Is it acceptable in the uk to put a socket for a cctv camera off of a
light switch? The socket would only be a single and would be at approx
7/8 feet high. I know its possible and that the draw is very low but
more asking if its against uk regulations. Cctv power is an ac to dc
converter with standard uk plug.
IANAE, but AIUI, you have to use a fused spur. Otherwise someone
could come along and plug an electric fire or kettle into it, and fry
the lighting circuit, possibly setting fire to the house as a result.
This means that if the CCTV PSU is of the wall-wart variety, it's a
no-no - you'll have to take a spur off a ring main - but if it's
an inline unit, as with say Dell laptop PSUs, then you can cut off the
three-pin plug and wire the power lead into the fused spur outlet. Of
course, the fuse in the spur unit needs to be 3A or less.
On Sat, 17 Nov 2012 00:56:53 +0000, malcolmf
Please always reply to ng as the email in this post's
Killing the cat, sparking off a nuclear event, accellerating global
warming and throwing the western world back into the dark ages.
Most houses have circuit breakers these days you know, before that
there were fuses.
Although it may be frowned on to dangle the heating system, shower and
grandmas iron lung off the lighting circuit, I still wouldn,t think
that the purchase of a fire extinguisher would be a worthwhile
I cannot recollect what the regulations say, but bathroom fans are fed
from the lighting circuit and the loads ust be similar.
Practically as a minimum I would use a dedicated connector that
couldn't be connected to accidentally, or better still wire directly
to a fused spur. Mounted outside, the camera should from a practical
point of view be on its own circuit with an RCBO protecting it, unless
of course you enjoy hunting around for ladders, tools etc in the dark
during a thundestorm.
The best way to use coax for mains is to use the inner for line and the
outer for neutral. Don't bother about an earth. No-one bothers
connecting the earth these days. It's just a hang-over from the early
days of radio when a good earth was needed for reception. Note that
when you power your electric fire through coax you actually save on your
electricity bill because the coax gets very hot and helps warm the room.
There is no cost for this because it's the same electricity as is going
through the fire, so you get the benefit of it twice. If the small of
burning plastic bothers you just push the coax under the rug.
Well there you are then. What's good enough for Auld Reekie is good
enough for me. What was the csa of the inner, by the way? A tad more
than 1mm2 I would guess?
Of course nowadays they use coax with two inners for mains supplies...
There was indeed coax for mains. The core was live. Of the outer
conductor, half the strands were individually insulated, which were
neutrals and the the other were not, which were the earth.
Haven't seen any for forty years.
It was supposed to be safer as the live conductor was inside the
Err no. If you're getting heat out he cable it's because it has
resistance which reduces the total current through the cable/fire
Any heat gain in the cable has an equal reduction in the fire.
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