Is it possible to enclosure in the same box IGNITION AND SIGNAL???? 1

[Saver2008]

Dear Sirs!

I know that when you have an electrical enclosure (hoffmann, adalet, etc) you can not put in the same box an ignition device and a signal device together. My target application is the following:
-I want to put an ignition transformer and a flame relay in the same box (not each box for each equipment). I want to know if exists a code, norm or other regulation that says to me not to do that.

Thank you very much for your help.

Roland

 

[WoodrowJWeen]

It's done all the time in commercial HVAC equipment. Was just looking inside the control box for a gas unit heater the other day. Ignition transformer & all control electronics in same metal box.

 

[Saver2008]

DEAR WOODROWJWEEN,

YOU ARE RIGHT! I HAVE FOUND THAT TOO BUT IS THERE A CODE OR A STANDARD WHERE IT SAYS THAT IT IS NOT POSSIBLE TO PUT IN THE SAME ENCLOSURE A SIGNAL DEVICE (FLAME AMPLIFIER) AND THE IGNITION DEVICE (IGNITION TRANSFORMER).

THANKS FOR ANSWERING!

ROLAND

 

[IRstuff]

Please refrain from all caps

TTFN
faq731-376

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[DRWeig]

I am unaware of any such code or regulation.

There's a furnace in our office building that has everything in one box. UL listed. I can think of no reason not to.


Best to you,

Goober Dave

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[racookpe1978]

The interference issue (between small signal wires and small signal and control voltages, and the typically larger power signals) is real, and is avoided in good design practice and by the field by using difference cableways - physically separating the two kinds of wires when they would otherwise be twisted around each other randomly over long runs.

Properly separated and in "one box" for a single function, there is no other way to do the job. A ignition source though, is a rapid "spurt" of noise that you may see at either stop or start in your signal and control readings.

 

[hacksaw]

Industrial settings using HV ignitors require that they be separate from monitoring equipment.

Apart from common practice on wiring/device segregation, I recall that the local fire protection codes are involved, relating to potential combustible sources and the electrical enclosures.

If you are referring to a prefabricated assembly then testing agencies maybe involved to establish it's electrical classification and safety