Will any led 12v DC transformer be suitable for 12v DC Extractor fan

[benhurr]

Will any led 12v DC transformer be suitable for 12v DC Extractor fan? Considering 4w rating.

 

[davesparks]

No, not necessarily. What is this extractor doing?

 

[benhurr]

No, not necessarily. What is this extractor doing?

Blowing the air out of the bathroom) is there any other purpose for it? I-Transformer will be located outside the bathroom

 

[MJPD29]

No it won't. Does your electrician not supply these materials?

 

[littlespark]

Is that 3 threads now on your bathroom?

Although we can give DIY advice, a bathroom is classed as a “special location” and there are additional regulation concerning what can and can’t be fitted.

A 12v fan should have come with a transformer… some have a run on timer built in.
An LED normally comes with a driver, not a transformer, and are classed as constant current not constant voltage.

Not all fans in bathrooms actually need to be 12v, and mains 230v can be used, even directly above a bath, but need to be designed specifically for that location.

 

[LukeD]

Blowing the air out of the bathroom) is there any other purpose for it? I-Transformer will be located outside the bathroom

Blowing air in also if its a super big high end bathroom

 

[davesparks]

Blowing the air out of the bathroom) is there any other purpose for it?

Yes there are many other purposes, based on the information you gave it could have been anything from part of a vivarium to part of an industrial process.

I-Transformer will be located outside the bathroom

That doesn't help very much.
Most SELV extract fans come as a kit which includes a transformer or power supply as required.

 

[benhurr]

Is that 3 threads now on your bathroom?

Although we can give DIY advice, a bathroom is classed as a “special location” and there are additional regulation concerning what can and can’t be fitted.

A 12v fan should have come with a transformer… some have a run on timer built in.
An LED normally comes with a driver, not a transformer, and are classed as constant current not constant voltage.

Not all fans in bathrooms actually need to be 12v, and mains 230v can be used, even directly above a bath, but need to be designed specifically for that location.

thank you, I know about special location, just want to make sure the job is done properly by low budget certified electrician. the fan is Svarna ip44 rating, 4w , it has 2 options 220V and 12v, but for 12v transformer is needed. I know that if above 2.25m the fan is fine at 220v . But just for extra safety I wanted to use 12v DC. There is now special requirments regarding transformer in the manual. Please advise a transformer if possible. I checked dedicated transformers for fans, those are all AC. Surely any transformer that gives 12v and 4w should do? But I only see the ones with plugs, not for permanent wiring. Thank you

 

[benhurr]

Yes there are many other purposes, based on the information you gave it could have been anything from part of a vivarium to part of an industrial process.



That doesn't help very much.
Most SELV extract fans come as a kit which includes a transformer or power supply as required.

this one doesn't come with (separate) transformer, it has 2 options to run at 220v or 12v. there is no transformer accessory on their website. So for 12v DC option it needs a third party transformer/power supply. The only specifics manual says
"12VDC voltage must not exceed between 10 - 13,6VDC."
Lo-Carbon Svara | Vent-Axia - https://www.vent-axia.com/range/lo-carbon-svara or Vent-Axia 100mm Svara Lo-Carbon App Controllable Extractor Fan Timer | Toolstation - https://www.toolstation.com/vent-axia-100mm-svara-lo-carbon-app-controllable-extractor-fan/p29639

 

[DPG]

thank you, I know about special location, just want to make sure the job is done properly by low budget certified electrician. the fan is Svarna ip44 rating, 4w , it has 2 options 220V and 12v, but for 12v transformer is needed. I know that if above 2.25m the fan is fine at 220v . But just for extra safety I wanted to use 12v DC. There is now special requirments regarding transformer in the manual. Please advise a transformer if possible. I checked dedicated transformers for fans, those are all AC. Surely any transformer that gives 12v and 4w should do? But I only see the ones with plugs, not for permanent wiring. Thank you

Can you not buy the matching transformer for the fan? I would go with manufacturer's recommendations rather than trying to find alternative type.

What is the model number of this fan?

 

[benhurr]

Can you not buy the matching transformer for the fan? I would go with manufacturer's recommendations rather than trying to find alternative type.

What is the model number of this fan?

this one doesn't come with (separate) transformer, it has 2 options to run at 220v or 12v. there is no transformer accessory on their website. So for 12v DC option it needs a third party transformer/power supply. The only specifics manual says
"12VDC voltage must not exceed between 10 - 13,6VDC."
Lo-Carbon Svara | Vent-Axia - https://www.vent-axia.com/range/lo-carbon-svara or Vent-Axia 100mm Svara Lo-Carbon App Controllable Extractor Fan Timer | Toolstation - https://www.toolstation.com/vent-axia-100mm-svara-lo-carbon-app-controllable-extractor-fan/p29639

 

[westward10]

A 230v fan fan be used provided it is suitable for the location. Does your low budget electrician not know this.

 

[DPG]

this one doesn't come with (separate) transformer, it has 2 options to run at 220v or 12v. there is no transformer accessory on their website. So for 12v DC option it needs a third party transformer/power supply. The only specifics manual says
"12VDC voltage must not exceed between 10 - 13,6VDC."
Lo-Carbon Svara | Vent-Axia - https://www.vent-axia.com/range/lo-carbon-svara or Vent-Axia 100mm Svara Lo-Carbon App Controllable Extractor Fan Timer | Toolstation - https://www.toolstation.com/vent-axia-100mm-svara-lo-carbon-app-controllable-extractor-fan/p29639

It looks like any regulated 12V DC power supply can be used providing it can provide 4 Watts and is suited to running with such a low loading.

But as above, it is also suitable when fed with 230V

And avoid cheap contractors - there is usually a reason they are cheap!

