![]() ![]() ![]() So the building is supplied using two hot legs (L1,L2) which are 180 'out of phase', and the center tap (N). This is because in US residential wiring, the house is fed from a transformer with a center tapped secondary. About 19:45 it gets to a demonstration of how a small generator can backfeed to produce dangerously high voltage on power lines.īottom line: This is often (not always) a job for an electrician, and in any case needs to be done carefully, thoughtfully and safely. Each hot wire will have an electric potential of 120V to neutral/ground, and 240V potential to each other. It is (as you'll see) primarily targeted to fire & rescue personnel but really includes a lot of useful information and warnings for everyone. Speaking of backfeeding - I just discovered this fantastic video showing many of the dangers involved with electrical work. Plus a transfer switch (which can take many forms - a purpose-built transfer switch, interlock + subpanel, etc.) prevents you from backfeeeding your generator power into the utility lines and zapping (potentially fatally) the people who are trying to restore the utility power. This effectively makes it so you don't have live dangerous prongs from a cord sticking out of your cable (either end, depending on the situation). Outlet and Transfer: While it may seem like it shouldn't matter - if the power is out then what's wrong with adding power to your house from a generator - the proper way to get power from a generator to your house (short of a permanent hardwired installation) is with an inlet. If you managed to get your 4-prong generator connected to a typical 3-prong home receptacle, you would end up with a lot of problems + things most likely not working. new 4-prong), typically that is the difference between 120V (hot/neutral/ground) and 240V (hot/hot/neutral/ground). 4-prong: While there are some exceptions (the issue of old 3-prong dryer receptacles vs. There are a whole bunch of important safety issues here.īut the two key items - that must be followed:ģ-prong vs. ![]()
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