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Old 04-01-2011, 08:37 PM   #1
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18/2 AWG and Doorbells


I searched the forums and can't seem to find the answer I am looking for. I have run 18/2 gauge wire from the front and rear door buttons back to the transformer, and also back to the main doorbell box. I also ran an one 18/2 cable from the transformer to the main doorbell box. The 18/2 has a white wire and a red wire in the sheathing. What gets connected to what at the transformer and main doorbell box? Do I splice the wires with pigtails to connect them or do I leave out the white and just connect the red wire?

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Old 04-01-2011, 10:38 PM   #2
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18/2 AWG and Doorbells


Here's a picture
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18/2 AWG and Doorbells-door-bell001.jpg  

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Old 04-02-2011, 09:00 AM   #3
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18/2 AWG and Doorbells


I have that same diagram in my instructions, but it doesn't say what to do with the white and red conductors. If I only hook up the red conductors and splice the whites together, will the circuit not have neutral? Thanks again.
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Old 04-02-2011, 09:19 AM   #4
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18/2 AWG and Doorbells


OK, they're in color. I used lt blue for the whites so it would show up.
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Old 04-02-2011, 12:55 PM   #5
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18/2 AWG and Doorbells


It doesn't matter which color wire you use for the low voltage circuit other than for your own convenience.

The low voltage circuit does not need a "neutral" per se. Unlike a 120 volt circuit, it is permissible to run single conductors, for example from the transformer to the button, from the button to the bell, and from the bell to the transformer. (As in the diagram above)

In the diagram above, the line up the middle can be thought of as a neutral because it is shared by, or common to, both the front door and back door circuits.

The low voltage wires, if they are in a single cable from the transformer to the doorbell, do not need to have either wire grounded. Neither wire may be connected to the neutral connected to the primary (input; here 120 volt side) of the transformer or to a neutral of a nearby 120 volt circuit.

Below is an example using both conductors in the 18-2 cables.
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18/2 AWG and Doorbells-door1.jpg  
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Last edited by AllanJ; 04-02-2011 at 01:27 PM.
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