The most common Armoured Cables used in buildings are known as AC90, RA90 and ACWU90.

In AC90 (Figure 6), copper conductor sizes #14 AWG to #10 AWG are solid, and have a rating of 600 volts. Sizes #8 AWG to #2 AWG, have stranded copper conductors and a rating of 1000 volts. The conductors are insulated with XLPE. Two, three or four conductors are cabled together with a bare copper solid or stranded bonding (grounding) conductor, and bound with a suitable binder tape. Usually, aluminum interlocked armour is then applied over the cabled core.

Applications for AC90 are exposed or concealed wiring in dry locations only. They may be installed in ventilated, non-ventilated and ladder type cable trays, and for service entrance above ground.

RA90 is Aluminum Sheathed Cable (Figure 5). A continuous welded or seamless corrugated aluminum sheath is formed over the core, and bonding (grounding) is achieved through this sheath. A PVC jacket may be extruded over the aluminum sheath as an option.

Applications for Unjacketed RA90, are similar to those for AC90. Applications for Jacketed RA90 are exposed and concealed wiring in dry, damp, or wet locations, and it may be installed in ventilated, non-ventilated and ladder-type cable trays. Jacketed cables are also used for direct earth burial providing that protection is provided as required by the inspection authority, and for service entrance above or below ground.