Isolated ground in dedicated room/new construction?

EDIT:

Also avoid running the three dedicated circuits parallel to other branch circuit wiring.

Should read:

Also avoid running the three dedicated circuits parallel in close proximity to other branch circuit wiring. Especially LED Lighting circuits as well as circuits with lighting dimmers. These circuits are the worse for inducing Harmonic Noise onto the Dedicated Branch Circuits.

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I would steer clear of 2-wire Romex. The hot and neutral run parallel along the flat length and this creates an RFI antenna. I use 10/3 Romex (orange sheathing) because the three wires are twisted, which helps attenuate common mode noise. I use the third conductor as a ground (make sure to tape the visible ends green) and clip the bare copper grounding conductor. This also has the added advantage that it can be converted to a 240V branch circuit in the future.

@jea48 

Do you mean the romex from the panel to the outlets should not be in close proximity to the romex from the panel to the lighting switches? Thanks

 

Ron

@ronboco

Yes, and that includes the branch circuit wiring from the load side of the switch to light fixture(s). When can lights are used in a ceiling it can be a challenge to route the new dedicated branch circuit cable(s) from the parallel running lighting branch circuit wiring. Same for maintaining a distance from the can(s) that house the LED lights.

@jea48 

Thank you for the info. I didn’t think about that when I built my room. I have LED track lights on dimmer switches. Would it present as sounding grainy /static? I figured the recordings that have some grain were from the recording.