Greyish Blue Colour Code
Ptolomeo Shop
Depending on the type of production used, different colour names are assigned to the hydrogen. But there is no universal naming convention and these colour definitions may change over time, and even between countries.
Green hydrogen is made by using clean electricity from surplus renewable energy sources, such as solar or wind power, to electrolyse water. Electrolysers use an electrochemical reaction to split water into its components of hydrogen and oxygen, emitting zero-carbon dioxide in the process.
Green hydrogen currently makes up a small percentage of the overall hydrogen, because production is expensive. Just as energy from wind power has reduced in price, green hydrogen will come down in price as it becomes more common.
Blue hydrogen is produced mainly from natural gas, using a process called steam reforming, which brings together natural gas and heated water in the form of steam. The output is hydrogen, but carbon dioxide is also produced as a by-product. So, the definition of blue hydrogen includes the use of carbon capture and storage (CCS) to trap and store this carbon.
Currently, this is the most common form of hydrogen production. Grey hydrogen is created from natural gas, or methane, using steam methane reformation but without capturing the greenhouse gases made in the process. Grey hydrogen is essentially the same as blue hydrogen, but without the use of carbon capture and storage.
Using black coal or lignite (brown coal) in the hydrogen-making process, these black and brown hydrogen are the absolute opposite of green hydrogen in the hydrogen spectrum and the most environmentally damaging.
Japan and Australia announced a new brown coal-to-hydrogen project recently. This project will use brown coal in Australia to produce liquefied hydrogen, which will then be shipped to Japan for low-emission use.
In addition, the very high temperatures from nuclear reactors could be used in other hydrogen productions by producing steam for more efficient electrolysis or fossil gas-based steam methane reforming.
This is a new entry in the hydrogen colour charts and production has yet to be proven at scale. Turquoise hydrogen is made using a process called methane pyrolysis to produce hydrogen and solid carbon. In the future, turquoise hydrogen may be valued as a low-emission hydrogen, dependent on the thermal process being powered with renewable energy and the carbon being permanently stored or used.
These Red, Green and Blue colour codes are used in digital representation of colour. These three sets of codes create wide representation of colours on the screen. Although it is critical to see the paint colour in person, the digital representation gives the idea when we research colours at home.
When using breadboards / stripboard / Fritzing / etc, are there conventions for which colour wires to use?
The following make sense to me:
Gnd = Black
V(supply) = Red
Q1, Q2, Q3, Q4, etc = Brown, Red, Orange, Yellow, etc
But are there any other conventions or is it all arbitrary?
And what is good practice if you have 12v, 9v and 5v all on the same circuit?
I know of no convention, but I know that using a consistent system will help a lot toward avoiding wiring errors. Like you I use black for ground, red for 5V. I use yellow for 12V and orange for 3.3V. The usually colors for pin numbers from the resistor color code. So a wire from pin 3 of the Arduino would be orange, pin 4 is yellow, etc.
If you are using I2C regularly I found the Gray/blue to be extremely helpful when wiring hardware. I no longer even have to think about which is SCL and which is SDA. Oh you could use any two colors as long an you are consistent and write it on a post-it at your bench until its ingrained in you brain
Anything can work, as long as you are consistent. Just don't do it backwards, or contrary to widely used conventions, like red for ground and black for vcc, unless you want to find yourself in trouble.
Years ago I built a kit which used 5 different supply voltages, some positive and some negative. I used rainbow ribbon cable to distribute this and used the progression red-orange-yellow-green-blue for the voltages from most positive to most negative. Plus black for ground.
The only wiring colour code I know of it the "BT standard colour code" used for telephones in the UK.
A limited sub set is used when a telephone socket is connected in your house, but the full colour set uses striped wire and that allowed hundreds of numbers to be defined based on the stripe and background colour.
It's not just the telecoms industry. Regular readers will know telecoms is my industry, but my brother worked in power stations. My brother told me that power stations use the same cable and the same colour code for control signals.
