I have 2-240V (4.2V) basebaord heaters, Need Wiring Diagram
Hello, Buddy of mine ran 10/3 Wire for 2-240V baseboard heaters & Has a 120/240V 2-Pole 20AMP Breaker. Question for you ? He shouldn't of used 10/3 Wire for this 240V equip. The Red wire is not going to be used, correct ? As far as the 2-Pole Breaker, I will be attaching the white wire in the 2nd slot on the 2-pole breaker ? Do you have a Wiring Diagram ?
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Re: I have 2-240V (4.2V) basebaord heaters, Need Wiring...
You get 120V from any phase (black OR red) to neutral
you get 240V from phase to phase (between black and red) and in this scenario you don't need the white wire.
So for you, connect the black to 1 pole of the breaker and the red to the other pole, connect the green wire to the ground strip and you are done.
A white wire is NEVER connected to a circuit breaker anyway, it is a grounded wire, it would be like connecting a green wire to a black wire, bad idea.
the National electrical code specifies red and black wire color for 240VAC circuits.
As Ask Hank mentionned, nothing wrong with 10/3 wire.
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Here is a link to the wiring instructions, which has detailed pictures and instructions. This should make it a lot easier. http://www.marleymep.com/en/multimedia-library/pdf/fahrenheat-pdf/products/f2500-series/F2500wiring.pdf
Using the equation I = P/E where "I" is Amps, "P" is Watts, and "E" is voltage, we find that your 5000w circuit will have an Amperage of 20.83. A 22 amp tstat will work, it will just leave you no room for surges. I would suggest splitting the baseboard and using 2 thermostats. Hope this helps
you have baclk and red wire supply and a black and red wire to load (baseboard).
your switch will have 2 black and 2 red.
connect blk supply to 1 black on switch ( it doesn't matter which one)
connect red supply to 1 red on switch
connect black from baseboard to black switch
connect red from baseboard to red switch
if multiple baseboards that have several loads at thermostat then just connect baseboard blacks together and reds together before connecting at switch.
I am an electrician. You must measure the voltage across the black and red wires. Measuring each wire to the neutral will not cut it. If both your red and black wire are on the same phase the heater will not work.
To double check your wiring, measure the voltage across the two screws feeding your subpanel, they should be 240v or 208v depending on your power company. Then do the same at the breaker feeding your thermostat. Again it should read 240v.
If you have no potential across the screws it is possible that you installed an incorrect breaker. Not all breakers with two screws on them are 240v breakers. There is what is called a twin or split breaker that has two screws that are on the same phase. These are for wiring two 110v circuits, when you run out of spaces in the panel.
Double check everything. This is a relatively easy circuit to wire, even for homeowners. If the heater does not work them something is wrong so do not leave the circuit energized.