Signal (4-20mA) with network cable

[QES]

Do you guy see any problem running your signal and network cables in the same conduit?

 

[zbang]

No problem if the cables are rated for the installation.

 

[nawao]

Network cable

Network cable

Network should be wired on a separate conduit.
Analog signal cables should be wired with shielded pairs, grounded at one end.

 

[zbang]

Network should be wired on a separate conduit.

Why? TP Ethernet is a transformer-isolated balanced signal, and current loop interfaces also tend to be balanced, at least as far as the sensor is concerned. They also IME tend to be very low speed (data-wise) and noise-insensitive, which is why you use them. Also IME they're usually wired with shielded cable, anyway.

 

[weressl]

Network should be wired on a separate conduit.
Analog signal cables should be wired with shielded pairs, grounded at one end.

Not reason to do that, except job security.

 

[Jraef]

I think Signal AND/OR Network cables should be separated from Power, but not from each other.

 

[jdsmith]

The industry standard for separation of different voltage levels and signal types of electrical cable is API 552. I've attached a table out of API 552 with the recommended separation distances. Notice that these distances are based on five different levels of signals. Signals of the same level do not require separation, and it appears that ethernet and 4-20 mA signals are both level 2: DC signals under 28V.

 

[QES]

Thanks for the table. I guess I will run my signal+network+24VDC control, and 24VDC power in the same conduit.

 

[QES]

Thanks for the table. I guess I will run my signal+network+24VDC control, and 24VDC power in the same conduit.

 

[nawao]

I cannot see ethernet signals in the table.

 

[zbang]

I cannot see ethernet signals in the table.

Well, there definitely more than millivolt signals, but less that 50v. Were would you put them.

 

[nawao]

Network wiring

Network wiring

According to the table:
Ethernet network signals level L1.
4-20ma analog signals level L2.

 

[zbang]

According to the table:
Ethernet network signals level L1.

Not sure how you get that, TP ethernet is in the 2-3 volt range.