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How do I wire a federal pioneer wall heater 240v with 2 wires there appears to be only 2 load wires to attach to and a bare ground where does a neutral conect to? Thanks Ross

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If you are certain that the heater has only two wires and that it is a 240 volt unit, here's what you do:
Bring in a 240 volt line.  There are three wires.  The red and black are the opposite phases and are each 120 volts above ground/neutral.  Connect them to the load wires.  If there is a neutral, connect that to the white wire, even if it is bare wire.  Bare wire and white are the same for all practical purposes.  If the unit has a fan, it will run on the neutral/white and one of the phases. Wire sizing is important.  Make sure you have a properly sized wire for the job Up to 20 Amps, use #12 wire.  If over 20 Amps rated, use #10.  Fuse appropriately.  
Make sure the power is off when doing this work!  240 will KILL YOU.

Posted on Nov 23, 2008

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WH40 water heater timer: Does black wire from service box go to terminal #1 and black wire to water heater to terminal #2? Does neutral (white) from service box go to terminal #3 and neutral (white) to...


WH40 is 240Volt timer.
WH40 will not work with 120V circuit.

See WH40 wiring illustration at following link:
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html

There are two hot wires in 240V circuit because every circuit requires two wires to complete the circuit.
Hot wires from breaker connect to terminal 1 and 3.
Notice that small white wires are also connected to terminals 1 and 3.
Small white wires power clock motor located on back of mechanism, so this says power from breaker box must arrive on terminals 1 and 3. This insures that clock motor runs continuously.
If clock motor only runs when manual override switch is clicked ON, then your Hot and Load wires are reversed.

Bare ground wire connects to green ground screw.
Wires going to Load (water heater) connect to terminals 2 and 4.

FYI: Terminal A is not used unless circuit also has a Neutral wire,
See basic water heater circuit Diagram #2:
http://waterheatertimer.org/240-v-water-heater-circuit.html

Terminal A is also used if you want to convert WH40 to 120V timer by replacing 240V clock with 120V clock.
How to convert Intermatic 240V timer to 120V timer
http://www.fixya.com/support/t7353947-intermatic_timer_wg

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70 amp stabloc panel, using 8/3 to panel from 40 amp main breaker at 200 amp panel. white wire to white, black to black? red wire to ? thanks


Depending on what type of wire you have, 8/3 is not large enough for a 70A breaker. Is this a 240V circuit? or 120V If you are using 8/3 is it 8/3 WG that is 3 insulated conductors (red,black,white) along with bare ground? If so then you'd use the black and red for the two "hot" conductors, and the white for the "neutral" conductor. If it is just two insulated conductors, with ground (white, black and ground) then yes black to breaker and white to neutral bar. The amperage rating will vary on the wire depending on wire type. For example 8/3 is in NM? usually that rating will not be enough for 70A. In fact even #6 copper conductors in conduit is not quite large enough for 70A.

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1 Answer

How do you wire a intermatic t103


I'm looking at the T-103 sitting here in my office.
Terminals are labeled: A 1 2 3 4
I have about 10 different Intermatic timers on the shelves & each is a bit different

The T103 has a 120Volt (or 110V) clock motor
You need a white Neutral wire to operate the T103 clock

120V: Let's say your Load (light, fan, pump) is 120V
The white Neutral from breaker box connects to Terminal A
The 120V black Hot wire from breaker box connects to Terminal 1
The black wire going to Load (fan, light, motor) connects to terminal 2
The white wire going to Load connects to terminal A along with the Neutral
Ground wires connects to green ground screw
If your wires from breaker and wires to load are wired in reverse, the timer will turn ON the Load but the timer will not shut the circuit OFF.
To test which wire is Hot and Neutral, look at explanation at bottom of page.

