Different voltage grade of cable on same cable tray
Different voltage grade of cable on same cable tray
(OP)
We have two different cable groups, 600/1000V(U0/U) for Low Voltage Power and control and 150/250V for instrumentation. Power is Ac690V and 400V AC. Some power control cables (for dry contacts) are driven by AC110V and DC24V employed as 150/250V cables. In the case that those power control cables(150/250V grade) are laid together with 690V power cables on the same cable tray, I do not see any problem but is was raised by someone as per spec. The mentioned problem is that earth fault power cable by damage causes insulation grade of control cable(150/250V).
I'm not sure if this is problem in technical point view or this is specification problem only.
Anybody helps my difficulties, please ?
I'm not sure if this is problem in technical point view or this is specification problem only.
Anybody helps my difficulties, please ?






RE: Different voltage grade of cable on same cable tray
RE: Different voltage grade of cable on same cable tray
RE: Different voltage grade of cable on same cable tray
RE: Different voltage grade of cable on same cable tray
RE: Different voltage grade of cable on same cable tray
RE: Different voltage grade of cable on same cable tray
Above 600V, the basic rule is that the lower voltage circuits must be physically isolated from the the high voltage circuit by a metal barrier and **cannot** occupy the same raceway. Mixing would only be allowed for the narrow exceptions provided in 300.3(C)(2).
Your example of motor control conductors and motor power conductors would generally NOT be allowed in the same conduit if the motor feeder was above 600V. They can be in the same motor starter enclosure or within the same motor terminal box, but could not share a conduit or cable tray.
This rule is fairly sacrosanct in the US, at least in my experience. In fact many electricians insist that 480V and 120V circuit cannot be run in the same conduit, but this is incorrect as noted above.
RE: Different voltage grade of cable on same cable tray
Now maybe someone can answer the OP question concerning Europe.
RE: Different voltage grade of cable on same cable tray
You all helps me a lot.
RE: Different voltage grade of cable on same cable tray