Applies to the installation of electrical wiring within buildings. Contemplates electrical wiring for the installation of commercial sewing machines or satellite dish installations. Applies to occasional, limited or minor amount of work performed on an electrical apparatus when the work is conducted on an accommodation basis by a contractor whose principal work at the job site is electrical wiring. Refer to code 9519 for the cleaning, oiling or adjusting or a refrigeration system and the installation and repair of commercial appliances and codes 7611, 7612 and 7613 for telephone or cable line installers.