical products causes
mesothelioma or
lung cancer in electricians. Rather, the most likely cause of
lung cancer in electricians is smoking, and the most likely cause of
mesothelioma is exposure to
amphibole asbestos as a result of renovation/demolition work or working in the proximity of other skilled craftsmen.