240V: Let's say your Load is 240 Volts (or 220 Volts)
The clock motor is still 120V so you still need a white Neutral wire connected on Terminal A
Now you have 2 Hot wires coming from breaker box
Hot wire 1 from breaker box connects to Terminal 1
Hot wire 2 from breaker box connects to Terminal 3
Wire 1 going to Load connects to Terminal 2
Wire 2 going to Load connects to Terminal 4
Ground wires connects to green ground screw

What if you don't have a Neutral wire and you are wiring a 240V circuit?
240V circuits normally have 2 hots and a ground, but no neutral
Buy the T-104 timer
The T-104 has a 240V clock motor
Wiring for the T-104 is exactly the same as 240V wiring shown above for T103 EXCEPT there is no Neutral on Terminal A, and Terminal A is bare
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

How to test which wire is Hot
Test requires wires with live electricity >>> this is not advisable without precaution
Stand on dry boards, do not touch anything metal, wear dry clothes, do not hold screwdriver in mouth, wear gloves, tape tester leads to wood sticks so hands are away from power
Remove wires from terminals
Separate wires so they can be tested
Turn on power
Test each wire to bare ground wire
Tester lights up on Hot wire(s)
If circuit is 120V, then there is only one Hot wire
If circuit is 240V, then 2 wires will test hot to ground >> these wires will be Hots 1 & 2
Test assumes circuit breaker is functioning normally.

How do you test for neutral?
If you have 120V line with only 1 hot wire, then one of the white wires will be Neutral?
Test Hot wire to each white wire
Tester lights up on neutral

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Hello. The red and the black are the hot wires. Therefore, connect one of your conductors to the red and the other conductor to the black. Use wirenuts. The bare ground wire should be solidly attached to the new unit's green wire using a wire nut.
Regards, Joe
PS: please rate my answer. Thank you.

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This is not to code. The white is neutral and is of the same polarity as a bare wire. The red and the black are considered hot and would be 220.

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1 Answer

How do I hook the wires up for a electric baseboard heater


this heater can usually be wired from either side. meaning your wiring can be brought through the wall inside of one side or the other.

the wiring you bring in to this unit needs to be 12g or larger.

it needs to be on a dedicated circuit. that means you cant splice into any other line. it needs to be for your baseboard heaters alone. that is code and wouldnt want to sleep in a house with baseboard heat that didnt have a dedicated circuit.

baseboard heat is most economical to run with 240v units. 120 is going to cost more to run.

you will need a thermostat either built into the unit or a thermostat unit mounted in the wall to run it.

dont mount the thermastat over the heater. I shouldnt have to explain why.

a 240 volt circuit run from your panel on a 20 amp breaker consists of 3 wires, a ground and a black and white.

in a 240v configuration both the black and white are hot and you must wrap some black tape around the white wire where it shows in your breaker panel and at the handy box in which you have installed the thermostat and then where it enters the heater. this re-designates the wire as a hot instaed of nuetral this gives you to black hots.

you hook the white and black wire to the line in side of the thermostat which should be the two red wires.then the two black load out wires of the thermastat run to your heater. hook your ground (green or bare) to the box if its metal and pig tail it to the ground screw on the thermastat, then out of that pigtail to the heater along with the two hot wires.

you will find a bare ground solid copper wire fixed to the inside connect your ground.

you will find two other wires they are both hots you will connect one of your hots to one of them and the other to the remaining.

what it looks like is an element sitting in the housing the housing is the baseboard and you have a hot wire running through a wire way to the other side and connecting to it and one hot stays on the side you brought the wires to.

in other words since you can wire it from either side you have to have a way to get the energy to one side or the other and they supply a way.

as long as this is labled as a 240 unit both wires are hot. take the covers off both ends you will notice the wire traveling from one side to the other. your goal is to have one hot connected at one end of the fillament and the other hot you brought in to the other end. the best way to hook up multiple heatrs is to have branch lines from the thermastat toeach heater, not to daisychain them one to the other becuase you will have voltage drop as a heater is using it before passing the voltage down the line leading to poorly functioning heaters








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I have 2-240V (4.2V) basebaord heaters, Need Wiring Diagram


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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The black and white wires should both go to the breaker. Not just the black wire. If you hook only the black wire to the breaker then you are only feeding the unit with 110 instead of 220. Both wires need to be hot.

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Your question is kind of vague, but the 240v goes to the heating element, if the heater has a fan, it may be a 110v, so the white is common and should be wired as such. The heater should have a wiring diagram on it.

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