wiring

[perry payne]

I am presently bought a construction heater witch as a 3 prong plug, it needs a 240 cct, I have a square D breaker box. I purchased a 3 prong reciticable, but the wire I am using as 4 wires, white,black,red, and the ground. How do i connect the wire to reciticalbe and to the breaker box. The breaker box is in my workshop. I also purchased a single 30 amp breaker, do i need a double breaker.

[Wgoodrich]

If this is an electric heater then no white neutral wire will be used normally. This is why you have only three wires coming from your heater. First we need the load in watts or amps stated on your name plate of your heater. Then we can tell you wire size and breaker size and receptacle style that you need. Look also on that heater to confirm that it say 240 volt single phase and not 120/240 volt single phase.

Also tell us what size 4 wire cable you are using is it 10 awg copper? It this 4 wire cable rubber cord or Romex? Are you running this wire from the panel through the walls or ceiling?

Curious

Wg

[perry payne]

The heater is a 240 vac, 4800w, 30amp, i am using 10awg copper wire and running it through the wall. If i don't use the white wire i still do not know what to do with the red in the breaker box

[perry payne]

Originally Posted by perry payne

The heater is a 240 vac, 4800w, 30amp, i am using 10awg copper wire and running it through the wall. If i don't use the white wire i still do not know what to do with the red in the breaker box

[Wgoodrich]

YOu will need a double pole 30 amp breaker in your panel. You should wire nut capped off you white wire inside the panel and inside your receptacle box. Then you must connect your red wire and black wire to the two lugs of the breaker and the green or bare wire to the grounding bar inside your panel. Do not connect that white wire at all. Just wire nut it off as unused.

You will need a 30 amp 240 volt receptacle matching hte plug on the heater cord. Connect the red and black wire to the two brass screws and then green wire to the green screw of that receptacle. Make sure this receptacle is mounted in a receptacle box.

YOu may use a 10/2wGrnd cable using the black and white as the red and black above connecting to the two lugs of the breaker and without a red wire, or you may use a 10/3wGrnd using the black and red wires connecting ot the two lugs of the breaker and wire nut off unused the white wire. Either way connect the green or bare wire to the grounding bar in your panel and to the green screw of that receptacle.

Let us know how you come out.


Wg

[Rod Norris]

I am trying to wire 2 light fixtures with 1 switch. I have run 12-2 with ground to the 2 fixtures and switch. I have tied into power from an existing outlet. I have power at outlet and at wire leading from outlet to 1st light fixture and have wired according to the web site's wiring help outline. My light tester shows a low amount of current at switch and lights don't turn on.
Is the 12-2 wiring too much resistance for power flow to new lights from outlet power if it has existing 14-2 with ground wiring?

[Wgoodrich]

At the receptacle make sure you have connected the black wire to the black wires and the white wire to the white wires of that receptacle.

At the light box where you have the power going to from that receptacle make sure you have a 12/2wGrnd cable from that certain light box running to the switch box and a second 12/2wGrnd cable from that same certain light box running to the second light fixture.

Since you opted to bring power to the first light box then the switch leg and also the cable going to the second light box must be in that same light box.

Then bend back the switch leg cable in that light box for later use.

Then connect the black wire of the light fixture and the black wire going to the second light box and the black wire of that bent back switch leg all together under one wire nut.

Then connect the white wire of that bent back switch leg cable to the black wire coming from that receptacle and its own wire nut.

Then connect the white wire of the light fixture and the white wire going to the second light box and the white wire coming from the receptacle all together under one wire nut.

Then connect all bare and green wires together under one wire nut.

IN the switch connect the black and white wires to the two screws of the switch device. Connect the bare wire to the green screw on the switch

Then in the second light box connect black to black and then white to white and then bare to green or bare.

You should have it running.

No you have misswired that project it does not have a low voltage problem due to the 14 awg wire feeding it.

Hope this helps

Wg