Electric cable that withstands electric arc propagation
US7750246B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2008 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Dec 25, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B3/306
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric cable includes an electrical conductor surrounded by a first layer of mica tape made up of mica particles deposited by means of a polymer binder on a backing, a second layer of a polyimide tape, and a third layer of a polytetrafluoroethylene tape, where the first layer is subjected to heat treatment at a temperature of at least 400° C. and the ratio R of the weight per unit length of PTFE over the sum of the weights per unit length of the polymer binder and of the polyimide is such that R is greater than or equal to 2 when the section of the electrical conductor is no greater than 0.2 mm2, R is greater than or equal to 4 when the section of the electrical conductor is strictly greater than 0.2 mm2 and strictly less than 0.6 mm2, R is greater than or equal to 6 when the section of the electrical conductor is equal to 0.6 mm2, and R is greater than or equal to 12 when the section of the electrical conductor is strictly greater than 0.6 mm2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.