Electricians (including pro and helper) in the Phoenix MSA (Phoenix-Mesa-Scottsdale), Arizona drew combined total wages of $511 million in 2018.

A ballast is commonly used in fluorescent lighting to regulate the current of a lamp and the voltage to start one. The use of electronic light ballasts initially rose in usage during the early to mid 1990s.

Within the electrical system of a commercial building, one of the essential features of the is the emergency lighting.