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IEC 60335-2-83 Ed. 1.0 b:2001
Household and similar electrical appliances - Safety - Part 2-83: Particular requirements for heated gullies for roof drainage
"Deals with the safety of electrically heated gullies for de-icing the inlet of the drainage system of flat roofs, balconies, and similar structures. The rated voltage is not more than 250 V."
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International Electrotechnical Commission [iec]