Lighting circuit

[DPG]

I was changing the light.

Sounds like you assumed the switched live was a neutral and connected it to the neutral of the supply. Which would definitely trip the MCB!

 

[timhoward]

Don't know if this helps the OP at all. Note the highlighted switch wire joins the middle live terminal to the light. It should be marked with brown sleeving/tape (or red if old colours). Many out there aren't marked and you have to learn to work out which one it is.

 

[Iona222]

Sounds like you assumed the switched live was a neutral and connected it to the neutral of the supply. Which would definitely trip the MCB!

exactly, i think your right bud, should I have put this in with the lives? Its wasn't a rosie it was led light.

 

[Iona222]

Sounds like you assumed the switched live was a neutral and connected it to the neutral of the supply. Which wou

 

[DPG]

exactly, i think your right bud, should I have put this in with the lives? Its wasn't a rosie it was led light.

Makes no difference, rose or light fitting. A switched live cannot connect to a neutral.

See the diagram someone posted above for how lighting circuits are wired. This will answer your question of where the switched live goes.