 

[benhurr]

A 230v fan fan be used provided it is suitable for the location. Does your low budget electrician not know this.

sure, but can we have 12v for extra safety of is it unreasonable to ask? Everybody knows above bath tub at 2.25m (zone 2) it is ok to have 220v with IP44, But still 12v is safer

 

[benhurr]

It looks like any regulated 12V DC power supply can be used providing it can provide 4 Watts and is suited to running with such a low loading.

But as above, it is also suitable when fed with 230V

And avoid cheap contractors - there is usually a reason they are cheap!

I wouldn't be here if I could afford those

 

[DPG]

sure, but can we have 12v for extra safety of is it unreasonable to ask? Everybody knows above bath tub at 2.25m (zone 2) it is ok to have 220v with IP44, But still 12v is safer

Yes no problem at all. At least you are weighing up the options.

 

[westward10]

If it is correctly installed the voltage is not relevant.

 

[benhurr]

Looks like everybody is voting for 220v and giving up on advising 12v DC transformer because it is not common and not showing up in google I wonder what were the manufacturer thinking by adding 12v DC options since there is no suitable PS on the market. I will email them just out of curiosity.

 

[DPG]

Looks like everybody is voting for 220v and giving up on advising 12v DC transformer because it is not common and not showing up in google I wonder what were the manufacturer thinking by adding 12v DC options since there is no suitable PS on the market. I will email them just out of curiosity.

I advised about a power supply in post #13

 

[davesparks]

But still 12v is safer

Correctly installed 230V by a reputable electrician can be safer than poorly installed 12V by a budget contractor.

Being 12V doesn't automatically make it safer, you need the correct type of power supply meeting the right safety standards.

 

[davesparks]

Looks like everybody is voting for 220v and giving up on advising 12v DC transformer because it is not common and not showing up in google I wonder what were the manufacturer thinking by adding 12v DC options since there is no suitable PS on the market. I will email them just out of curiosity.

Nobody is recommending specific power supplies because we don't know enough about the installation.

There are plenty of suitable power supplies on the market but unless I'm doing the job and have actually seen where it is going to be installed and worked out what is needed I can't advise on specific power supplies.
Plus most suitable power supplies are going to be of a type which is designed, and required, to be installed in a seperate enclosure, we can't recommend something like that without knowing that it is definately going to be installed safely.

 

[benhurr]

Nobody is recommending specific power supplies because we don't know enough about the installation.

There are plenty of suitable power supplies on the market but unless I'm doing the job and have actually seen where it is going to be installed and worked out what is needed I can't advise on specific power supplies.
Plus most suitable power supplies are going to be of a type which is designed, and required, to be installed in a seperate enclosure, we can't recommend something like that without knowing that it is definately going to be installed safely.

it is in a wall at 2.70m above bathtub , the specs of the fan are known. what else do you need to know? ). All walls are accessible on every side. You are cosplaying a rocket scientist now Anyways, the guy from the Vent-axia replied surprisingly quickly and advised this Vent Axia 444102 230/12V Svara Transformer - https://www.extractorfanworld.co.uk/vent-axia-23012v-svara-transformer-5390-p.asp which is quite pricy for the purpose. which cost £83.54 delivered. Almost as shocking as electrocution. So the matter is kinda solved unless you can see cheaper options. It is going to be installed by certified electrician, just some of those might need extra guidance, that is why some of them are here as well.
!!! Update found ex-demo on eBay under £30 ,tested and working !!!
(found similar thread here Vent Axia Svara Extractor Fan Transformer help - https://community.NoLinkingToThis/threads/vent-axia-svara-extractor-fan-transformer-help.253727/page-3)

 

[DPG]

Wow that's an expensive transformer!

 

[westward10]

If your electrician needs extra guidance I suggest you find another electrician.

 

[benhurr]

If your electrician needs extra guidance I suggest you find another electrician.

I have not met him yet, quite a few guys promised to come and see but no response since Monday. The collective knowledge is most of the time greater the the individual one, to some degree any electrician can benefit from it. And on top of that some of the regulations are fairly ambiguous so it would be good to know consensus on certain things before witnessing the procedures.

 

[westward10]

Do you have a copy of the Regulations.

 

[davesparks]

And on top of that some of the regulations are fairly ambiguous

Which regulations do you think are ambiguous?

Generally the regulations aren't ambiguous at all, it's people's inability to read them properly that causes a lot of that.

The other big issue is people not keeping up to date with the changes to the regulations, especially with regulations which are removed.

 

[benhurr]

Do you have a copy of the Regulations.

sure thing: IET - BS 7671 On-site Guide (2018), IET - BS 7671 2018 (2018), IET Wiring Regulations (17th Edition BS 7671_2008) Amendment 1_2011

 

[DPG]

sure thing: IET - BS 7671 On-site Guide (2018), IET - BS 7671 2018 (2018), IET Wiring Regulations (17th Edition BS 7671_2008) Amendment 1_2011

Bear in mind we are on the 2nd amendment of the 18th edition now, so some things have changed.

 

[benhurr]

Which regulations do you think are ambiguous?

Generally the regulations aren't ambiguous at all, it's people's inability to read them properly that causes a lot of that.

The other big issue is people not keeping up to date with the changes to the regulations, especially with regulations which are removed.

well this way you can easily hit the wall with "properly" , all of them will assume their way of reading is "proper". And then they will give contradicting advice on forum Just let it go

 

[benhurr]

Bear in mind we are on the 2nd amendment of the 18th edition now, so some things have changed.

2nd amendment: no more stickers on CU)) I have Requirements for Electrical Installations, IET Wiring Regulations, Eighteenth Edition, BS 7671:2018 as well