fan perm live

[orbital]

only switched live and neutral in the ceiling.

So was thinking of doing this.

Fan to come on with its own separate switch out side the loo

Take perm live from light switch to a 3amp FCU.

Perm live from FCU to switch for fan.

So I will now have a perm live at the switch, and a switched live (other side of switch)

So both live and switch live are fused down to 3 amps

Then take this live and a switch live to extractor fan (Via isolator)

Neutral will come from the light in the loo. (Via isolator)

That OK? just go a feeling I've missed something. Its the taking the live and switch live from the same switch that is making me unsure

Thanks

 

[sparkytim]

Sounds ok, problem would be if only ONE of them was from fuse.

 

[ProDave]

IF you are going to put an FCU in (presumably because the fan manufacturer tells you to fuse it at 3A) then feed the bathroom light via the FCU as well so you have both live and switched live from the FCU.

In the real world, just connect the fan without an FCU from the L and SWL of the lighting circuit. There must be hundreds of thousands wired like that and they don't self destruct because the "only" OCPD is the 6A lighting MCB.

Don't forget a 3 pole fan isolator near the fan.

 

[betty swollocks]

Sounds good

Although no need to use a fused spur as there is no need to downrate 6a supply,

a normal light switch will do because you are using an isolator to disconnect the live, sw live, & neutral supply to the fan

 

[Doc Hudson]

Sounds good Although no need to use a fused spur as there is no need to downrate 6a supply,

a normal light switch will do because you are using an isolator to disconnect the live, sw live, & neutral supply to the fan

A lot of fan manufactures instruction do say connect via a 3A fuse.

Doc H.

 

[Steve3948]

A lot of fan manufactures instruction do say connect via a 3A fuse.Doc H.

And I think they do that, so when it does self destruct they can use that in their defence.

Its the same with the "Should be installed by qualified Electrician"

TBF you don't see many with 3A fusing on your travels unless it's on a circuit other than 6A.

 

[shed69]

It says Heinz Baked Beans on the side of buses but you cant buy em in there!!!

 

[SPECIAL LOCATION]

Interesting......

how when its a cowboy ignoring regs or manufactures instructions they are considered a plonker.....

and a danger to the trade.....

Yet as a when the whim takes you, it is thought of as proper to ignore the manufactures instructions..

If ever I see instructions saying connect via a 3a fused spur..

I stick one on....

whats it cost

 

[shed69]

Special, maybe it's one of the things you may weigh up and think "hang on a minute do I really really need to do that even though it says in the manufacturers" a little like the bonding of pipes at a boiler with a dual rcd board in place....

No need but it says so in the manufacturers.... I personally don't and until someone comes up with a good explanation as to why i need to then I can't see why I need to....?

To side step a little, I've had manufacturers instructions telling me to have a 16th edition electrician install !!! This year even......!!!

---------- Post Auto-Merged at 19:01 ---------- Previous post was made at 18:59 ----------

Tell you what, tomorrow I'll ring Vent Axia and ask why and report back on post.....

Bet they don't have an answer.....

 

[Steve3948]

Ditto and just because a manufacturer recommends you fit one, don't mean you have to and in 41 years I've only seen one and that was because it was spur off a ring main.

They only recommend, it's not mandatory and has been discussed many times, most don't even want an isolation switch let alone a fused connection unit .....just sayin.......

 

[tom1]

have a look at grid switches might make job easier

can you get a neutral to the light switch?

 

[kme]

Well.....d`you know?

I was about to multi-quote a couple of posts on here, and put my opinions interjected in there - then thought "why waste the time"?

If people have made it perfectly clear that manufacturer`s instructions are only applicable if they themselves can understand the rationale; then any comments lowly me would have to add would be water off a ducks` back.

Question: If you approach a "pelican" type crossing; and the lights are red, but you can`t see anyone on the crossing.........do you decide that the red light doesn`t apply to you, because, in your opinion it isn`t necessary? I expect the answer is "yes".

Now, personally, I think you`re wrong. But that is the beauty of humans - we have different values. Me - I can see the point you`re putting - maybe it isn`t necessary. But it has been requested, by the person who made the item in the first place.

