Insulation Material:
The insulation material shall be aromatic polyamide paper. The paper covering shall consist of one or more tapes, each of which shall be firmly, tightly, evenly and continuously wound around the wire and constructed to provide the specified number of tape layers (thickness of paper). The paper covering shall consist of at least two layers of paper with an overlap of not less than 40%.
Characteristic:
| Adhesion and flexibility: | The covering shall not loosen appreciably or open enough to expose the bare wire after being bent around a mandrel six times the thickness of the bare wire |
| Elongation | Not less than 32% for thicknesses 0.049 inches (1.25 mm) and above, and not less than 30% for thicknesses less than 0.049 inches (1.25 mm) |
| Springback | Not more than 5.5° |
| Dielectric breakdown | Not less than 300 V/mil (11800 V/mm) of the smallest thickness of the paper cover side (half the minimum increase) |
Table 3
Increase in Dimensions of Rectangular Wire Due to Tape Covering
| N | t = 0.0015 in (0.038 mm) | t = 0.002 in (.051 mm) | t = 0.003 in (.076 mm) | |||||||||
| Minimum | Maximum | Minimum | Maximum | Minimum | Maximum | |||||||
| Inches | mm | Inches | mm | Inches | mm | Inches | mm | Inches | mm | Inches | mm | |
| 2 | 0.005 | 0.127 | 0.009 | 0.229 | 0.007 | 0.178 | 0.012 | 0.305 | 0.010 | 0.254 | 0.018 | 0.457 |
| 3 | 0.008 | 0.203 | 0.012 | 0.305 | 0.010 | 0.254 | 0.016 | 0.406 | 0.015 | 0.381 | 0.024 | 0.610 |