The OP asked about a CCTV socket off a light switch, not off
a lighting circuit. Admittedly, a bit of ambiguity there. If he
means "use a light switch to turn the power socket on and
off", then, yes, it's allowable as long as the circuit is /supplied/
from a power circuit and the circuit is protected by a 5A fuse/etc
upstream from the switch.
Eg: ring main-->5A Fused Spur---->5A "light" switch--->CCTV socket
I have exactly the same arrangement in my roofspace with "cctv"
replaced with "light".
If the OP means "can I take power from a lighting circuit", the
answer is a clear "no".
Considering most lighting circuits are in 1.5mm T+E, the cable can run
13 amps continuous if it is on a plasterboard ceiling, covered by
A change from 6A to 10A CB would suffice if the 6A was likely to be
exceeded, and still gives a big margin for safety of the cable.
Apart from some heaters and other large current eaters, lighting
circuits would be quite capable of carrying a number of socket outlets
if they were marked for low wattage appliances.
It is common for extractor fans and TV boosters/Sky boxes to run from
the lighting circuit in an attic.
To reply by e-mail, change the ' + ' to 'plus'.
On Sun, 18 Nov 2012 03:39:44 -0800 (PST), firstname.lastname@example.org wrote:
The lighting fuse/MCB would then operate...
Donno what the regs say but I can't see what is wrong with a 13A socket
connected to the lighting circuit via a FCU and 3A (or smaller) fuse.
Everything suitably labled as well.
I think there still needs to be clarification from the OP of what he
means By "Is it acceptable in the uk to put a socket for a cctv camera
off of a light switch?"
Is he looking to derive a power feed from the back of a light switch
direct to a socket or use a light switch as a switch to a remote socket
fed from a ring main or lighting power?
On 18/11/2012 11:39, email@example.com wrote:
I am not aware of any specific regulation that says you can't use a 13A
socket on a circuit with a lower rating.
The main concern would be that a high load connected to it would cause
tripping of the circuit, and that in turn may pose a risk due to loss of
lighting. Hence it is required that the designer make sensible
decisions. So rigging an extra socket on your landing that is fed from
the lighting circuit would not be sensible - since someone is very
likely to plug a vacuum cleaner into it etc. However one in the loft
space intended to feed an aerial amp really poses no risk. Likewise,
socket designed for powering table lamps etc would be fine on a lighting
circuit - although in that circumstance using a physically incompatible
socket would make sense since it will be in proximity to general purpose
Cables on lighting circuits are usually fairly generously oversized, and
the cable rating is significantly in excess of the circuit breaker. So
you can't create a situation where you can overload the cable.
(a similar situation exists with a typical cooker on a 6mm^2 radial with
a 32A MCB)
Powering a low current load from a lighting circuit is acceptable and
often done for things like extractor fans etc.
You can install sockets as well, although it is preferable to use one of
the small round pin shuttered 2 or 5A ones to prevent someone connecting
high current devices to the circuit and tripping it.
However connecting to a light switch as such may be a problem since you
usually only have two live wires (one switched) and no neutral.
Unless specified by the manufacturer, there is not usually any
requirement for a fused connection unit (aka spur unit) since they
circuit will typically be protected with a MCB that has a rating well
below the current carrying capacity of the cable.
But an FCU with 3a fuse may be required (or at least desirable) for
discrimination, to protect from loss of lighting due to plugging in an
appliance of excessive rating. This is assuming that a 13a socket outlet is
used to connect teh camera supply.
On 19/11/2012 00:34, firstname.lastname@example.org wrote:
Yes its a valid argument, although its debatable if you will actually
get much discrimination with the arrangement in that order. (i.e. MCB
upline of a fuse). Also if fitting a socket to a lighting circuit it
will normally be for a specific purpose rather than a general socket, so
the chances of accidental overload should be small.
The main argument for using a FCU etc would be for connecting a bit of
fixed equipment that specifies it must be protected at 3A.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.