THHN THWN THWN-2 Umugozi urakwiriye gukoreshwa nkigikoresho cyimashini, kugenzura imiyoboro, cyangwa insinga zikoreshwa.THNN na THWN zombi zifite PVC iziritse hamwe namakoti ya nylon.Ubushuhe bwa termoplastique PVC butuma insinga ya THHN na THWN ifite flame-retardant, mugihe jacket ya nylon nayo yongerera imbaraga imiti nka lisansi namavuta.