How many lines can be on one 30amp 240breaker?

Hello. My name is Richie. I am an electrician and a home improvement expert. I will help you the best I can.

First thing I, you and we need to know is what is the amperage (wattage) of the heaters. Next, is the existing panel full or do you need to put a sub panel in a totally different location from the existing one? If you have a heater, I know you may install more so lets look at one, if the heater is 2880 watts at 240 volts, the amperage is 12 amps. This is where Ohms Law comes into play.

E = Voltage

I = Amps

P = Watts

P = I X E

If you know the amps. . . . .

Example: 120 volts X 12 amps = 1440 watts

Example: 240 volts X 12 amps = 2880 watts

Or you turn it around depending on the information you have.

If you know the watts. . . . .

Example: 3000 watts / 120 volts = 25 amps

Example: 7500 watts / 240 volts = 31.25 amps

You can use the calculator on the site below.

Remember too that you shall not put more than one appliance on a breaker. Also, any amperage shall not be on a breaker that exceeds over 80% of the calculated load. If you have a 15 amps breaker, you should not use more that 1440 watts or 12 amps of power. If you have a 20 amp breaker, the load should not exceed 1920 watts or 16 amps.

If you power is 5500 watts at 240 volts, the breaker should be a 30 amp breaker. The calculated amperage is 22.91. The next allowable breaker size is 30 amps.

The total amperage that you can use on your two pole 30 amp breaker is 24 amps. So if you have two heaters, each should not exceed 12 amps/2880 watts each.

If you have any other questions, feel free to contact me at rsrasmussen72@yahoo.com or rrasmussen@gofifthstreet.com.

Good luck and God Bless. Jesus Christ loves you.

I presume the two electric showers are the type that heat the water themselves and not just pumped showers that pump the water from your hot water cylinder.

So first of all if they are the showers that heat the water, they can be between 8 KW and 11 KW.

It is recommended you have only one of these in your house, if you have two they should be wired in such a way through a contactor at fuse boardd, so you can only use only one at a time.

Showers should be wired on seperate circuits, using 10sq twin and earth cable, protected by a 40 Amp RCCBO Tripswitch (Earth Leakage protection breaker) at fuseboard Do not have anything else on these breakers.

I presume your dryer is plugged into an ordinary socket power point! I would recomend to run a seperate 2.5sq twin and earth cable to this socket and fuse it with 20 amp trip switch (MCB) at fuseboard.

You should also run a few seperate lines to other socket circuits in Kitchen where most power will be used.

It is not the Voltage you need to be worried about, it is the current (AMPS) that appliances take, this is what causes overloading.

You could wire the rest of sockets in house on a few Ring Circuits, i.e..feed the circuits from two directions with 2.5 twin and earth and fuse them with 32 amp trip switch with an RCD protecting them also at fuse board.

Hope this helps,

30 amps is standard for an electric dryer, and it's usually on its own circuit. I'm not a professional, but as far as I know, the only thing that must be on its own circuit is solar feed-in. Everything else, you can put as much as you want on the circuit, but will be subject to nuisance trips. Picture this, you're in the shower, shampooed up, or maybe shaving, and the hot water suddenly cuts out. Do you really want to get out of the shower to go turn off the dryer, or to tell the person in the other shower to turn off their hot water, and also walk to the service panel to reset the breaker?