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BackTypes of Conductor Insulation
| Trade Name | Type Letter | Where used |
|---|---|---|
| Code rubber | R | General use |
| Heat-resistant rubber | RH | General use |
| Moisture-resistant rubber | RW | General use and wet locations |
| Thermoplastic | T | General use |
| Moisture-resistant thermoplastic | TW | General use and wet locations |
| Weatherproof | WP | Wet locations; inside open wiring by special permission |
| Underground cable | UF | Suitable for direct burial in the earth and general use |
| Range cable | SR, SRT | Rubber or neoprene or thermoplastic cover; suitable for damp places |
| Service-entrance cable | ASE, SE, USE | Used as service-entrance conductors, range, clothes drier, and some water heaters |
| Mineral insulation | MI | General use and wet locations |