How many sets of C7/C9 Light Strings can be connected together?
It is recommended that when using 5 watt bulbs, only 175 bulbs are allowed per circuit. For 7 watt bulbs, only 125 bulbs are allowed per circuit. A circuit is when one or more light strings are connected together end-to-end. Running more bulbs the recommendations above may cause the wires to overheat and lead to a fire hazard.