SPEC 60420

Armorlite® Armored Thermostat Type MC

18 AWG TFN/TEWN Insulated Singles. Green Insulated Ground. UL Listed. 600 Volts. Rated VW-1. Steel Interlocked Armor.



  1. Conductor:19 strands class C compressed copper per ASTM B3 and ASTM B8
  2. Insulation:All phases are insulated with Polyvinyl Chloride with Nylon Sheath Type TFFN
  3. Ground:Green insulated ground. Polyvinyl Chloride with Nylon Sheath Type TFFN
  4. Binder:Paper tape
  5. Armor:Steel Interlocked Armor

Applications and Features:

Southwire Armorlite® Armored Thermostat Type MC Cable is suitable for use as follows:
  • Signal, control, branch, feeder and service power distribution in commercial, industrial, institutional, and multi-residential buildings.
  • Fished or embedded in plaster.
  • Concealed or exposed installations.
  • Environmental air-handling spaces per NEC 300.22 (C).
  • Places of Assembly per NEC 518.4 and theaters per NEC 520.5.
  • Installation in cable tray and approved raceways.
  • Under raised floors for information technology equipment conductors and cables per NEC Article 645
  • Class I Div. 2, Class II Div 2, & Class III Div. 1 Hazardous Locations.

  • Southwire Armorlite® Type MC Cable - meets or exceeds the following requirements:
  • UL Online Product Guide Info - Metal-Clad Cable (PJAZ) ( www.ul.com )
  • Federal Specification A-A59544 (formerly J-C-30B)
  • NFPA 70 (National Electrical Code), Article 330
  • Listed for use in UL 1, 2 and 3 Hour Through Penetration Firestop Systems
  • Specifications:

  • ASTM B3 Soft or Annealed Copper Wire
  • UL 66 Fixture Wire
  • UL 1569 Metal-Clad Cables
  • UL 1685 FT4 Vertical-Tray Fire Propagation and Smoke Release Test
  • IEEE 1202 FT4 Flame Test (70,000) BTU/hr Vertical Tray Test
  • RoHS-2 (European Directive 2011/65/EU)
  • Buy American: Compliant with Buy American Requirements, found in 49 U.S.C. § 5323(j); specify “Made in the USA Only!” when ordering to ensure your project receives American made products.
  • VW-1 (Vertical-Wire) Flame Test
  • Sample Print Legend:

    Table 1 – Weights and Measurements
    Stock NumberCond. SizeConductor NumberColorDiameter Over ConductorConductor StrandingInsulation ThicknessApprox. ODCopper WeightOverall Weight
    18 AWG | Solid
    553173182BK, WE0.040Solid150.386977
    553174183BK, RD, WE0.040Solid150.3861484
    553170184BK, RD BE, WE0.040Solid150.4191996
    553171185BK, RD BE, WE, GN0.040Solid150.44224109
    553169186BK, RD BE, WE, YW, GN0.040Solid150.44229116
    554763187BK, RD BE, WE, YW, BN, OE, GN0.040Solid150.46639135
    All dimensions are nominal and subject to normal manufacturing tolerances
    ◊ Cable marked with this symbol is a standard stock item
    Note: Conductor number = number of phase conductors plus neutral. Does not include green ground.
    Table 2 – Electrical and Engineering Data
    Cond. SizeConductor NumberMin. Bend RadiusDC Resistance at 25°CAC Resistance at 75°CInductive Reactance @ 60HzAllowable Ampacity Raceway 90°C
    18 AWG | Solid
    * Ampacities based upon 2023 NEC Table 310.16 and do not take into account the overcurrent protection limitations in NEC 240.4(D) of 15 Amps for 14 AWG CU, 20 Amps for 12 AWG CU, and 30 Amps for 10 AWG CU (independent of the conductor temperature rating and stranding if size is present in table). Also, see NEC sections 310.15 and 110.14(C) for additional requirements.
    * Ampacities have been adjusted for more than Three Current-Carrying Conductors.

    Revision: 1.000.008

    Updated On: May 13, 2024, 3:14 p.m. UTC