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Q: What are Neutral Tandem landlines?
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Any problems with shared neutral for for 4 15 amp breakers each on dedicated circuits?

Yes. If it a residential home then you can only have two breakers per neutral and they need to be on opposite legs of your panel. If it is a commercial 3phase panel then you can only put 3 breakers on a shared neutral. Here's why. In your panel assuming its residential you have two power wires and one neutral and these power wires are called legs. If you attach two breakers on the same leg that is across from each other on opposite sides of the panel or skipping a space between breakers on the same side at 15A apiece you return on the neutral will not be balanced and you will have the possibility of 30A coming back to your panel on the neutral which will fry a 14 Awg or even 12 Awg for that matter and cause a fire. Now if the breakers are in tandem that is they have the breaker tie that connects two breakers together they will be on separate legs and then only will your breakers/circuits be balanced and it will be safe to share a neutral on. If two tandem breakers are connected to a single neutral and they are all 15A breakers your return would be 30A again because although your tandem breakers are balanced now you have two tandem breakers returning a potential 15A per two breakers and that adds up to 30A. The next problem you have is when you share a neutral as per the National Electric Code if one breaker trips the other breaker also sharing that neutral must trip so that when the power is off any current that could possibly return through the neutral wire will be cut off. So now this creates another problem with 4 breakers sharing the same neutral is now there is no way to get all four to trip at the same time if there was a ground fault (a short) or an overload. and someone could get nailed by any current coming back on the shared neutral. All the same applies for 3phase except there are 3 power wires and you can use 3 breakers with a 3 breaker tie instead of just two. You either need to run one neutral per tandem breaker or four neutrals for four circuits/breakers. Tandem breakers controlling two separate circuits are a pain because when one breaker trips they trip the other circuit also. Tandems are mostly used for two circuits going to the same appliance so that no power on either leg reaches the appliance when it needs to be off.


Does GE make a tandem two pole 30 - 30 amp breaker?

No, there is a tandem single pole 3030 but GE does not make a tandem two pole 3030.


What is a tandem plug?

An electrical connector once used in the United States that (in theory) was intended for ungrounded 250V applications. However, most tandem plugs used ended up being connected to 125V, as very little 250V (light-duty) equipment was ever made for the American market. Its blades are aligned in tandem (- -) as opposed to standard parallel plugs (| |). In the 1950s, the NEC was modified to officially classify tandem plugs (NEMA 2-15p) for use on 250V connections. The plug (sans a ground pin) was "banned" in the 1960s because it utilized two "hot" wires and no ground or neutral, thus being deemed "unsafe." Sometimes you will find "t-slot" receptacles in older homes; these were intended to accommodate both parallel and tandem plugs.


Does a 15 amp tandem breaker equal 30 amps total?

No, each segment of a tandem breaker is what the breaker rating on the handle states. Tandem breakers are used when there is no space left in the distribution panelboard. You get an extra circuit by removing the full size breaker and installing a tandem breaker,


Why do chemists never use their landlines during the day?

I think you are mistaken, a chemist (that is a chemists shop or pharmacy) will use its landlines (telephone) during the day to speak to customers.