MTW Electrical Wire
MTW wire stands for "Machine Tool Wire" and we have the THHN and THWN rating on all of our THHN electrical wire. If our wire was simply THHN rated then it would not be water resistant, however all of our single conductor THHN electrical wire is Tri-rated for THHN, THWN and MTW. It's a stranded or solid bare copper wire with a PVC insulation over it.
- We also stock a more flexible MTW Wire that comes in bare copper or tinned copper which does NOT have the THHN and THWN rating on it. It has a UL 1015 rating instead that approves it for 105°C instead of 90°C.
MTW Wire
MTW Wire Information
South Wire is one of the manufacturers of our electrical wire and they no longer make the single rated wire for MTW wire, THHN or THWN. It's much easier to just manufacture the Tri-rated material and sell it at the same price.
We have a tinned copper version of the MTW wire which is much more flexible because it's made with smaller awg copper strands. This version of MTW is also made with a PVC insulation not including a nylon coating.
We even sell a lot of tinned copper wire with or without insulation. MTW wire comes in bare copper or tinned copper because each type of wire has it's advantages. The bare copper is used in the electrical field as a power supply and the tinned copper has a similar job to supply power but the tin is used to make soldering easier. The tin will melt slightly and adhere to the solder much better.
Since there are very slight differences between THHN wire, THWN wire and MTW wire they are easily manufactured into one wire with all ratings. If you have any electrical wire questions please feel free to call or email to ask them.