Are doorbell wiring and/or fireplace ignitor switch wiring considered class 1 circuits as defined in 725? If not, what part of the code applies to these installations?

I don't know about the fireplace ignitor, but all of the doorbell transformers that I have seen are NEC Class 2 power supplies.
Don

don : there are a tricky part of fireplace ingitor it can be classifed as class 1 or 2 depend on what type of ingitor i know my furance have class 1 i just replace the ingitor not too long ago it have 120 volts power to ingiter to glow it hot to light off the gas but instering part is that when the power switched off at ingitor then it go to ohm meter reading mode or restive mode to read the heat from flame so it is instering part of the wiring system but i will admit i got off the track little too far but yes you are right the door bell system are class 2 system but i try to recall the voltage limit i belive it is 48 vac or 60 vdc low load type .... maybe i am reading this wrong but if i am mistaken do please correct me on this one we all still learn something new all the time


merci marc

I have been confused by Class I & II classifications at times. If you purchase a specific device from a vendor will it usually state on the device or in the specs. that it is a Class II circuit? If not, what is the easiest way to determine that it is Class II circuit?

The code does not specify a maximum voltage for Class 2 and 3 circuits. It is all based on the listing of the circuit power supply. If the power supply is a listed Class 2 or 3 power supply, then the circuit is also Class 2 or 3. If the power supply is not a listed Class 2 or 3 power supply the circuit is either a Class 1 circuit or a power circuit.
Don

Thank you Don I appreciate it.