OP
SPARK2B
I know two colour blind electricians and they do not seem to have any problems. They are both green/brown/red colour blind. They're both qualified so they must have either passed any test they were given or there was no test.
I think its more down to how colour blind you are, so its up to you to decide if its a problem.
If you do have to have a test then I suggest these EnChroma | Color For The Color Blind or just search for chromagen glasses.
Colour blind tests just get you to distinguish shapes or numbers, which you must have taken as a child. The above glasses dont help you to know what the colour is but they do enable you to see the difference between the colours enabling you to pass the test.
Good luck.
.....that....is.....AMAZING!!!