A: Hi Jeffrey,
These strings come with just one male plug so they cannot be connected end to end.
If you are planning to run the 50-foot cords in series, you might consider purchasing the 100-foot cord.
This cord made with 18 AWG wire which is rated at 10 amps. The maximum light line length for 18 AWG wire is 250 feet - so even if you are using LED bulbs, you are limited to series runs of no more than 250 feet.
Beyond these recommendations we suggest that you work with a master electrician if you want to modify the cords.
Hope that helps.
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Answer provided by: Shellie Gardner (11/13/2013)