I recently have dealt with a contractor who has rolls of wires that are mislabeled. The rolls are labels #14 THHN stranded. The actual labeling on the insulation says #16 type TFFN or MTW. I am not going to allow the wire to be used, but the insualtion sure looks like THHN. the insulation appears to be a bit thicker than #14 THHN but I'm not sure if this is just a variance that may occur in the manufacturing process. I easily spotted some THHN #16 this contractor accidently( I hope) used before, but this # 16 was hard to tell without reading the labeling on the insulation.
I have told the contractor to have his guys read the insulation not the roll but the accident happens anyways.
Has anyone seen this occurence of mislabeling?
Is there an easy way to determine all the different insulation types? some are fairly similar looking.
I am going to notify the manufacturer of this occurence and see if they have knowledge of a bad batch of labeled wire or if this could be an isolated incident.
And just in case anyone was asking themselves if the contractor might be trying to pull a fast one, I saw what appeared to be full rolls from the manufacturer, but you just never know.