Black should be ground

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An unlabeled black wire should always be ground, no matter what.


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Ian A Jul 11, 2018
So it seems that through the generations, the colors have changed a bit, and this has been brought up before.

I like the resistor color codes, and the white labeled heat shrink is a start to trying to fix this.

The harness I have uses black wires for ground, which I like, but also black for channel 0, which I don't like.

Here's an idea though that I think is a decent compromise:

I understand that as EEs we like to start counting at 0. But perhaps an exception is in order. If you start counting your inputs at 1, then you can keep the resistor (and MIL standard) colors, AND you would eliminate the black wire nightmare.

As long as the channels match up on the wire labels and the software, I don't think anyone is going to miss channel 0.

I would much rather have no channel 0 than Black for channel 0 and its ground.

Doug_J Jul 11, 2018
Put your own heat shrink on your ground lead if it confuses you.
I like black = 0, and I don't mind grey = ground.

Maybe an off-black color for the ground clip is the answer.
Supply a green test clip with each kit for ground, and one for Vcc in red.
The rest are black, or offer a rainbow pack when ordering.

HansD Jul 11, 2018
There is a difference between Safety Ground (Earth Ground for AC Mains) and Logic Signal Return/0V. Yellow and green is common for Earth Ground. Black is common for Logic Ground. Keep the Ground leads as black on black.

bertje Jul 11, 2018
Are the people suggesting green as color for the groundlead complete electronics noobs or something? Ground potential is always black, and is something completely different than mains safety-ground/earth.

Matthijs Kooijman Jul 11, 2018
It seems this idea was somewhat implemented already - my new Logic8 that just got delivered uses black wires for ground. It still uses a black wire for channel 0 as well, but because each channel wire also has a white label wrapped around the end of it, this should no longer be confusing.

gx1400 Jul 11, 2018
I recognize and appreciate the adherence to MIL-STD-681 (www.rbracing-rsr.com/downloads/wiring_pdfs/spec55_colorcode.pdf).

If you move away from this color coding style, please, please, please move completely away.

My suggestion would be to move the ground to pin 1 in the future and keep the color coding.

John_K Jul 11, 2018
In terms of AC power, sure green is ground but in DC consumer electronics black is the typical convention for GND/- connections. I continually forget this with Logic and have to go back and swap wires.

Gray has no common usage as GND and is confusing.

LesG Jul 11, 2018
Black as ground makes no sense. Green or green/yellow is ok BUT putting green/yellow earth wire is making a statement about mains earth potential. That is not good for isolated things like laptops.

I don't think there is an ideal solution to this but using a non-standard non-single-colour would be preferable.

Black with a green stripe would be unambiguous and would not clash with the mains safety earth colour.

Guest Jul 11, 2018
I also support yellow/green rather than grey and keep black as zero

DougC Jul 11, 2018
For those who remember the resistor color code, the current colors are useful. Please leave black for channel 0.

Jeff Jul 11, 2018
Green is usually ground, but I like the choice for channel five better. Ditto for black and channel zero. I agree that green-yellow would be a better choice than grey.

DeweyOxberger Jul 11, 2018
In bench connections red is usually (+) and black is usually (-) but in the EN60000 series standards ground is usually green or green-yellow striped. Personally I'd go with green-yellow. It stands out.