Originally Posted by LFugate
I have a 200 AMP fuse box for the house. How do I know if I can add another 30 AMP breaker? I thought I could add up the breakers already installed, but there is now way that is correct. If it is, I'm way over the limit now
. Any electricians (or knowledgeable person) that can tell me how to figure this out?
I'm not an electrician but I'll take a stab at giving you a simple answer.
Think of it this way, in terms of water lines. Your house has a constant supply of 200 incoming gallons of water (amps). You have X number of separate water lines in your house (electrical circuits) , each of which has numerous faucets on the line (appliances, lights, stove, etc). Each line can pass Y number of gallons to it's faucets, but no more. (number of amps listed on breaker).
Now, If you open too many faucets on a given line (exceed the capacity of the line by plugging in and turning on too many things), the automatic safety switch (circuit breaker) for that line opens and turns off the water . But say you only open 2/3 of the faucets on each of the lines and so no safety switches are enabled. However, if the total water draw from the combined lines exceeds 200 gallons, the safety switch for the main incoming line operates and the water flow to your house is cut off.
It is actually much more complicated than the simple way I have tried to explain it, so don't think you have the whole picture, 'cause you don't. However, let me try to answer your question to some degree.
You must, firstly, remember that all of the faucets on all of the water lines in your house are not open at the same time and, because of that, it would be unusual to run out of water.
So, yes, another circuit can be installed for your camper. As long as your trailer consumes less than 30 amps at a given time, and as long as the total number of amps being consumed by everything connected to your breaker box does not exceed 200 amps.
Hope this helps some and don't try do DIY.