But I`m reaching the point where I don`t care anymore. If someone "does it there way, `cos it doesn`t make a difference", then I reserve the right to envisage you on horseback, riding away. YOU may not consider yourself a cowboy - I expect most cowboys don`t consider themselves cowboys either......

I`ll carry on fulfilling "pointless" (in your opinion) regs (do you just ignore the ones in there you don`t "get" too? ) because I believe that the manufacturers might just know more about their product than I do.

KME

 

[steptoe]

do we still cross bond boilers?

most boiler instructions still ask for it, according to my gas-man mate anyway, so why dont we do that still?

do we torque all our CU terminals up with a calibrated torque instrument? I dont, but most manuf state that we should.

we could pick holes in virtually everything, maybe common sense isnt required anymore,

lets all be sheep, ?

nah,

I'd rather be a unique individual, just like everyone else.!

 

[batty]

Not sure I would agree with that KME the xpelair fan I fitted at the job we did won't switch off. Now I have spoken to xpelair and have had conflicting advice. The last numpty I spoke too tells me I need to switch the neutral. So how is the over run going to work if it doesn't have a neutral. At the minute I have replaced it with a manrose fan that works fine. I will get to the bottom of it even if it kills me.

 

[steptoe]

batty, I suspect you have mixed up terminals/polarity somewhere,

if not then you have a faulty fan.

 

[batty]

I have replaced the fan with another this is also doing the same thing just running on. The terminals are T, L1,L2 and neutral L1 is low speed and L2 is high speed T is switched live. The guy I spoke to said you have too switch the neutral to me this is not right I did try it but it still won't do what it should. I have never had a problem like this before it really has got me baffled.

 

[steptoe]

logic would say T is perm live, and L1 and L2 are trickle and switched line.

ie, T is for timed over-run at high speed, L1 is perm line for slow running trickle, and L2 would be high speed switched line.

looks like you need 2 x switched lines.

---------- Post Auto-Merged at 01:18 ---------- Previous post was made at 01:16 ----------

have you got a spec/link to the [faulty?] fan you have fitted?

 

[Steve3948]

Most of these fans are not even made in this country and are sold to many parts of the world, the clue is the instruction leaflets which are in multi languages. Not all countries fuse lighting at 6A so Vortice Fans tell me that's why they include recommend fuse at 3A.

In the Uk you fit a 28W High Frequency Bulkhead, look inside you have printed circuit board and wiring very much like the fan, do you fit a FCU on these, a Low Voltage Downlight Transformer do we fit FCU to them, why not, because it does not say in the box.

If it said in the box after fitting I want you to go outside stand in front of oncoming traffic - would you !!!

How many of you have 2 tread steps and now refuse to use them because they have no hand rail, I bet there are some.

It's been ok to use 2 tread steps for 2000 years, but then in this PC world you are told it's not safe, but that's another story.....just sayin....

 

[ProDave]

How many of you have 2 tread steps and now refuse to use them because they have no hand rail, I bet there are some.

It's been ok to use 2 tread steps for 2000 years, but then in this PC world you are told it's not safe, but that's another story.....just sayin....

The ones that get me are the 5 tread (or more) steps, where the top tread is made of plastic, moulded exactly the same as the other treads with the same non slip pattern, but then in tiny letters "do not stand on this step" (because it's plastic and it will break) FFS if they don't want you to stand on it, why make it look like a tread?

 

[betty swollocks]

How many of you have 2 tread steps and now refuse to use them because they have no hand rail, I bet there are some.

It's been ok to use 2 tread steps for 2000 years, but then in this PC world you are told it's not safe, but that's another story.....just sayin....

The ones that get me are the 5 tread (or more) steps, where the top tread is made of plastic, moulded exactly the same as the other treads with the same non slip pattern, but then in tiny letters "do not stand on this step" (because it's plastic and it will break) FFS if they don't want you to stand on it, why make it look like a tread?

If it wasn't for the plastic top step I'd never get in the loft to wire the damn fan up anyway! 3A fuse or not