Amplifier Wire Colour Coding Best Practice

[Sadface]

G'day Guys,

A question of best practice.

Is there a standard set of wire colours that can be applied across an amplifier?
I follow IEC colour coding for the mains side:
Live = brown
Neutral = blue
Earth = green/yellow.

For signals:
Right = red
Left = black
Signal ground = white

What happens when one gets to power supply wiring on the DC side?

I typically use:
B+ = brown
B- = blue
0V = green or yellow

Is there an industry standard or convention for DC power supply wiring?

What do other people around here like to do?

 

[JonSnell Electronic]

Mains
Live = Brown
Neutral = Blue
Safety Earth = Green/Yellow

Signal
Right channel = Red
Left channel= White
Ground = Black (or screen wire).

Power supplies
+ve = Red
-ve = Black
0v = Green

 

[Osvaldo de Banfield]

Positive supply: yellow,
Negative supply: blue,
Gnd: black.

As in 12V at PC supplies, is my rule.