Electrical Questions? Ask an Electrician Online.
Hi, I'm Mike G and I'll be glad to assist you. What is it you don't understand?
OK, you have a 3 wire cable. What is it you are to control, what is the voltage? This timer will work on several voltages with a setting made.
Ok, wire as follows
T1- white wire
T2- black wire with jumper to T3
T4- red wire
That's the way I like it.