Hi Nick length of wire does make a big difference due to I2R losses in conductors. It also makes a big difference in your insurance should you burn something down or electrocute someone by using improper conductor size or not using GFI outlets as specified by the National Electric Code and your local codes. There are specific sections concering wiring around ponds swimming pools and greenhouses due to the constant moisture. Here in Alabama you don't have to be licensed to do wiring on your own property if you own it but other states differ in their regulations. It is always safer to look into everything prior to doing it. Remember electricity and water don't mix.
Bob
