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[royston10_0]

ive run a spur off a toilet light into my shed next door to the toilet i ran a live wire through to shed and came out off the live back to a switch as per the light in the toilet switched the power on and the lights came on great i thought switched the light off and it blew the trip switch in the house any ideas please

[kbrownie]

Is the shed detached from the building if so parp p of building regs should be looked at on project pages.
Also so look on replacing a new light on projects pages useful diagram.
KB

[sparx]

Hi, you have connected the light incorrectly!
Neutral from original goes to Neutral in new light (blue).
Live from original goes to spare 'loop-in' term in light with live to switch (browns) {NB these do not connect to the light }
Switch line back from switch goes to Live term. of light. If this is blue it must be over marked at light & switch with Brown sleeveng/tape to show it is not a Neutral.
see also 'Projects, electrical-lighting'
regards sparx
BTW the fuse blew when you turned switch ON as you probably connected it directly across L&N, it may well now be welded ON and need replacing.