Cut Sheet

Jacketed Metal Clad Cable Termination Fittings
Jacketed Metal Clad Cable and Teck Cable
Metal Clad Cable (Type MC) Ref. NEC Article 334*
“Metal Clad Cable Type MC is a factory assembly of one or more conductors,
each individually insulated and enclosed in a metallic sheath of interlocking
tape, or a smooth or corrugated tube.”
Metal Clad Cable Type MC is rated for use up to 5,000 volts. The National
Electrical Code permits use of metallic sheath as an equipment grounding
conductor.
Metal Clad Cables are available with a variety of phase conductor insulations
such as crosslinked polyethylene, and silicone rubber ethylene propylene,
depending on rated temperature of conductors and working potential.
Metallic sheath can be of galvanized steel, aluminum, copper or bronze.
A special outer covering such as PVC or Neoprene over metallic sheath
is usually provided for environmental protection.
Metal clad cable is not permitted in locations where it could be subject
to physical damage. Metal clad cable can be used exposed, concealed, in
cable tray, in any approved raceway, and with minor exceptions in hazardous
locations. Type MC cable can also be used for services, feeders, branch
circuits, power, lighting, control and signal circuits.
Use of metal clad cable is permitted in wet locations, or where exposed to
destructive corrosive conditions or can be directly buried in earth, concrete
or exposed to cinder fills, strong chlorides, caustic alkalis, vapors, chlorine
or hydrochloric acids provided the construction of cable, the conductors
within the metallic sheath, the metallic sheath and protective cover over
metallic sheath comply with requirements enumerated in Sec. 334-3 of
the National Electrical Code.
Bend radius restrictions are dependent on the size of the cable and the
type of sheath, i.e., smooth, interlocked armor, corrugated sheath or shielded
conductors and varies from 7 times to 15 times cable external diameter.
NEC Article 334 requires that approved fittings be used for termination.
Where single-conductor cables carrying alternating current enter a ferrous
metal box or enclosure, procedures described in NEC Section 300-20 must
be followed to reduce effects of heating due to induced currents. These
procedures include recommended arrangements of conductors, cutting of
slots in metal between individual conductor holes, passing of conductors
through insulating walls, or use of non-magnetic aluminum sheathed cable
and aluminum terminating fittings.
Portions of this section reprinted by permission from NFPA 70, National
Electrical Code
®
, National Fire Protection Association, Boston, MA.
Please refer to the following for further details and complete information:
1. NEC Article 334…Metal Clad Cable (Type MC)
2. UL 4, ANSI C33.9…Safety Standards for Type MC Metal Clad Cable
3. UL 514B, Safety Standards for Outlet Boxes & Fittings
4. A-A50552…Federal Specification. Fittings for Cable, Power Electrical
& Conduit Metal, Flexible
5. NEMA FM-1…Standards Publication. Fittings and Supports for Conduit
and Cable Assemblies
Teck Cables
Teck cable derived its name from one of its first users, the Teck-Hughes
Gold Mines in Kirkland Lake, Ontario. Teck 90 is CSA Type designation.
Trade designation of this cable is Armored Cable.
Teck cables up to 5,000 volt working potential are manufactured in accordance
with CSA Standard C22.2 No. 131 and are provided with a bare ground
conductor and an optional outer jacket. Depending on phase conductor insulation
the cables are designated as Teck 90 (X-LINK) when insulation is cross-
linked polyethylene and Teck 90 (EP) when insulation is ethylene propylene.
Both cables are rated for 90° C service (dry location) and 75° C (wet
locations). When Teck cable is suitable for installation down to minus 40° F
the cables are marked Teck 90 (X-LINK) minus 40 or Teck 90 (EP) minus 40.
Over 5,000 volts working potential Teck cables are manufactured in accordance
with IPCEA standards and are certified by CSA. Cables are provided with or
without ground wire as required.
Teck cables with outer jacket may be used for exposed or concealed wiring in
wet or dry locations, indoors/outdoors and in corrosive environments. Teck cables
are suitable for use in ventilated, non-ventilated and ladder-type cable troughs,
in ventilated flexible cable ways in both dry and wet locations. Teck cable with
outer jacket is suitable for direct earth burial and for Class II Division 2, Class
III Division 1 & 2 hazardous locations per Canadian Electric Code.
Some of the features of Teck cable are its flexibility and ease of installation.
Absence of dead air space within cable increases heat transfer and minimize
condensation. Overall protective covering provides good environmental protection.
Bend radii for permanent training during installation usually varies between
7 times to 12 times the cable diameter depending on cable construction
and manufacturer’s recommendations. Larger radii bends are required for
other conditions.
Section 12-3028 of the Canadian Electric Code requires that the terminating
fittings used must provide adequate strain relief to terminal connections
and ensure electrical continuity without injury to non-metallic sheath.
Continuity is mandatory whether or not the armor is used as a grounding
conductor. Except for dry locations free from corrosive atmosphere, the
non-metallic jacket is not permitted to be stripped back to a point where
armor is exposed after installation.
Where single conductor cables carrying 200 amps or more enter metal
boxes through separate openings, certain precautions are required to prevent
overheating of the metal by induction. Use of non-ferrous or non-metallic box
connectors, locknuts and bushings and installation of non-magnetic panel
inserts is suggested in the code.
Please refer to the following for further details and complete information:
1. CEC Section 12…Wiring Methods
CEC Section 4…Conductors
2. CSA C22.2 No. 131 & 131S
(Supplement #1)…Safety Standard for Type Teck Cable
3. CSA C22.2 No. 18…Safety Standards for Outlet Boxes, Conduit Boxes
and Fittings
4. UL File E82038 — Volume 1, Section 3, Page 1, Revision 1/31/2007
Please Note: The materials herein, whether relating to the National Electrical Code, the Underwriters Laboratories, Inc. listing, to industry practice or otherwise, are not intended
to provide all relevant information required for use and installation of our products. Refer to applicable codes, instructions and industry specifications prior to installation or use.
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