goto your local hydroponic store and ask them for a "green air cyclestat"
this little beauty is exactly what your looking for, its grounded, and if memory serves me correctly, rated for 15 amps 110V
it allows you 5 seconds to 30 min of "on" time and 7 minutes to 8 hrs "off" time between cycles
itll run ya about $100 cad.. hope this helps
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