I really wish this wire had the individual wires marked in some way to make it easier to wire a polarized plug lamp. I have to mark them myself and I'd rather not have to do that.
Answer from Fabricwire.com:
Dear JC, thank you for your comment and review. We would like to provide you more information on our flat wire (SPT-1) wire: SPT wire is polarized and generally comes with two different wire textures on the wire pair to help identify the polarity when you hook it up. One wire is smooth, it is generally used for the Hot or Line wire. The other wire is usually ribbed, it is generally used for the neutral wire.
Hope this information will be helpful for your future wire installation project.
2nd Sep 2013
GREAT PRODUCT AND SERVICE
Just as advertised. Thank you.C. Doner
1st Apr 2013