I have a mains socket in my garage, which has a 4-way adaptor plugged in. The adaptor has a light built into it, which is on right up until I plug something into it. In fact, it's on until the thing I plug in is turned on. Then, the item will not work, and the light is off.
The 4-way is one known to work - it does the same thing with multiple 4-ways.
The amount of current required to light a neon is very small and some imported fuses can leave a track inside them when they blow good enough to light a neon.
In fact if we consider a neon screw driver enough power is transferred into the surrounding air with your body with your finger on the end of screw driver to complete the circuit and light the neon when the other end is on a line wire.
I don’t know how your garage is supplied but if with fuses I would check them first. If a breaker then switch it off and back on again as sometimes they trip without moving exterior parts.
Hi, this just has to be a loose connection somewhere which allows enough energy through to light neon but not to provide power, this is a very real fire hazard which should be found ASAP,
It sounds to me like you still have a wylex mains board with rewireable fuses .I would recommend you badger your landlord to get an electrician round as this does not comply with bs7671,16th or 17th edition wiring regs.In the least get your landlord to have a periodic test and inspection on the property
all the best
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