What is a Volt-Free Contact? | Electricians Q&A

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Volt free, potential free or dry contacts are commonly found on electronic equipment. In this video, we explain what a volt free contact is, how they operate and why you'd use them.
This electricians' Q&A was raised in response to our recent review of the Ferret Wireless switch from RF solutions. 📺 👉 • RF Solutions Ferret - ...
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🕐 TIME STAMPS 🕕
00:00 What are volt free contacts
00:42 Loads of electronics
01:35 No volt contact
01:58 Common
02:31 Normally open and normally closed
03:42 Line and switching line
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Опубликовано:

30 июн 2024

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Комментарии : 39

@efixx 2 года назад

Check out the RF Solutions Ferret with volt free contacts ✅ 👉 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ynH46_HPRR8.html

@thattoolguy9432 2 года назад

Volt free contacts have been used in PLC and fire alarms for years, it's only recently hit the domestic market, mvhr's and heating controls seem to be becoming this way.. isolated supply is another term... good explanation Joe

@richardpugh8702 2 года назад

Great explanation, I'm currently using a 4Ch Sonoff controller in conjunction with an RF Door Access system I've installed for our garden gate. It enables me to interrupt the Push to Open and/or Maglock circuit in conjunction with smart routines to enable or disable use of the gate at certain times or on certain days and it works really well

@seanthespark 2 года назад

Great explanation Joe 👍, we mostly use them in automation functions and time functions, the din rail mounted timers from the likes of greenbrook work in the same way, we use them for timed opening of site gates etc, normally with a gsm or rf/wifi receiver in parallel for out of hours access.

@mastergx1 2 года назад

I've been asked that question before "what is a volt-free contact". My answer has not changed - "its the arse end of a relay"!

@efixx 2 года назад

😂

@puntoboy_gt 2 года назад

I used to use a volt-free Shelly 1 smart relay to control my garage door opener via my smart home and phone. It was a really old opener and therefore only had a standard RF remote. The Shelly has Wi-Fi so connected to my home network and can be controlled from anywhere. I powered the Shelly with a 12v adapter and used the volt-free relay to connect the push button terminals on the door opener.

@irfanrajput8236 3 месяца назад

I have been using volt-free/potential-free/dry-contact in my circuits, since 2015. However, I have been using the term ISOLATED for this.

@eliey4677 Год назад

Great vid. Thanks from down under

@brianwood5220 2 года назад

Well explained Joe 😁

@micolislongis5558 Год назад

You're a great teacher.

@efixx Год назад

I appreciate that! 👍🏻

@scwfan08 2 года назад

I mostly use them in ripple control receivers for photovoltaic installations

@JasGawera 2 года назад

Have volt free on my UFH control, it is on a separate electric circuit to the boiler, so has a volt free contact to switch the boiler signal on when demand for heat is there. So no connection across circuits. I wonder if it should have a sticker indicating multiple circuits should be isolated before opening. Or maybe it is no different to the 2 gang switch at the bottom of my stairs. Thanks Joe

@chetanpatil8127 20 дней назад

If relay we are using has control supply is dc and can we use Volt free contact in AC circut in remote for control?

@christopherhume8896 2 года назад

Sounds fun but I'm assuming it can't be fitted into an existing installation. Really need one that can take 230V but that means a transformer inside the back box.

@efixx 2 года назад

They do make a small PSU that could fit in a deep back box, check the full video out: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ynH46_HPRR8.html

@clivecoleman9543 Год назад

How do i wire two ceramic panels controled by a volt free thermostat.?

@alunroberts1439 2 года назад

So we're dose it get the power to close the relay and the control pcb.

@rob3125 2 года назад

Her in Denmark we call them potential free contacts.

@efixx 2 года назад

Good to know. 😊

@michaelgabriel1566 2 года назад

Same in Germany. Potenzialfreier Kontakt.

@justme5384 2 года назад

Finland too

@DofTF Месяц назад

Nothing new here I was using devices like this back in the last 70s to control floodlights linked to alarm systems

@raychambers3646 2 года назад

Theres a volt free contact on Danfoss roomstat. How do you separate hi / low volts in back box?

@efixx 2 года назад

Just make sure the lower voltage conductor has insulation rated at the higher voltage. 👍

@raychambers3646 2 года назад

@@efixx that's what I have done in the past ,also seen a paxolin separator used ,

@engineerrehman6821 3 месяца назад

So dry contact are voltage free contact

@Dog-whisperer7494 2 года назад

Interesting. So another pain in the bum when it comes to doing an IR test ? So we will have to waste time taking that thing out of circuit in order to carry out the tests? Brilliant idea,not but who am I to argue i’am just a Humble spark who’s opinion means nothing. Great video as always Joe 👍

@pn8902 2 года назад

Why do you need to take it out, its like any old light switch, just operated by a remote lol

@Dog-whisperer7494 2 года назад

@@pn8902 because an IR test could damage the electronic circuit board.

@pn8902 2 года назад

@@Dog-whisperer7494 right, but the relay’s outputs are galvanically isolated from the rest of the circuit (trust me I’m an electronic engineer), its just two contacts like a 2 way switch. However it depends on the type and quality of relay used. Besides, what if it was a regular dimmer switch, you’d have to remove it anyway so is it really a big deal.

@Dog-whisperer7494 2 года назад

@@pn8902 I get your point but BS7671 says electronic equipment must be removed from circuit before doing IR test

@deang5622 Год назад

@@Dog-whisperer7494 You need to think practically. Which IR are you measuring? The power to the device is DC at low voltage and you need to have a power supply to feed it. You're going to be testing the IR of the cable connected to the output. There is no reason why you can't apply the high test voltage with the cable connected to the relay. If the relay has been spec'd correctly it will handle it. You can research the type of relay online from its manufacturer and part number and make a determination as to whether it can handle the voltages in an IR. Or you can try it out. You don't have to blindly follow BS7671: it cannot cater for every single type of electrical apparatus that could be connected in an electrical installation.

@miketucker7466 2 года назад

It’s shows the sad state of electrical apprenticeship training that this sort of thing has to be explained! Or is that just from the training providers I see?

@Dog-whisperer7494 2 года назад

Hear we go again . I get in trouble because of someone else’s ignorant disrespect for my dislexic