Brian Hamilton
Member
Hi there, i was hoping for some oppinions from you all with regards to colours on +24VDC and -0VDC wires should be?
To me the most common combination i have seen in a huge amount of panels and this is also in accordance with BS EN60204-1.
BLACK - AC POWER CIRCUITS (400V AC etc)
RED - AC CONTROL CIRCUITS (110V AC)
BLUE - DC CONTROL CIRCUITS (+24V DC)
Although there is no reference to Blue/White i would say its common place although i have seen the use of all blue for both +24V and -0V.
But why is there other combinations such as blue/red (common for phenoix contacts who have jumper bars and distribution terminals that use blue/red for +24VDC and -0VDC connections?
I use to work one place that always used white/red (+24V DC) and white/black (-0VDC) and white (switched +24VDC) - has anyone ever seen anything like this before? Never seemed to be appropriate to any standards i have read...
If anyone else has any oppinons especialy any regulation guidelines to US specifications i would be glad to hear your thoughts and oppinions?
Thanks,
Bri.
To me the most common combination i have seen in a huge amount of panels and this is also in accordance with BS EN60204-1.
BLACK - AC POWER CIRCUITS (400V AC etc)
RED - AC CONTROL CIRCUITS (110V AC)
BLUE - DC CONTROL CIRCUITS (+24V DC)
Although there is no reference to Blue/White i would say its common place although i have seen the use of all blue for both +24V and -0V.
But why is there other combinations such as blue/red (common for phenoix contacts who have jumper bars and distribution terminals that use blue/red for +24VDC and -0VDC connections?
I use to work one place that always used white/red (+24V DC) and white/black (-0VDC) and white (switched +24VDC) - has anyone ever seen anything like this before? Never seemed to be appropriate to any standards i have read...
If anyone else has any oppinons especialy any regulation guidelines to US specifications i would be glad to hear your thoughts and oppinions?
Thanks,
Bri.