hope someone can educate me on a few things. i would like to add an outlet to the far end of my pergola. i already have electrical on the pergola. i plan on using 3 single 12g wires. in emt conduit with exterior gang box. when i go to lowes i see the southwire rolls of wire. the label has thhn,thwn and one more item(i forgot what it was) my question is. since the label has thhn and thwn, does that mean it is rated for outdoors? or will thhn be good enough since its in conduit. thanks in advance for any help.