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Portable inverter to ceiling lights

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I know I'm not the only one doing this but I haven't been able to find a good description of what the safety issues are.

I have a portable inverter, 1 kW/1.2 kWh, and I've brought the lights circuit out of the DB, both L & N, and plugged it into the inverter. It works as expected, and I am pleased. 

I'm sure it's a code violation, uninsurable, etc. What I want to know is whether it also represents a real safety hazard in my specific situation, and how.

The lights were not on the earth leakage breaker. They are all old plastic pendant/bayonet fixtures, no fans etc. I will be the only one changing bulbs. I will be reverting this setup when we move. 

In principle, I can't see why ceiling lights could not be treated like any other self-contained appliance that could be plugged into a portable inverter.

Where is the connection or fault condition that I am not seeing that makes them unlike a freestanding appliance and that makes this unsafe? 

Edited by TTT

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