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Cable Length Colours


Dominicg

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Good Afternoon,

 

Over a drunken converstation in a hotel room somewhere in London around half three in the morning we got on talking about labelling cable length by colour and the 'most commonly used way'. Steve the lighting guy said there was a rhyme to remember them along the lines of, "Richard of York Gave Battle in Vane."

 

What I'd like to know, is what was the rhyme, then by colour, Red, Orange, Yellow, Green, Blue, Voilet then the sizes :)

 

I'm sure it follows the resistor colour code but however I remember that a different way which I can't repeat on here :(

 

Cheers in Advance.

 

Dom.

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Red = 6, Orange = 18, Yellow = 9, Green = 7.5, Violet = 3,

 

Those lengths sound suspiciously like the closest equivalents to old imperial lengths... so violet = 10', Red = 20', green = 25', yellow = 30', orange = 60'. That would explain why there is no colour in that code for 10m, which is a common length these days, but not in imperial times!

 

I don't know how 'standard' that is though.

 

The code I use myself (which has no basis other than that I thought it seemed logical) is: White = 1m, Grey = 2m, Brown = 3m, Red = 5m, Orange = 7.5m, Yellow = 10m, Green = 15m, Blue = 20m, Violet = 25m. This roughly follows the rainbow colours as cables get longer, with the addition of white, grey and brown for very short lenths. Longer lengths than 25m get two bands 'added together'.

 

HTH

 

Ben.

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Good Afternoon,

 

Over a drunken converstation in a hotel room somewhere in London around half three in the morning we got on talking about labelling cable length by colour and the 'most commonly used way'.

 

Two observations...

 

1. Get a life, drunken hotel room conversations at half three in the morning should not be about cable length colour codes!

2. Everybody's system is different...

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"Richard of York Gave Battle in Vane."

 

It is a mnemonic with it origin stemming from the order of the colour spectrum (from lowest frequency, to highest, and hence the most popular use is to remember the order colours appear in a rainbow) ROYGBIV (often pronounced Roy G Biv) - Red Orange Yellow Green Blue Indigo Violet. Since it is a fairly common thing to need to know, resistor colour codes are loosely based around the same system.

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"Richard of York Gave Battle in Vane."

 

It is a mnemonic with it origin stemming from the order of the colour spectrum (from lowest frequency, to highest, and hence the most popular use is to remember the order colours appear in a rainbow) ROYGBIV (often pronounced Roy G Biv) - Red Orange Yellow Green Blue Indigo Violet. Since it is a fairly common thing to need to know, resistor colour codes are loosely based around the same system.

If you wish to remember it the other way round... Virgins In Bed Give You Odd Reactions...

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I'm sure we've discussed this before but...

 

There is no international standard of cable length indication (Certainly not an enforced international standard)

 

The standard "we" use is white = 10m, red = 5m, blue = 2m, green = 1m. The codes are additive and multiples of a colour can be used - so a 25m cable will have 2* white plus 1* red. 12m is 1* white plus 1* blue.

 

It's not based on a standard as far as I'm aware but it works for us.

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Does nobody here have black cables?

 

 

I do. And I expect that everyone else here does too.

They probably use black cables with either coloured plastic ends, tape or cable ties to mark the lengths. As opposed to the colour of the cable itself identifying the length.

 

The reason people don't use black markings is that you can't easily identify black markings on black cables.

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