Standard for single- and multiple-conductor power-limited circuit cables for use as fixed wiring within buildings (some are also marked for direct burial) principally for Class 3 and Class 2 circuits as described in Article 725 and other applicable parts of the US National Electrical Code (NEC).
Electrical and composite electrical/optical-fiber cables are intended for use (optical and electrical functions associated in the case of a hybrid cable) on circuits rated 150 V or less and 5 A or less in accordance with Article 727 and other applicable parts of the US National Electrical Code (NEC).
The most widely used insulating materials today are cross-linked polyethylene, polyethylene, and polyvinylchloride.
Selection criteria for insulation materials are electrical transmission properties, characteristics in case of fire, temperature rating. Other criteria as special connection techniques, resistance to oil and gas, resistance to radiation and/or compatibility with filling compounds can also be significant in certain special cases.
Common types with PVC sheath, in different temperature ratings (70 °C; 90 °C; 105 °C). The choice of the most suitable type of armor depends on the demands of installation and operation.
In addition, local and legal regulations must be complied with. The most important selection criteria are maximum expected tensile load and minimum required load-bearing capacity during installation and/or operation, maximum expected pressure and tensile load after laying, protection against attack by rodents, minimum required bending radius and protection against external interferences.
- UL Common 300 V
- Armored and unarmored
- PVC / PVC
- XLPE / PVC
- *IEEE 1580 / UL 1309