Several years ago there was a telephone lineman working on our street. I stopped and asked him if he could spare a few feet of the, probably, 50 pair 24 gauge stuff that they use. He said sure and gave my a nearly empty spool with, must have been, 20 feet on it. I doubt that I will run out of it in my lifetime.
Since I found the multistrand silicone wire one could by on ebay, I've used nothing else. This stuff has many strands, I think the #22 has 50 strands. The results is the wire is limp. It does not move the boards or sensors I've used it on and it doesn't melt when soldering it to a board.
We're ordering some machinery from China and need it manufactured to Australian electrical standards including the wiring colour code. Unfortunately we don't have any electricians or engineers that work here (I'm an engineering student) and online all I've been able to find is info in forums - it seems government makes you purchase standards documentation. Some sources I've found indicated:
The wiring may also come with no colour code at all. For example, all the wiring might be gray, with wires identified by numbers or labels - this is also permissible by AS 3000. German equipment, in particular, often comes like this - a baffling collection of gray spaghetti.
Therefore, writing a specification that "all wiring colours shall comply to AS 3000" is a pretty weak specification. It's better to specify that three-phase power circuits shall be identified by colours, and the acceptable colours are - red, white, and dark blue for phase conductors, black for neutral, and green/yellow for earths.
For single-phase wiring, I've seen both a) red active / black neutral, and b) brown active, light blue neutral (European style.) AS 3000 allows for both - so long as you don't mix the two colour schemes in the same installation.
Based on my web research, it appears that Australia follows standard AS/NZS 3000. If you want an absolutely authoritative document, you will have to purchase the latest version of that standard, or find a place (maybe a library) where you can review it. In that standard, it is recommended that three-phase colors used in a building be red/white/dark blue. It is not required. It is just suggested. A number of colors are prohibited from being used for phase wires.
However, Europe follows IEC 60446. That standard uses the grey/black/brown scheme. Apparently AS/NZS 3000 allows you to use the EU color code also. Some websites are saying that the IEC 60446 color code is actually recommended or required for EQUIPMENT sold in Australia.
So I would say that if your product may be dual marketed into EU countries, you should consider using the EU color codes. Australian electricians will probably be familiar with it, and it is "legal" in Australia. But the other color code could cause problems in the EU market.
Nobody has actually quoted the real 'machinery' standard for Australia which is AS60204. This standard will help you to specify what you actually want including the lamp and control button standards. AS/NZS 3000 is ONLY for fixed wiring not machines.
I've always thought our Mk2.5 was Avalon Blue (that's what's on the sales docket) but I've just been doing a search for the colour code and it now looks like it's Avalon Grey. To me it looks blue rather than grey. Various sites give different codes for this colour, 8CKE, 8CKEWWA or M8. This latter code appears on the sticker in the driver's door shut.
I've just tried to contact my local Halfords on their local number but after getting the usual menu the system diverted the call to somewhere else entirely. Eventually I asked if I was speaking to Halfords and the woman said no. I then tried Live Chat who advised I call customer service, which I did, to be told that Halfords don't provide a paint mixing service. So what's the chance of finding my colour on the stand? I'm not inclined to make a special journey just to discover they haven't got it.
There's probably at least one car paint mixing place on an industrial estate near you. No idea how much they'd charge but it's probably worth Googling. They'll match the colour to your own paintwork so it should be perfect.
I'd still like to know for sure if the code I found on the sticker is the right one, though. I'm fairly confident as one of the sites described where it is on the sticker and the code in that position matches what I found on another site.
The trick is that projects existed and had to be backwards-compatible, so we have special-case code for those. Nobody thought or noticed at the time that custom fields would also need to use this translator to stay consistent, so the underlying names poke through there.
So, I created new tags, using the API, with these 3 colors.
The API does not returns error, but it changes the color.
dark-blue becomes light-blue
dark-warm-gray becomes light-warm-gray
light-yellow becomes dark-brown