I have a 240v 50amp service circuit and I would like to split it into 2x 120v circuits, something like the image below.
How would I do that, junction box of some sort? And specifically, how would I "split into 2" the ground and the neutral? Just throw some Marrettes on them and pigtail it or use some sort of bus bar or junction box?
Please provide specifics on the parts if you can (i.e.: this type of junction box, etc.)
I'll keep the gauge wire the same (6 AWG in the 240v I think) for the 240v and 120v, as they will both be rated for 50amps.
This is for my RV. It has 240v 50amp service. I am installing 2 inverter, charger, solar controllers, both rated for 120v, 3000 watts each. Each has a 120v input (ground, neutral, line) and a 120v output (neutral and line, grounded to chassis), not including the PV in and battery in. So essentially, I need to split that 240v input that goes into my breaker panel, into 2x 120v (one for each inverter) and then the 120v output of each inverter will go to each side of the panel. The panel has a dual pole 50amp breaker.
Considering the 3000 watts of the inverters, I'll probably switch that 50amp to a 30 amp breaker. The inverters will peak at +10% for 20 seconds and cut out if needed, but a breaker will add extra protection.
This is so that when I am connected to "shore power" I can use the utility power, the inverters will balance the load between solar, battery and utility as needed.
Here is an image of the breaker panel:
and here is an image of the 120v inputs and outputs on the inverter (there will be 2 of these) – also, not my wiring, this is a stock footage off the internet of my model of inverter. I haven't hooked mine up yet.
We might be getting closer to the answer, maybe it was pretty simple. I think maybe a power distribution block is what I was looking for?
How about just 2 of these?
Best Answer
Basically for what you ask just wire connectors rated for #6 in a junction box is good.
Thinkin #6 is too big for marrettes, you probably need polaris or NSI inslated connector like this IPL4-3C.
In jurisdictions regulated by adoption of the NEC you need a box 5 in³ per conductor, your grounds will count as one, so a 50 in³ box.
The big concern is if you're feeding devices that draw less than +/-40A that 50A breaker might not trip before a fire is started, so more details are needed to determine if what you propose is safe.