Honeywell, Intermatic and Home Depot are examples of manufacturers and retailers that offer online instructions for installing and setting light switch timers. Different light switch timers may have different setup instructions. Customers follow the particular instructions accompanying the specific brand purchased.
Installing or changing light switch timers may involve working with electric wires, so do-it-yourself customers should turn off the fuse box or circuit breaker and carefully follow accompanying instructions. Because of the risk of electric shock, customers may want to contact a qualified professional for installation. Honeywell is an example of a manufacturer that offers professional installers to customers.