Questions tagged [relay]

A relay is a control device that allows a small voltage or current to control a larger voltage or current. Use this tag for questions about standalone relays in electrical or HVAC wiring -- questions about relays in appliances do not need this tag.

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Box mounting point

What are the chances of this setup passing an inspection? 4x4 box is mounted on a stud, relay attached to the bottom 1/2 knockout, transformer will be mounted at the front of the box. This is in ...
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60 views

What circuit components should I use for a vacuum?

So I'm constructing a dust extractor system for my workshop, and I need to figure out a circuit. I have 3D Printed a connector that connects two PVC Pipes, and has a hole for a wooden slab. I can ...
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78 views

Should I use an Isolation Relay between a Furnace and Humidifier?

I recently installed a new Aprilaire 700 humidifier attached to a Carrier Infinity 96 furnace. It has been working perfectly for the past 3 days. Considering the fact that there are 2 distinct ...
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28 views

How to get Condensate Pump to talk to Sonoff 4CH Pro R2

I currently have a WiFi water alarm triggering a Sonoff 4CH Pro R2 to kill my whole house humidifier. So I have some experience with triggering the relays and getting the two devices talking to each ...
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25 views

Strange lamp behaviour

I have an exterior lamp that is controlled by a standard switch and a 'timed-relay' (I push a button and light stays on for 3 minutes), I think those two are wired in parallel as if the lamp is on and ...
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33 views

would these be compatible replacement solid state AC Relays?

I am replacing a relay for an appliance (stove). I cannot find a replacement relay, however I thought I'd confirm if the following relays would be compatible: 1) input 90-250 VAC output 24-440VAC 25 ...
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2k views

How to connect Nest thermostat to Evaporative Cooler (Swamp Cooler)

I have reviewed the post here, Controlling 110v swamp cooler using Nest thermostat It discusses how to connect an evaporative cooler using 110v to a standard thermostat. I am looking for a specific ...