ATS/Generator Control wires

[sfav8r]

Let me ask the OP this. What type, brand generator are you talking about? If you are speaking of something like the residential Generac units then you would only have class I control wiring. When utility power is lost on N1 N2 it drops a relay out in the and the generator cranks. It is the voltage from the generator that energizes a relay in the ATS to do the switching. There is no back and forth "talk" between the gen. and the ATS.

Well, I agree and disagree. In the scenario you mention it would be a class 1 circuit, but often there are status lights such as battery status that are low voltage and are active during the presence of utility power. On the job that raised this question (Gilette 20Kw), there is the remote start, Battery Condition, and Charge Indicator (charging or not charging).

 

[infinity]

Not every class 2 or 3 circuit can be re-classified as class 1. For example if you use a power supply that is class 2 or class 3 only then you cannot use chapter 1-4 wiring methods and re-classify as Class 1.

 

[GoldDigger]

My understanding of that issue is that you can freely use chapter 1-4 wiring methods with a class 2 power supply. What you cannot then do is attach to the circuit a load or control device which mandates a class 2 power supply. You cannot reclassify the devices as class 1.
Looking at it another way, you cannot take advantage of the reclassification to allow things like running in the same raceway as power circuits and still also take advantage of things which are allowed for class 2 circuits but not class 1

But if the instructions on the supply require you to use only class 2 wiring methods, then I guess you do have to respect those
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[infinity]

My understanding of that issue is that you can freely use chapter 1-4 wiring methods with a class 2 power supply. What you cannot then do is attach to the circuit a load or control device which mandates a class 2 power supply. You cannot reclassify the devices as class 1.

Echo?

Not every class 2 or 3 circuit can be re-classified as class 1. For example if you use a power supply that is class 2 or class 3 only then you cannot use chapter 1-4 wiring methods and re-classify as Class 1.

 

[tom baker]

Even if insulated to the same voltage, the control wiring has to be functionally related to the power wiring to be in the same raceway.
One AHJ was reported to not even consider the remote start and voltage monitoring wires for a generator to be functionally related to the generator output.

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However, what type of circuit is the remote start and monitoring?
Is it an Article 725 ARTICLE 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits? If so then there are seperation rules.

 

[Lavenburg]

: ATS/Generator Control wires

: ATS/Generator Control wires

The issue is not wiring classification. The issue with running the communication lines in the same conduit with the other wires is it tends to send false signals to the controls and causing the units to fire up. This has been a problem for years even with the shield cables. Most manufactures instruct you to use two different conduits to avoid this.