Is blue neutral or earth when there is a black cable (which is the old neutral) - old system? Other one is red, no green / yellow
Discuss Red, blue and black cable in the UK Electrical Forum area at ElectriciansForums.net
I think you need to elaborate as you aren't making much sense. The conductors you describe can serve any purpose providing they are correctly identified.
In some older buildings where there was 3 phase supplies serving single phase loads, and the installation was singles in conduit…. The phase colours were used.
So normally where you would see red, black and g/y, you could have yellow, black, g/y or blue, black, g/y
If metal conduit, there may be no green/yellow…
What is the situation you have found?
BTW, @buzzlightyear why is your diagram showing the cores in the wrong order? Old 3 core and earth is red, yellow, blue…. And your new cables on the right are similarly mixed up…. Should be brown, black, grey.
I’m not 100% certain the cpcs are in the right place either.
So normally where you would see red, black and g/y, you could have yellow, black, g/y or blue, black, g/y
If metal conduit, there may be no green/yellow…
What is the situation you have found?
BTW, @buzzlightyear why is your diagram showing the cores in the wrong order? Old 3 core and earth is red, yellow, blue…. And your new cables on the right are similarly mixed up…. Should be brown, black, grey.
I’m not 100% certain the cpcs are in the right place either.
6 Changes to cable core colour identification
Table 7B – Cable to BS 6004 (flat cable with bare cpc)
| Cable type | Old core colours | New core colours |
| Single-core + bare cpc | Red or black | Brown or blue |
| Two-core + bare cpc | Red, black | Brown, blue |
| Alt. Two-core + bare cpc | Red, red | Brown, brown |
| Three-core + bare cpc | Red, yellow, blue | Brown, black, grey |
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