Armored Electrical Cable

The National Electrical Code defines this as “fabricated assembly of insulated conductors in a flexible metallic enclosure”. These are composed of either aluminum or steel, insulated by thermosetting material (AC type) or Thermoplastic material (ATC type). When the armored cable is covered by insulation, the conductors need at least a 90° C and ampacity of 60° C. Most armored cables being shipped today are 90° C type ACTHH. Usage:

1. It may be used on circuits or feeders with no more than 600 volts.
2. May be passed through walls and partitions.
3. May be embedded on the finish of masonry walls.
4. If the cable is not passed through walls and/or ceilings it is required to be secured within 12 inches from every outlet box or fitting, with intervals of no more than 4 ½ feet.
5. May be used when building is more then three floors above grade.
6. For securing in accessible attics the cable must run parallel to the sides of joists, rafters, and studs. Otherwise guard strips or running boards would need to be installed.