Hard wiring a video doorbell.

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Wow. Been away for a while and come back with a question to find BAS has left and already been replaced.

Thanks for the guidance guys, have looked at voltage drop and think I will use 1mm t&e, the transformer has 22 awg flex and 10m of that gives too big a voltage drop (although I could fit a 20v transformer !). Intention is to put a single socket in in the garage (on the lighting circuit) with a second surface mount box beside it which will have the connection to the t&e in it away from the 240v terminals behind the socket, the t&e will then run in the eaves (not a bungalow but there is a section of tiled roof above the dining room and front door below the bedroom windows) down to the light switch in the hall and then across to a square box in the wall behind the display. The elv feed from the display to the button/camera unit is straight through the wall.
 
Intention is to put a single socket in in the garage (on the lighting circuit)

er Why? Bad practice even if it is allowed. Think what will happen when the misses puts a 4 way into it feeding a washing machine. Or you find it a bit nippy in winter and plug in a fan heater.

Surely you can get a power feed into this garage.
 
IF someone were to do that then the circuit breaker for the lights would trip. Hardly the end of the world.
 
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Generally speaking, if it is considered necessary to supply a socket from a smaller supply than usual, it is advisable to label the socket accordingly. Either with its intended purpose, or the level of current or power available, or preferably both.
 
IF someone were to do that then the circuit breaker for the lights would trip. Hardly the end of the world.

Perhaps you are not married. If I put in a new socket that took the lights out when used I would get a rollicking, especially as she considers I know what I am doing.
 
thinks that we need to be careful in case some visitor to our houses, (edit: or her indoors) crawls into the loft and plugs a MIG welder into the socket intended to power a TV signal booster.

Honestly!
As RF has said. That is exactly why a CPD, appropriate for the circuit, is selected. Lighting circuit overload, 6A breaker trips. That’s what it’s for.
 
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We are discussing a socket in a garage. It is much more likely to have a mig welder in than a loft. Also likely to have all manor of power tools.
 
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My wife isn’t much of a welder to be honest, and if she’d unplugged the doorbell, plugged the welder in and tripped the lights, it certainly wouldn’t be me that would be getting told off.
 
We already have a 13a socket on the upstairs lighting circuit (tv booster) and it has never caused a trip, probably because (1) she doesn’t go in the loft and(2) she doesn’t have a welder!

Btw split board with Hager 6 a Mcbs on the lighting circuits.

The socket will not be that easy to reach and she has other sockets which are easily reached and are on one of the rings. I did think about a 2a round pin but the wallwart won’t fit. If I put it on the ring I will also need an FCU or bigger cable which is unlikely to fit the run down to the light switch.
 

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