Posted by John T on January 30, 2009 at 13:39:44 from (98.115.40.108):
In Reply to: Generator Hook Up O/T posted by kmcampbe on January 30, 2009 at 11:26:44:
Myself and other engineers and electricians beat this to death on this a while back on another board I may try n find you the link later, no sense in re inventing the wheel all over again lol
To do it right and safe, you need EITHER a lock out assembly on your existing panel (it insures main is tripped before the panel can be back fed via a generator) OR else use a transfer switch......
If you use a two pole transfer switch or backfeed a 2 pole breaker and dont do any Neutral switching,,,,,,you must remove the generators Neutral to case/frame bond and then run 4 wires (2 hots L1 and L2,,,,,Neutral,,,,,,,Equipment Ground Conductor) from the genny to the transfer or panel.
NOTE if the genny itself is used to feed plug n cord connected equipment right from its own receptacles, in that case the gennys case/frame to Neutral bond remains intact and no grounding electrodes are required i.e. you dont have to drive a ground rod and connect it to the genny.
NOWWWWWWWW before anyone jumps my bones sureeeeeeee I know (I used to design secondary electrical distribution systems for a living) if you use as 2 pole 3 wire grounding type of say a welding receptacle (has 2 hots and equipment ground, not any seperate Neutral) to backfeed a 240 volt 2 pole circuit so BOTH legs L1 and L2 in yoru panel are energized sureeeeeeeee it works BUTTTTTTTTTTT Im ONLY saying its unsafe and violates all sorts of NEC safety rules and regulations. Its your house so do as yall please fer all I care butttttt the life you save by doing it right may be you or your familys or an electrical lineman......
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