Electrical projects require installing electrical wire, but which types of wires can be used in dry locations? The better question is, what does the 2008 National Electrical Code say about it? The National Electrical Code defines the locations in which certain electrical wire types can be used.
Article 310.8 discusses both wet and dry location insulated conductor and cable installation types. It is good for you to be aware that not all electrical conductors and cables are the same. The insulation type determines the areas they can and cannot be used. It speaks of types MTW, RHW, RHW-2, TW, THW, THW-2, THHw, THWN, THWN-2, XHHW, XHHW-2, and ZW as being types of insulated conductors and cables that are allowable in wet locations. So before you install electrical conductors and cables in your next electrical project, be sure to check the latest National Electrical Code for its recommendation on specific types.