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Outdoor security light,electrical question?
My dad was trying to replace an outdoor security light which is on our shed.
The power cable comes in at the inside of the shed floor, then goes up the wall into a box with two fuses which have switches on.
One cable comes out of the fuse box to a double plug socket and the other comes out of the top to the security light outdoors.
Before he started to change the light he turned the power to the light off by the switch on the fusebox.
When he was changing the light, the houses main electricity tripped and everything went off.
There was no power coming through the wires as he tested the exposed ends with an indicating screwdriver.
Just to be doubly sure he took the fuse with the switch on out of the box but it tripped again.
How could it trip the main box if there is no power coming through?
I'm sorry if my description or electrical terminology is a bit off.
Any ideas please? Any sparks out there?
Thanks.
By removing the fuse from the light cct you have disconnected only the 'live'. He undoubtedly made a contact between neutral and 'earth' in doing the changeover.
If your main (house) switch has an RCD built-in, then that would have tripped it..
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