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| Rating | 150 deg C, 300 Vac, Horizontal flame. |
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| Conductor | Minimum 0.0015 inch diameter Resistance Wire Alloy spirally applied around a glass "Aramid" fiber core with a minimum of 20 turns per inch. |
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| Insulation | Extruded SR, 60 mils minimum average thickness, 54 minimum thickness at any point. |
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| Covering | Same as for Type SF-2. |
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| Standard | Appliance Wiring Material UL 758. |
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| Marking | General. |
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| Use | Refrigerator Defrost Heater Wire where not subjected to flexing or motion. |
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