THHN stands for Thermoplastic High Heat-resistant Nylon-coated. THWN wire is the same , but the “W” stands for water-resistant. ... THWN has a maximum temperature of 90°C in dry and wet locations, whereas THHN wire can only be used in temperatures as high as 75°C in wet locations.
What use is Thhn wire suitable for?
It’s designed with a specific insulation material, temperature rating, and condition of use for electrical wire and cable. Extremely popular as an inexpensive building wire, THHN wire serves its purpose admirably and can be used for wiring machine tools, control circuits, and certain appliances .
Can WIRE be both Thhn and THWN?
As previously mentioned, THHN now comes with a dual rating (THHN/THWN or THWN-2) and can be used for both wet and dry applications .
What is the difference between THW and THWN wire?
THWN wire: It Indicates a single conductor having flame-retardant, moisture and heat-resistant thermoplastic insulation with a jacket of extruded nylon or equivalent material. ... THW wire– Indicates a single conductor having flame-retardant, moisture and heat-resistant thermoplastic insulation.
Can Thhn be used in wet locations?
THHN is thermoplastic, highly heat-resistant (up to 90 degrees C.), and nylon-jacketed. It is not suitable for wet locations . THWN is similar to THHN but is rated only for a maximum of 75 degrees C and it is suitable for wet locations.
Does Thhn have to be in conduit?
If it’s only THHN, you can’t put it in an exterior conduit , which is a wet location. But most such cable is multi-graded.
Can you direct bury Thhn wire?
THHN wire can be used in a conduit but is not rated for direct burial alone .
Can you use Thhn wire for service entrance?
Service Entrance Cable: Individual conductors rated XHHW-2 or THHN/THWN; feeds power from a main breaker to a subpanel. Can be exposed to direct sunlight and in wet or dry locations.
What does Thhn stand for on wire?
THHN ( Thermoplastic High Heat-Resistance Nylon coated ) is a cost-effective building wire that is typically used for carrying electrical currents between buildings and external power sources, signaling, control wiring, machine tools, and automation systems.
Is Thhn water-resistant?
THHN wire without a dual approval of THWN is not water-resistant . The water-resistance allowed it to be installed outdoors and in conduit when THHN wire could not. However, remember that they’re all combined into a universal wire now.
What type of wire can I run in conduit?
Wiring Used With Conduit
The most common type of cable used in home wiring is non-metallic (NM), or Romex, cable. While NM cable can be run inside a conduit, this is seldom done. The types of wire most commonly installed inside of conduit are THHN and THWN .
Can you run Thhn underground in conduit?
and NO you cannot use THHN in underground conduit . While most THHN is also dual rated as THWN, not all of it is. You must have that W in there for it to be rated for wet conditions, which underground conduit is.
What is THWN 2 wire used for?
Type THHN/THWN-2 building wire is intended for general-purpose applications as defined by the National Electrical Code (NEC). Type THHN/THWN-2 is permitted for new construction or rewiring for 600-volt applications. THHN wire is normally installed in conduit, and is used in residential and commercial applications.
Is Thhn rated for outdoor use?
THHN is still the single conductor wire used outdoors and in conduit, because the THWN rating can resist water, oil, gases, and solvents.
What temp is Thhn wire good for?
THHN wire is approved for up to 600V and is listed by Underwriters Laboratory (UL), as rated for 90° C (194° F) in dry and 75° C (167° F) in wet environments . THHN wire comes with a dual rating: THHN / THWN, which means it’s appropriate for both dry and wet applications.
What does AWG stand for?
AWG ( American Wire Gauge ) is a U.S. standard set of non-ferrous wire conductor sizes.
