12v Semi Flush Light Problem

E

evanswillo

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• 11 Jan 2004

• #1

Trying to install a new light fitting upstairs.
Removed old fitting, and installed new fitting.
Ceiling rose contains the following wires

4 red wires
3 black wire
1 black/red
4 green/yellow

All black wire connected together and to the new light. Neutral
One Black/red wire connected to the new light. LIVE
All green/yellow connected together.
All 4 red wires connected together

New unit is 12volt with a Toroidal transformer with 8 small 12v 20w bulbs.
When first connected the 2.5a fuse within the fitting blew immed the lights were switched on.

Reconnect normal two wire bulb to the two input wires this worked fine.

So why is the fuse blowing ?

 

B

breezer

• 11 Jan 2004

• #2

which side is the fuse on?

try putting a plug on the transfromer with no lights see what happens, if it blows transformer is "not very well"

 

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evanswillo

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• 11 Jan 2004

• #3

Thanks for the quick response.
The unit is all self contained.

 

B

breezer

• 11 Jan 2004

• #4

so what happens if you power it up with no lights

 

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evanswillo

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• 11 Jan 2004

• #5

Ok
I reconnected everything and removed the bulbs.
Switched on and off removed and tested fuse. The fuse was still working.
Put one of the eight bulbs in, replaced the fuse.
Switched on great its working.
Switched off and back on now no light checked fuse the fuse has now blown.
So the light unit does work, but something is causing the fuse to blow.

 

B

breezer

• 11 Jan 2004

• #6

looks like fuse is on secondary side, since it will run one lamp (1.6 A) but not two (3.2 A)

Basically the fuse is too small, thing is though if it is not on the secondary side you are in trouble, where did the light come from?

 

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evanswillo

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• 11 Jan 2004

• #7

Sorry I seem to be confusing things.
I have connected the light unit as before and inserted one of eight bulbs into the light. It worked once only. Switching the light off and back blew the fuse.

 

B

breezer

• 11 Jan 2004

• #8

so where did you get the light from?

 

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evanswillo

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• 11 Jan 2004

• #9

It was one of eight small bulbs of the celing light itself.

 

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evanswillo

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• 11 Jan 2004

• #10

this is the light I,m trying to fit

 

B

breezer

• 11 Jan 2004

• #11

no, i meant the light fitting where did you get it, was it brand new?

 

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evanswillo

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• 11 Jan 2004

• #12

Yes new out of the box.

Thanks for your help on this.

 

B

breezer

• 11 Jan 2004

• #13

take it back, explain what happens, ask for another one.

you have also read the instructions?

 

B

BR

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• 11 Jan 2004

• #14

I saw this before, brought unit back, got another one, no problems. Pricy light!

 

B

breezer

• 11 Jan 2004

• #15

BR are you saying you had one too?

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you could make similar cheaper than that, transformer, few bits of t & e lamps hey presto