Transformerless AC Mains circuits.

Thread Starter

Reloadron

Joined Jan 15, 2015
5,506
My understanding was that transformerless non isolated AC mains circuits were a major no-no. Yet when I look at this thread with a focus on post #30 there was apparently a rule change I am not aware of why this circuit is OK? Maybe I am just missing something?

Ron
 

Irving

Joined Jan 30, 2016
797
And they still are, unless the circuit in question is fully self-contained and has no external connections - as does that thread and its predecessor.. They are power for an embedded & sealed IoT device . Most mains powered plug-in wireless door bell sounders are similar, for example.
 

ericgibbs

Joined Jan 29, 2010
10,195
hi Ron,
The T&C were updated a while ago.
Eric
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Thread Starter

Reloadron

Joined Jan 15, 2015
5,506
And they still are, unless the circuit in question is fully self-contained and has no external connections - as does that thread and its predecessor.. They are power for an embedded & sealed IoT device . Most mains powered plug-in wireless door bell sounders are similar, for example.
The circuit in question is measuring 120 VAC 60 Hz AC mains power. It's not where the voltage being monitored is going but where it is coming from, originates.

Ron
 
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