Can I take a 24v transformer, hook up the 110/120 and use the 24v side to test 24v products? I'd like to ground or offer some type of fall safe such as a inline fuse to help protect the transformer. Any ideas please. Thank you.
Electrical – 24v transformer supply
electrical
Related Solutions
The output appears to be ungrounded or center grounded. It could be a transformer intended for outdoor tools in UK. If there is also a safety ground 3 wire plug, it could be coupling some of the harmonic current from the switch mode active power supply (which should be flowing equally on hot and neutral) on the safety ground. That would be unbalanced current and trip the GFCI. The smaller transformer could be wired with normal grounding or it may have a plastic case. Adding filtering to the mains input could fix the GFCI issue.
The terminal circled in red should be labeled HUM-H, which is the humidifier (hot) terminal. This terminal is energized to 120 V when the system is running in heating mode.
The terminal circled in blue is EAC-N, which is the electronic air cleaner neutral. This terminal should be tied to the other neutral terminals, as well as the system neutral.
If you move the humidifier transformer wire from HUM-H to EAC-H, the humidifier will run whenever the fan is on. However, this also includes when the system is in cooling mode, which is not recommend.
What you could do, is install an override switch, which will allow you to manually turn off the humidifier during the cooling season. So you'd run a wire from the EAC-H terminal, to one side of the switch. Then connect the humidifier transformer wire, to the other side of the switch. This way when the switch is closed, the humidifier will run with the fan. But when the switch is open, the humidifier will not run.
If you don't want a manual switch, you could mess around with a relay or other control circuitry.
Using a relay, it could be wire up like this.
That way the humidifier will run whenever the fan is running, except when the thermostat is calling for cool.
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Best Answer
Yes, you can use a common 24V 40VA transformer that mounts on a junction box lid. If you have a handy junction box location already built into your building, You can simply mount it there. Or you can add one to your building using legal wiring methods.
I am not beneath getting a 3-prong line cord (often a 3-prong extension cable with the socket lopped off), and stopping by the local electrical supply house with the line cord in hand to acquire a proper strain relief for that cord and a nice stout aluminum junction box while I'm there. Also a 10-32 ground screw. I'd bring the transformer too for fitment, and that isn't rude since they typically don't sell transformers. Then, mount and strain relief the extension cord, ground it to the box, and hot and neutral to the transformer 120V side. The 24V terminals should be on the outside of the transformer.