I have a new stelpro electric heater 240v to install. The wall wire is also a 240v, it has been tested. 2 blacks wires and a green one are coming from the heater. The wire from the wall has only one black one white and one green wire.
The heater green wire goes with the green wall wire (ground). What about the rest of the wires?
Thanks
Wiring – how to connect an electric heater with 2 black wires to the wall
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Related Solutions
Not sure what make and model dimmer you're trying to install, so I'll describe a common installation. Wire colors could vary, depending on manufacturer.
- Black is the common terminal, and is attached to the ungrounded (hot) conductor feeding the switch.
- Red is the switched lead (or a traveler in a 3-way installation), and is attached to the switched hot going to the light.
- Red with white is a traveler, used for 3-way installations. In your situation, you'll just cap this one off.
- Green is ground, and is attached to the grounding conductor.
From Lutron Luméa® Installation Guide
If you don't have grounding conductors in your home, you could install a GFCI breaker and you'll be code compliant.
Lutron devices typically have a red and a red/white stripped wire, whereas Leviton has two red wires.
I assume you are in the USA. The heater is probably a pure 240V load with no need for the neutral (white) wire. you should simply cap the white wire with a wire nut and tuck it back into the electrical box.
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Best Answer
They don't make cables with black/black/green
Since /2 cables do not come in black/black/green as a color combination, and running neutral to a heater that will never need it is rather pointless anyway, the previous installer ran a regular /2 cable (black/white/green) and used the black and white as the two hots.
So, with the power off, connect one heater black to the black from the wall, the other heater black to the white from the wall, and the greens together and to a box grounding pigtail if the box is metal. While you're in there, put a wrap of black electrical tape on the white wire from the wall to mark it as a hot and save the next installer the trouble.