I am in Australia and I wish to wire in an exhaust fan to my fluro light operated by the one switch.

The switch has a red wire and a white wire leading to the fluro light. The fluro has twin and earth (red, black and green) leading from a previous light in another room and another exiting to the next light in the house. The fan has two wires, a brown and a blue. I attempted to parallel the wiring by connecting the blue to red and brown to white. Once the fuse was turned on, the fan operated automatically and the light flickered without the switch being turned on. I reversed the wiring (brown to red and blue to white) with the same result. Logic failed me. Given that it is two wires on the fan (pos and neg I assume) I figure I am better parelleling to one of the twin and earths, but which one? Electricians charge a minimum of $240 per hour here, with a minimum of 1 hour charge, regardless of it being a 2 minute job. All connections are 240V. Wire joins will be completed using BP connectors.

Picture of I am in Australia and I wish to wire in an exhaust fan to my fluro light operated by the one switch.
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caarntedd6 years ago
Put the brown from the fan into the terminal on the flouro light that has the white swich wire in it. Put the blue from the fan into the terminal on the flouro light that has the black wires from the twin and earth in it.

Or cut and join the wires as described if that is how you wish to do it. Fan brown to switch white, fan blue to twin and earth black.

This will work assuming that all your wiring was previously done correctly. If it doesn't, then PM me or reply to this, and I will work it out.

I am also in Australia and worked as a sparky before I became a Firefighter.

This is not quite up to code, but it is safe and will work. If you want to know the right way, let me know.
weekendDIYer (author)  caarntedd6 years ago
Sounds good. The cord on the fan is only 3 feet long. The gap to the fluro is about 4 feet. This is why I attempted to wire it into the loop. The fan did have a plug on it, but I cut it off in order to hard wire it. (as you stated below). I have a 12 volt regulator in the loo and wired one directly into the loop without a problem. The house is only 4 years old if that helps. Your plan (above) will work if I make the cale from the fan longer. i will have a look to see if his can be done easily. Normally 240V scares the crap outta me (I drive tanks for a living) but I am getting better with it as time goes by.
For UK code, it would be illegal, unless the fan has a separate fuse. Same in Oz ?

No. The illegality comes from the colour and type of wiring. Blue/brown flexible cord from the fan should not be directly connected to the fixed wiring. The right way would be to hard wire a surface mount lighting socket (a small round power outlet the same configuration as our normal wall outlets minus the switch) to the switched (white) active wire and the neutral (black) wires, and attach an appliance plug to the fan wiring and plug it in. The socket switches on and off with the light and is protected by the same fuse. A very handy place to plug in a work light or power tool while working in the ceiling space. Also makes for easy fan replacement by the homeowner.
That's why we fuse, but we have ALSO recently changed wiring colours for twin+E to Brown and blue from red/black. You can't plug loads into a lighting circuit here.

If it fits, you can plug it over here. Stuff that draws a higher current has a different plug and won't fit into a standard 10A rated socket. Worst case scenario, you blow a fuse/trip a breaker.

Besides the colour difference, the fan wiring is most likely at least a 50 strand flexible type of conductor, and the fixed wiring of the house would most likely be 7 stranded. It may also be a single solid conductor, or depending on age, could have 3 strands per conductor. Not really compatible for twisting together, especially for the inexperienced.
Also if the fan has a green (earth) wire just connect it to the other earths (green/yellow).
Kiteman6 years ago
My instinct would be to wire the fan into a break in one of the wires to the switch.

That would put the fan and light in series, but you can be certain that the circuit is broken when the switch is operated.
weekendDIYer (author)  Kiteman6 years ago
Tried that. The circuit was made and maintained with the switch operated.
Brown to white, blue to black.
weekendDIYer (author)  caarntedd6 years ago
Caarntedd, you legend. Easier than I thought. Thank you very much. Even looks very professionally completed. Cheers.
If Aussie wiring is like ours, you may have a lighting ringmain, and you have a feed to every light, and a drop down to the switch. You need to take a really close look at the terminals in the light and post a picture here - your colour conventions are different from UK.

NachoMahma6 years ago
.  Put the fan in parallel with the light. AC doesn't have polarity, so you can't hook it up backwards.