My new light keeps blowing a fuse

I want to have light in my shed. I have a waterproof double socket in the garden feeding off the main ring circuit which i use for the pond pump etc. I connected a 3 core cable to this double socket and into a one way waterproof switch from which I wired up a ceiling rose in the shed. I was able to switch this new light on in the shed but then when it was turned off and turned back on it tripped the fuse on the consumer box. If I reset the consumer box, the light will switch on again, but once turned off and then on again, continues to trip the fuse.

Can someone please tell me what I have done wrong and how, if at all possible, I can put correct it.

I'd be really grateful if you could tell me in basic, layman terms please.

Thanks, Fiona

How did you wire the switch and the rose - i.e. which connections in the socket -> switch -> rose went where with the 3-core cable?

SW fuse spur used (not a switch) i hope.

I reckon you have the switch upside down for a start, and that you have put both reds in one switch terminal, and both the blacks in another??

from the double socket i used 2.5mm twin core and earth cable. I took this to the 1-way switch. I wired the red into L1 and the black into comm. I wired 1.5mm 3core flex as follows: the brown into L1 and the blue into comm, and earthed it. The live and neutral wires fitted into the appropriate terminals in the rose.

lectrician thats exactly what she's done

put the red into one of the switch terminals and the brown into the other take a connector block and connect the blue to the brown

chappers said:

put the red into one of the switch terminals and the brown into the other take a connector block and connect the blue to the brown

Click to expand...

Hopefully before you do that, Fiona, you'll read this correction:

DO NOT USE A LIGHT SWITCH.

Use a switched fused connection unit (FCU), Put the black and red wires from the socket into the supply terminals, and the blue and brown wires from the light into the load side. Put a 3A fuse in the FCU.

But before you do that, I'd like you to stop and think for a minute.

What you did with that switch shows such a huge lack of understanding of the most basic ideas that you really should not be working on your electrics, especially outside.

thanks for that. I was going to do it now but probably should wait for daylight as the sensor light in the next door garden only stays on for a few seconds and the batteries in my head torch are getting a bit low on power!!!!

Seriously though, I really appreciate your help and your honesty. Thanks very much for the advice. I will let you know how I get on.