When I was working on energy meters, I was sent to a job to do visual check on an electric domestic meter.
The customer was concerned, the meter had started to run faster than normal, and the bill for the winter quarter had been very high last year?
When I got there, the address was in a street in Kings Lynn where the neighbours were competing with Christmas lights outdoors, "we do it for the children".
The house had lights along the eves, these ran down to the hedges around the front garden, the door was framed with lights, and a tree in the garden had lights over it.
There was an illuminated Farther christmas on the ridge near the chimney with sledge and reindeers on the lawn.
Walking into the door, it was all a bit bright but I didn't take much notice, got in and looked at the meter, and yes it was going round reasonably for a house.
I start with the questions, what have you got turned on, cooker, electric fire, immersion heater, washing machine or dryer?
Householder says no, only the TV, and a light, florescent light in the kitchen, youngster upstairs had a light on a 1 bar fire, and record player plus lights outside.
Rough estimate would be no more than 1.4 Kw for the house plus lights outside.
The meter was running much faster than that, OK best look at the lights.
The door was framed with 15 watt pygmy bulbs, the wire was 3.029 twin with earth, house wiring cable, the lamp holders were clamped onto the cable, they were a type that pierced the insulation as they were clamped on.
I ask about the rest, the out line lights, the door, hedge and tree were all the same 15 watt pygmy bulbs clamped on, I ask how many bulbs?
He didn't know other than one about every 10 inches or so.
I could not convince him that there would 2 maybe 3 Kw load in the lights plus his other display items. (66 X 15w = 1000 w roughly)
In the end I got him to turn the lights and display off, and of course the meter settled back much slower.
Turn everything off in the house and put outside on, meter ran faster than just the house alone.
Also, there was no guarantee the lamp holders were water proof, and there was 240 volts involved!
He countered with but its safe there is an earth!
Next question, where is the earth wire earthed, and on that pattern of lamp holder there are only two connection points, also what have you done at the end of the cable, it turned out to be nothing!
And the previous year it had been snowed on then it thawed!
I did not have the authority to make him turn them off, all I could do was report it as dangerous use, and recommend to him he got an isolation transformer of about 5 Kw capacity, and get an electrician to wire it in, and to turn off his homemade lights until he had got one, the bought in displays looked to be low voltage so OK.
He told me he had bought a couple of sacks full of the lamp holder's and and several boxes of coloured lamps at an auction.
I left thinking, I hope you have a happy Christmas not a tragic one.