RFI - Abbreviation for radio frequency interference.
RG - Abbreviation for Radio Frequency (Government). Prefix for many coaxial cables.
RHRW - Tinned copper conductors, rubber insulation, saturated braid, flame and moisture resistant finish for moist locations.
RHW - 75° C rubber insulated. Heat and moisture resistant insulation with an outer cover of moisture resistant, flame-retardant and a nonmetallic covering. Generally used in wet locations.
RIBBON CABLE - A flat cable with individually insulated conductors processed together in a parallel position. Conductors may be all in one color, or each individual conductor may be of a different color.
RIDGE MARKER - One or more ridges running laterally along the outer surface of plastic wire for purposes of identification.
RIGID COAXIAL CABLE - Non flexible coaxial cable, usually a metal tube armored coaxial cable.
RIGID WAVEGUIDE - A type of coaxial cable. A metal form (usually an extrusion) using air as a dielectric.
RIM Helix - Abbreviation for resin insulated magnet wire.
RIP CORD - A parallel construction of two or more insulated conductors which may be easily separated leaving the insulation of the conductors undisturbed.
RISER - A UL designation for cable approved to go from one floor to another floor in a multistory building.
RMS - Abbreviation for Root Mean Square. It is a means of expressing AC voltage in terms of DC. It is approximately 80% of AC peak voltage.
