"newshound" wrote in message
o.uk...
On 12/11/2017 22:20, Steve Walker wrote:
On 11/11/2017 14:50, Robin wrote:
On 11/11/2017 13:49, Steve Walker wrote:


Ah, fair enough. But each indicator should be labelled anyway. Coloured
indicators for each phase will still appear lit or not to a colour blind
person, so noworse for them than them all being white.

Incidentally though, it is normal on many control panels for green and
red lights to be used for running and stopped. Many people are red/green
colour blind, so they have to look harder at labels.

On screen control systems often have devices or valves that are green for
running or open and red for stopped or closed. I wonder how many
operators are tested for colour blindness?


I was involved in the design of some new control kit in the 2000's and the
then mandatory Human Factors assessment lady more or less vetoed any
coloured lights.

Ah the standard "a few people can't do it so we'll drag everyone else down
to that level" approach of H&S, Human Factors, political correctness etc.
:-(