additional protection is provided
I. General
332.1 Scope. This article covers the use, installation, and construction specifications for mineral-insulated, metal-sheathed cable, Type MI.
332.2 Definition.
Mineral-Insulated, Metal-Sheathed Cable, Type MI. A
factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation and enclosed in.a liquidtight and gastight continuous copper or alloy steel sheath.
II. Installation
332.10 Uses Permitted. Type MI cable shall be permitted as follows:
(1) For services, feeders, and branch circuits
(2) For power, lighting, control, and signal circuits
(3) In dry, wet, or continuously moist locations
(4) Indoors or outdoors
(5) Where exposed or concealed
(6) Where embedded in plaster, concrete, fill, or other masonry, whether above or below grade
(7) In any hazardous (classified) location
(8) Where exposed to oil and gasoline
(9) Where exposed to corrosive conditions not deteriorating to its sheath
(10) In underground runs where suitably protected against physical damage and corrosive conditions
(11) In or attached to cable tray
FPN: The "Uses Permitted" is not an all-inclusive list.
332.12 Uses Not Permitted. Type MI cable shall not be used under the following conditions or in the following locations:
(1) In underground runs unless protected from physical damage, where necessary
(2) Where exposed to conditions that are destructive and corrosive to the metallic sheath, unless
332.17 Through or Parallel to Framing Members. Type MI cable shall be protected in accordance with 300.4 where installed through or parallel to framing members.
332.24 Bending Radius. Bends in Type MI cable shall be so made that the cable will not be damaged. The radius of the inner edge of any bend shall not be less than required as follows:
(1) Five times the external diameter of the metallic sheath for cable not more than 19 mm (•% in.) in external diameter
(2) Ten times the external diameter of the metallic sheath for cable greater than 19 mm (VA in.) but not more than 25 mm (1 in.) in external diameter
332.30 Securing and Supporting. Type MI cable shall be supported and secured by staples, straps, hangers, or similar
fittings, designed and installed so as not to damage the cable, at intervals not exceeding 1.8 m (6 ft).
(A) Horizontal Runs Through Holes and Notches. In other than vertical runs, cables installed in accordance
with 300.4 shall be considered supported and secured
where such support does not exceed 1.8 m (6 ft)
intervals.
(B) Unsupported Cable. Type MI cable shall be permitted to be unsupported where the cable is fished between access points through concealed spaces in finished buildings or structures and supporting is impracticable.
(C) Cable Trays. All MI cable installed in cable trays shall comply with 392.8(B).
332.31 Single Conductors. Where single-conductor cables
are used, all phase conductors and, where used, the neutral
conductor shall be grouped together to minimize induced
voltage on the sheath.
332.40 Boxes and Fittings.
(A) Fittings. Fittings used for connecting Type MI cable to boxes, cabinets, or other equipment shall be identified for such use.
Terminal Seals. Where Type MI cable terminates, an
end seal fitting