What does THWN-2 mean?
Table of Contents
What does THWN-2 mean?
HOW TO KNOW THE DIFFERENCE
| THHN/THWN-2: | XHHW-2: |
|---|---|
| T = Thermoplastic | X = Cross-Linked Polyethylene (XLPE) |
| HH = High Heat Resistant | HH = High Heat Resistant |
| W = Water Resistant | W = Water Resistant |
| N = Nylon Jacket | (Not Required) |
Can THWN-2 be buried in conduit?
The short answer is no. THHN and THWN-2 Copper Building Wire is only approved to be buried in conduct, as it lacks the characteristics that would make it eligible for direct burial.
What is the difference between THWN and THWN-2?
The main difference between these two standards is their maximum temperature in wet locations. 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.
Can I use THWN in underground conduit?
THHN wire can be used in a conduit but is not rated for direct burial alone.
Is Thhn the same as THWN 2?
Thermoplastic high-heat resistant nylon-coated wire, or THHN, is a common wire used for connecting branch circuits and appliances. Its counterpart is called THWN (or THWN-2).
What is #2 Thhn rated for?
Allowable Ampacities of Insulated Copper Conductors
| Conductor Size (AWG/KCMIL) | 60°C (140°F) TW, UF | 90°C (194°F) TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, XHH, XHHW, XHHW-2, USE-2, ZW, PV |
|---|---|---|
| 3 | 85 | 115 |
| 2 | 95 | 130 |
| 1 | 110 | 145 |
| 1/0 | 125 | 170 |
How long will THWN wire last underground?
Typical underground installations are expected to last up to 30 years. Nylon, the main covering of THHN, is very susceptible to water and moisture, causing additional breakdowns in the wiring under adverse conditions.
Is THWN wire waterproof?
THHN wire is the most common type of single conductor electrical wire. It’s manufactured with a dual rating of THHN and THWN so that it’s all water-resistant. It can be used indoors and in conduit only.
What does THWN stand for?
THWN stands for Thermoplastic Heat and Water-resistant Nylon-coated. THHN stands for “Thermoplastic High Heat-resistant Nylon-coated”. THWN-THHN-2 wire is one of the most common single conductor wires used in the United States.
What is THWN wire used for?
What is THHN Wire? Thermoplastic High Heat-resistant Nylon-coated wire (THHN) is a single conductor wire with PVC insulation and a nylon jacket. It’s commonly used in conduit as electrical wire for buildings. Its heat and oil resistance makes THHN a suitable wire for appliances and machine tools.
Can Romex be ran underground?
While THHN and THWN wires can be used in outdoor settings, they cannot be put directly underground. Romex features a bare copper ground wire inside the cable that is not fully protected by the polyvinyl chloride (PVC) jacket which covers the conductors.
What is THWN copper wire?
What is THWN Cable. THWN is a code for thermoplastic heat and water resistant which is suitable for use in both dry and wet locations with a maximum temperature rating of 75ºC (167ºF).
