Can trip signals and relay faulty alarm be combined in the same cable?

[Tamer AbouTaleb]

Hi,

I'm designing 33kV feeder protection panel, and I wonder if I can have trip signals and relay faulty alarm in the same cable?

Thanks,
Tamer

 

[marks1080]

I'm not going to site any standards or codes (not sure where you are) but here's good advice:

Don't mix AC and DC in the same cable, and it's good practice to separate different DC voltage levels as well (eg: don't but 48V and 125V DC in the same cable).