thermocouple extension and 4-20 mA cable help please

[realolman]

I need to run some thermocouple extension wire for type k thermocouples, and a 4-20mA control circuit approx 150 feet.

do I need to get the same material as the thermocouple (type K is chromel aluminel)

would this be suitable?

1018A Multi-Conductor - Thermocouple Extension Cable

https://edeskv2.belden.com/Products/index.cfm?event=printPrev&pnum=1018A&ut=english


For the 4-20mA would this be suitable?

1118A Multi-Conductor - 600V Tray Cable
https://edeskv2.belden.com/Products/#catsid=563

If someone knows any better options please let me know

thank you

 

[GeorgeB]

I need to run some thermocouple extension wire for type k thermocouples, and a 4-20mA control circuit approx 150 feet.

do I need to get the same material as the thermocouple (type K is chromel aluminel)

yes, for the cable and terminal blocks, technically.

would this be suitable?

1018A Multi-Conductor - Thermocouple Extension Cable

https://edeskv2.belden.com/Products/index.cfm?event=printPrev&pnum=1018A&ut=english

I don't know how many you are running, but there is multipair thermocouple cable. I _PERSONALLY_ have never used as large as #16 ... 20 or 22 has been far more common ... but that's been for 30 or 40 feet. Oh, and ALL I've used has been solid.

For the 4-20mA would this be suitable?

1118A Multi-Conductor - 600V Tray Cable
https://edeskv2.belden.com/Products/#catsid=563

If someone knows any better options please let me know

thank you

The cables there appear to be shielded multi-shielded pairs which is customary. Voltage drop at 20 mA at that length is insignificant; only specifications and termination would require anything larger than #22. As for insulations, it depends on how it is being run ... I don't like to have analog (whether thermocouple or 4-20) in conduit or tray with power or switching control.

 

[realolman]

thank you

thank you

thank you very much .

I'm having a heck of a time with this.

Since the cables are going to be installed in the same cabinet with 480 v stuff do they need to be 600 v?

and I'd like the 4-20 mA to be shielded.


You have any specific cables you'd care to share?

 

[GeorgeB]

As for the voltage ratings, my experience has had the power and instrumentation separated sufficiently that low voltage (ribbon cable, even) may be used in the same enclosure with 480. I don't pretend to know the rules, and UL listing issues now come into play for NEW panels ... I know nothing how it applies to modifications.

As for the cables, much depends on how much you need; I pretend to be an engineer, not an electrician, and my DIRECT work is in using what you pull, not specifying it or pulling it. Your customer's requirements play a part, obviously, as well.

You will find that all the major manufacturers make multipair Tc extension cable. My own experience has seen Okonite, Carol, and Belden. The Okonite sheet, http://www.okonite.com/product_catalog/section5/Sheet21.html gives an example. They DEFINITELY all make multipair control cable. Much depends again on the quantity required and the companies your purchasing folks deal with. Any electrical supplier will have their favorites. A quick look at Belden's website shows 300V and 600V up to at least 12 pair ... I selected 12 pair 600V and came up with 4 products, 1043A, 1052A, 1067A, and 1073A ...

If you need a little, the folks at Omega (www.omega.com) have it, but they are said to be high priced in reel quantities. See http://www.omega.com/ppt/pptsc.asp?ref=4KX_MULTIPAIR_CABLE for reference.