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Coil heaters and cable heaters contain a layered heating element. Resistance wire elements, such as a nickel-chromium alloy, produce heat. The element is electrically insulated to prevent faulting. A ...

2.4 times the stipulated safe exposure level nickel - 9.6 times safe levels chromium - 6.6 times safe levels The metals were thought to come from the heating element - but the tests showed they ...