![]() 400 amp main breaker panel has wire bending space for 600 kcmil cables. One thing I think is nonsense is they claim some outlets are reverse polarity, can there even be reverse polarity on a 2 conductor wiring system? I assume they plugged something in to the individual outlets, but if you plug something in (two prong in to 2 prong), it works either way so is there a possibility to hook the wires up backwards and have it come out reverse somehow? I imagine it would be a simple fix if it is reversed, just swap wires. Note: Main breakers use breaker connectors. Potential buyer had an inspection done (it is an estate sale so there are a lot of exceptions made as far as what needs to be disclaimed, etc is what I was told, can be sold as-is).īut a lot of the inspection is really nonsense. The primary side has a 100 amp breaker with 3's ran to the primary side of the transformer. I ran 3/0 to a 200 amp main on the secondary side. The secondary load calc came out to be 157 amps. So we are selling the house and of course the old homestead is all 2 conductor. I have a 480 volt primary delta and a 120/208v wye 75 kva transformer. My mom passed on last year at 94, she had been in the family home for 70+ years, and had a great life (was driving til she was 93!). Table 310.16 says 1 AWG THHN can handle 150 amps. All of our high-draw equipment is on the opposite side of the house from the main panel, so we'll be running very little directly from the main panel. You can feed a subpanel with any amount of current up to it's maximum rating, which is 200A in your case. It doesn't matter whether it's there or not. FWIW, you don't need a main breaker in the subpanel. Well this story could stretch for paragraphs and paragraphs, here is the question with a brief explanation. We're wiring a new house - 200 amp main panel and 150 amp subpanel. HackWork 2 (Edited) No, no problem at all. Add the amperages of all the individual breakers in the box. All that is left to do now, is connect it all together to complete the curcuit.Hi all. Most breaker boxes are 100, 150, or 200 amps. Wires tend to heat up when the amprage is raised. It would be sensible to add a note near the main panel that the cable is only rated for 50A, so not to change the breaker (so you, or a future purchaser, remembers in a year's time). ![]() Once all this has been established, you can now bring your sub panel in, you must then calculate the amount of constant amprage that will run through this box, it is best if the constant amprage falls short of the total amprage by at least 20 amps. The cable to your hot tub will be rated for 50A (not 100A) therefore you must not upgrade the breaker in your main panel to 100A. If the wire will be air bound you must make sure it will be out reach, to anything. Once this has been decided, depending on distance, you must figure where you will put this wire, are you putting it in the ground, if so you will have to protect it with conduit, and depending on how much and how heavy the the traffic that will cross the wires will be, if cars and trucks are to cross this area, it would be wise to get the proper conduit, or risk having to dig it all up because of broken wires. Of course you can, you can add the 100 amp breaker to your 200 amp as long as it isn't overloaded, to start adding the subpanel you must first calculate how many yards it will be from the main panel to the subpanel, there is a formula that calculates how much friction will be on the wire at the connecting distance, then you can look at a wire chart and choose the wire size that will best handle the resistance.
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