Article 332 Mineral-Insulated, Metal-Sheathed Cable Type MI

I. General

332.1	Scope
332.2	Definition

Type MI cable is factory assembled with one or more conductors using a highly compressed refractory mineral insulation. The entire assembly is covered with a gastight and liquidtight continuous copper or alloy steel sheath.

II. Installation

332.10

Uses Permitted

It can be used for services, feeders, and branch circuits; power, control, lighting, and signal circuits; wet, dry, or continuously moist locations; exposed or concealed; indoors and outdoors; embedded in concrete, plaster, fill, and other masonry; hazardous locations; underground when protected; corrosive locations that will not harm the sheath; where exposed to gasoline and oil, in or attached to cable trays and in underground runs when protected against corrosion or physical damage.

332.12

Uses Not Permitted

Where exposed to corrosive materials that will harm the sheath unless it is properly protected and in underground runs unless it is protected against physical damage.

332.17	Through or Parallel to Framing Members
332.24	Bending Radius
332.30	Securing and Supporting
332.31	Single Conductors

332.40	Boxes and Fittings
332.80	Ampacity

 

III. Construction Specifications

332.104

Conductors

Solid copper, nickel, or nickel-coated copper.

332.108	Equipment Grouding
332.112	Insulation

Highly compressed refractory mineral.

332.116

Sheath

Continuous construction that ensures mechanical protection and a moisture seal.