Local Codes

      

Exterior wiring is different than interior wiring because water and extreme dampness are involved. Outdoor wiring projects are not difficult for a do-it-yourselfer, but, for safety reasons, outdoor wiring codes must be followed. Outdoor wiring projects fall into two general categories: functional and decorative. Functional lighting illuminates high-use areas such as steps, stairs, gates, walkways, and outdoor grills. Decorative lighting adds dimension and mood to an exterior space such as highlighting trees and shrubs with light. Functional lighting can also be decorative.

LOCAL CODES:
First, contact the municipal building inspector to determine the requirements for outdoor wiring-if the home center or building material outlet where you do business doesn't know. Sometimes these retailers service many different communities with many code variations, and, therefore, may not know specific codes in your specific neighborhood. In some areas, only a professional electrician can make the final electrical hookup. In other areas, the work must be inspected before it can be put into operation.

Find out if local code permits the use of Type UF cable, or if it specifies Type TW wire and conduit. Generally, local codes require that outdoor wiring be protected by conduit in an instance in which outdoor wiring is installed above ground. If wiring will be buried, most cables allow Type UF cable. However, some require that Type TW wire and conduit be used.

The National Electrical Codes (NEC) now requires No. 12 gauge wire for all residential electrical wire.

GROUND FAULT CIRCUIT INTERRUPTERS:
Ground fault interrupters (GFCI) are now required by the NEC in all outdoor areas. Complete information on GFCI outlets can be found here.

MATERIALS FOR OUTDOOR WIRING:
Outdoor electrical equipment, such as fixture boxes, switches and outlets is especially manufactured to meet codes and resist the elements. You also should use weather proof light bulbs in outdoor fixtures. These resist shattering when the temperature drops.

CAUTION:
Do not use electrical products specified for indoor use outdoors.

Next