SeattlePot
Well-Known Member
So I would like to set up a new grow in an outbuilding. Unfortunately, its not really going to be possible to run new wire to the site, the neighbors would likely find it suspicious. Currently there is an underground 12/2, 20 amp line going to the site. Is there any reason why I could retro-fit it to carry 240v to a sub-panel at the site? I'm not an electrician so please bear with me. Id like to run 2 1200 watt ballasts (4 600 watt) along with some fans and pumps. The total setup should stay under 40 amps. Would it be safe to rewire the line? Current code requires that a 240v wire have both a ground and a neutral but is this absolutely necessary, I know it was done with only three wires for many years? I intend to run it off of a main panel with a 40 amp breaker and have 4 15 amp breakers at the sub-panel. Assuming that all of the electrical junctions and wiring is done properly, I just want to know if my plan to use the current 12/2 is (relatively) safe?
I've included a little diagram of my plans, sorry I'm no schematician (probably not a word).
I've included a little diagram of my plans, sorry I'm no schematician (probably not a word).
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