How to Install an Old Work (Retrofit) Electrical Box
Electrical boxes used to mount outlets, switches, and light fixtures in walls and ceilings come in a seemingly endless variety of sizes and styles, including metallic (steel) versions requiring grounding of the box and nonmetallic versions (PVC, phenolic resin or fiberglass) which do not require grounding of the box. Metallic boxes can be used with either nonmetallic (Type NM-B) or metallic sheathed electrical cable. Nonmetallic plastic boxes are designed for use only with nonmetallic sheathed electrical cable.
Original Article Source Credits:The Spruce , https://www.thespruce.com/
Article Written By: Bob Formisano
Original Article Posted on : 11/11/19
Link to Original Article: https://www.thespruce.com/install-old-work-electrical-box-1824655