robertpartain
Member
What is the code section for seperation of analog/discreet instrumentation cable runs?
Analog / discreet cable run
- Thread starter robertpartain
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ron
Senior Member
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- New York, 40.7514,-73.9925
Re: Analog / discreet cable run
Are these circuit of different classes (class 1, 2 or 3)?
It may be just a design issue.
Are these circuit of different classes (class 1, 2 or 3)?
It may be just a design issue.
robertpartain
Member
Re: Analog / discreet cable run
You are correct it is a design issue they want to run analog and discreet in the same multi conductor cable.
You are correct it is a design issue they want to run analog and discreet in the same multi conductor cable.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Re: Analog / discreet cable run
When you find the definitive answer please let me know.
My experience has been:
24VDC discrete (digital) circuits can usually be run in close proximity and parallel to 4-20mA signal without many problems. However, inductive loads (especially solenoids) turning on and off may cause momentary errors on the analog circuits.
The higher the VAC signal the more likely it is to cause problems. Also 0-10VDC and any mV analog signals are probably more prone to interference from other circuits.
When you find the definitive answer please let me know.
My experience has been:
24VDC discrete (digital) circuits can usually be run in close proximity and parallel to 4-20mA signal without many problems. However, inductive loads (especially solenoids) turning on and off may cause momentary errors on the analog circuits.
The higher the VAC signal the more likely it is to cause problems. Also 0-10VDC and any mV analog signals are probably more prone to interference from other circuits.
robertpartain
Member
Re: Analog / discreet cable run
Thank Jim, that was my take on the matter, but to keep from having to pull more cable one of the design engineers decided to run analog and discreet in the same multi conductor cable. Agreed as long as, as you say, nothing switches on or off everything is hunky dory. When I find a code or spec that pertains I'll let you know.
Thank Jim, that was my take on the matter, but to keep from having to pull more cable one of the design engineers decided to run analog and discreet in the same multi conductor cable. Agreed as long as, as you say, nothing switches on or off everything is hunky dory. When I find a code or spec that pertains I'll let you know.
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
Re: Analog / discreet cable run
I do not think you will find anything in the form of a code. Sometimes a manufacturer will detail what is acceptable by them. Then it must be installed per manufacturers instructions.
I do not think you will find anything in the form of a code. Sometimes a manufacturer will detail what is acceptable by them. Then it must be installed per manufacturers instructions.
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