2 way switching - 12V transformer

[frediaz]

Can people tell me if this is a valid way to do 2 way switching of 12V lights under a transformer, using a junction box?



Also, is it valid to do the 2 way switching on fluorescent lights in parallel like this?

 

[GaryMo]

Yes to both

 

[jj4091]

Presuming the transformer is suitably rated.

 

[RF Lighting]

and the junction box remains accessible.

 

[Lectrician]

And the cable is atleast 1mm.

 

[Lectrician]

And the breaker a 6 amp.

 

[RF Lighting]

And has new coloured cores

 

[Lectrician]

And you....

 

[tim west]

The answer is no as there are no earths going out to the transformer or florries

 

[frediaz]

The answer is no as there are no earths going out to the transformer or florries

Yes, I forgot to draw the earth wire going into the "florries" (new word to me) but the transformer does not need it does it? It does not even have a connection for earth

How accessible does a junction box have to be? like removing a bit of plasterboard to get to it? Surely we do not want it to be visible

Thanks for the feed-back in general.

 

[ricicle]

Screwed terminals need to be readily accessible for inspection as they have the possibilty of becoming loose.You would not want a loose HOT terminal hidden away for years would you?

 

[tim west]

the transformer does not need it does it? It does not even have a connection for earth
.

It's good practice to take an earth to the transformer even if it doesn't as you may need an earth for a future connection. On the diagram you could draw an earth and put N/C beside it to denote Not Connected.

 

[frediaz]

Screwed terminals need to be readily accessible for inspection as they have the possibilty of becoming loose.You would not want a loose HOT terminal hidden away for years would you?

But how can they become loose if they are properly screwed in? and there are other things with screw terminals hidden like the transformers aren't there?

 

[Space cat]

There is a difference between visible and accessible. If you can find it in the back of a cupboard it's accessible. If you can get to it by unscrewing a cover plate it's accessible. If you can get to it by unscrewing and lifting a short piece of floorboard it's accessible.

On the other hand, if you have to resort to a crowbar to get that board up I wouldn't call that accessible. Putting it behind plasterboard is even worse. How will some future house owner even know it's there?

I agree that screw terminals very rarely come loose if they've been done properly but --

1) Sometimes they aren't done as properly as we like to think.
2) Metal can creep over time.
3) Dampness can cause corrosion.

 

[plugwash]

Of course the joke is that domestic installations very rarely get properly inspected anyway