While the NFPA allows the use of MTW or THHN wire inside control panels, MTW is often preferred for its flexibility and easier handling. Type TFFN (stranded) wire is primarily used as fixture wire as specified by the National Electrical Code (NEC). Type THHN wire is intended for general purpose applications.
THHN General Purpose Building Wire - 4, 6, 8, 10, 12, 14 AWG
In 500 ft. and 2,500 ft. spool and reel lengths
Electrical Wire Available from AutomationDirect
Insulation Type - MTW
Type MTW conductors are primarily used
in control cabinets, in machine tool applications
and appliance wiring applications
at temperatures -25°C to 105°C. MTW wire
complies with the National Electrical Code
(NEC) and NFPA Standard 79. Voltage
rating for all applications is 600 volts.
Now available spiral striped MTW wire (NFPA Standard 79).
New ... 20 AWG wire added
Type MTW wire starts at $25.00 (500 ft.)
Type MTW Wire Overview
Insulation Type - TFFN
Type TFFN (stranded) conductors
are primarily used as fixture
wire as specified by the
National Electrical Code (NEC),
at temperatures not to exceed
90°C in dry locations. Voltage
rating is 600 volts.
Type TFFN wire starts at $33.00 (500 ft.)
Type TFFN Wire Overview
Insulation Type - THHN
Type THHN building wire is intended for
general purpose applications. It is
appropriate for new construction or
rewiring for 600 volt applications. When
used as type THHN, the conductor is suitable
for use in wet or dry locations at
temperatures not to exceed 90°C or not to
exceed 75°C in oil or coolants.
Type THHN wire starts at $62.00 (500 ft.)
Type THHN Wire Overview