This standard applies to general@ testing@ marking@ and documentation requirements for impedance heating systems for steel or steel alloy pipe or equipment@ rated up to and including 132 Vac. These heating system components are intended for installation in accordance with CSA C22.1@ Canadian Electrical Code@ Part I (CE Code); NFPA 70@ National Electrical Code? (NEC?) in the USA; or with any other national electrical installation code@ as applicable.1 Purpose This standard provides testing@ marking@ design@ and documentation requirements for impedance heating system components. Impedance heating systems that follow the component requirements as outlined here are intended to: a) Maintain design temperature; and b) Provide electrical@ thermal@ and mechanical durability and reliability.